src/content_scripts/console_inject.js - infinitegforums - Gitiles

 var mutationObserver, intersectionObserver, intersectionOptions, options,
     authuser;

 function removeChildNodes(node) {
   while (node.firstChild) {
     node.removeChild(node.firstChild);
   }
 }

 function getNParent(node, n) {
   if (n <= 0) return node;
   if (!('parentNode' in node)) return null;
   return getNParent(node.parentNode, n - 1);
 }

 function createExtBadge() {
   var badge = document.createElement('div');
   badge.classList.add('TWPT-badge');
   badge.setAttribute(
       'title', chrome.i18n.getMessage('inject_extension_badge_helper', [
         chrome.i18n.getMessage('appName')
       ]));

   var badgeI = document.createElement('i');
   badgeI.classList.add('material-icon-i', 'material-icons-extended');
   badgeI.textContent = 'repeat';

   badge.append(badgeI);
   return badge;
 }

 function addProfileHistoryLink(node, type, query) {
   var urlpart = encodeURIComponent('query=' + query);
   var authuserpart =
       (authuser == '0' ? '' : '?authuser=' + encodeURIComponent(authuser));
   var container = document.createElement('div');
   container.style.margin = '3px 0';

   var link = document.createElement('a');
   link.setAttribute(
       'href',
       'https://support.google.com/s/community/search/' + urlpart +
           authuserpart);
   link.innerText = chrome.i18n.getMessage('inject_previousposts_' + type);

   container.appendChild(link);
   node.appendChild(container);
 }

 function applyDragAndDropFix(node) {
   console.debug('Adding link drag&drop fix to ', node);
   node.addEventListener('drop', e => {
     if (e.dataTransfer.types.includes('text/uri-list')) {
       e.stopImmediatePropagation();
       console.debug('Stopping link drop event propagation.');
     }
   }, true);
 }

 function nodeIsReadToggleBtn(node) {
   return ('tagName' in node) && node.tagName == 'MATERIAL-BUTTON' &&
       node.getAttribute('debugid') !== null &&
       (node.getAttribute('debugid') == 'mark-read-button' ||
        node.getAttribute('debugid') == 'mark-unread-button') &&
       ('parentNode' in node) && node.parentNode !== null &&
       ('parentNode' in node.parentNode) &&
       node.parentNode.querySelector('[debugid="batchlock"]') === null &&
       node.parentNode.parentNode !== null &&
       ('tagName' in node.parentNode.parentNode) &&
       node.parentNode.parentNode.tagName == 'EC-BULK-ACTIONS';
 }

 function injectDarkModeButton(rightControl) {
   var darkThemeSwitch = document.createElement('material-button');
   darkThemeSwitch.classList.add('TWPT-dark-theme', 'TWPT-btn--with-badge');
   darkThemeSwitch.setAttribute('button', '');
   darkThemeSwitch.setAttribute(
       'title', chrome.i18n.getMessage('inject_ccdarktheme_helper'));

   darkThemeSwitch.addEventListener('click', e => {
     chrome.storage.sync.get(null, currentOptions => {
       currentOptions.ccdarktheme_switch_status =
           !options.ccdarktheme_switch_status;
       chrome.storage.sync.set(currentOptions, _ => {
         location.reload();
       });
     });
   });

   var switchContent = document.createElement('div');
   switchContent.classList.add('content');

   var icon = document.createElement('material-icon');

   var i = document.createElement('i');
   i.classList.add('material-icon-i', 'material-icons-extended');
   i.textContent = 'brightness_4';

   icon.appendChild(i);
   switchContent.appendChild(icon);
   darkThemeSwitch.appendChild(switchContent);

   var badgeContent = createExtBadge();

   darkThemeSwitch.appendChild(badgeContent);

   rightControl.style.width =
       (parseInt(window.getComputedStyle(rightControl).width) + 58) + 'px';
   rightControl.insertAdjacentElement('afterbegin', darkThemeSwitch);
 }

 function addBatchLockBtn(readToggle) {
   var clone = readToggle.cloneNode(true);
   clone.setAttribute('debugid', 'batchlock');
   clone.classList.add('TWPT-btn--with-badge');
   clone.setAttribute('title', chrome.i18n.getMessage('inject_lockbtn'));
   clone.querySelector('material-icon').setAttribute('icon', 'lock');
   clone.querySelector('i.material-icon-i').textContent = 'lock';

   var badge = createExtBadge();
   clone.append(badge);

   clone.addEventListener('click', function() {
     var modal = document.querySelector('.pane[pane-id="default-1"]');

     var dialog = document.createElement('material-dialog');
     dialog.setAttribute('role', 'dialog');
     dialog.setAttribute('aria-modal', 'true');
     dialog.classList.add('TWPT-dialog');

     var header = document.createElement('header');
     header.setAttribute('role', 'presentation');
     header.classList.add('TWPT-dialog-header');

     var title = document.createElement('div');
     title.classList.add('TWPT-dialog-header--title', 'title');
     title.textContent = chrome.i18n.getMessage('inject_lockbtn');

     header.append(title);

     var main = document.createElement('main');
     main.setAttribute('role', 'presentation');
     main.classList.add('TWPT-dialog-main');

     var p = document.createElement('p');
     p.textContent = chrome.i18n.getMessage('inject_lockdialog_desc');

     main.append(p);

     dialog.append(header, main);

     var footers = [['lock', 'unlock', 'cancel'], ['reload', 'close']];

     for (var i = 0; i < footers.length; ++i) {
       var footer = document.createElement('footer');
       footer.setAttribute('role', 'presentation');
       footer.classList.add('TWPT-dialog-footer');
       footer.setAttribute('data-footer-id', i);

       if (i > 0) footer.classList.add('is-hidden');

       footers[i].forEach(action => {
         var btn = document.createElement('material-button');
         btn.setAttribute('role', 'button');
         btn.classList.add('TWPT-dialog-footer-btn');
         if (i == 1) btn.classList.add('is-disabled');

         switch (action) {
           case 'lock':
           case 'unlock':
             btn.addEventListener('click', _ => {
               if (btn.classList.contains('is-disabled')) return;
               var message = {
                 action,
                 prefix: 'TWPT-batchlock',
               };
               window.postMessage(message, '*');
             });
             break;

           case 'cancel':
           case 'close':
             btn.addEventListener('click', _ => {
               if (btn.classList.contains('is-disabled')) return;
               modal.classList.remove('visible');
               modal.style.display = 'none';
               removeChildNodes(modal);
             });
             break;

           case 'reload':
             btn.addEventListener('click', _ => {
               if (btn.classList.contains('is-disabled')) return;
               window.location.reload()
             });
             break;
         }

         var content = document.createElement('div');
         content.classList.add('content', 'TWPT-dialog-footer-btn--content');
         content.textContent =
             chrome.i18n.getMessage('inject_lockdialog_btn_' + action);

         btn.append(content);
         footer.append(btn);
       });

       var clear = document.createElement('div');
       clear.style.clear = 'both';

       footer.append(clear);
       dialog.append(footer);
     }

     removeChildNodes(modal);
     modal.append(dialog);
     modal.classList.add('visible', 'modal');
     modal.style.display = 'flex';
   });
   readToggle.parentNode.insertBefore(
       clone, (readToggle.nextSibling || readToggle));
 }

 function injectPreviousPostsLinks(nameElement) {
   var mainCardContent = getNParent(nameElement, 3);
   if (mainCardContent === null) {
     console.error(
         '[previousposts] Couldn\'t find |.main-card-content| element.');
     return;
   }

   var forumId = location.href.split('/forum/')[1].split('/')[0] || '0';

   var name = escapeUsername(nameElement.textContent);
   var query1 = encodeURIComponent(
       '(creator:"' + name + '" | replier:"' + name + '") forum:' + forumId);
   var query2 = encodeURIComponent(
       '(creator:"' + name + '" | replier:"' + name + '") forum:any');

   var container = document.createElement('div');
   container.classList.add('TWPT-previous-posts');

   var badge = createExtBadge();
   container.appendChild(badge);

   var linkContainer = document.createElement('div');
   linkContainer.classList.add('TWPT-previous-posts--links');

   addProfileHistoryLink(linkContainer, 'forum', query1);
   addProfileHistoryLink(linkContainer, 'all', query2);

   container.appendChild(linkContainer);

   mainCardContent.appendChild(container);
 }

 const watchedNodesSelectors = [
   // App container (used to set up the intersection observer and inject the dark
   // mode button)
   'ec-app',

   // Load more bar (for the "load more"/"load all" buttons)
   '.load-more-bar',

   // Username span inside ec-user (user profile view)
   'ec-user .main-card .header > .name > span',

   // Rich text editor
   'ec-movable-dialog',
   'ec-rich-text-editor',

   // Read/unread bulk action in the list of thread, for the batch lock feature
   'ec-bulk-actions material-button[debugid="mark-read-button"]',
   'ec-bulk-actions material-button[debugid="mark-unread-button"]',
 ];

 function handleCandidateNode(node) {
   if (typeof node.classList !== 'undefined') {
     if (('tagName' in node) && node.tagName == 'EC-APP') {
       // Set up the intersectionObserver
       if (typeof intersectionObserver === 'undefined') {
         var scrollableContent = node.querySelector('.scrollable-content');
         if (scrollableContent !== null) {
           intersectionOptions = {
             root: scrollableContent,
             rootMargin: '0px',
             threshold: 1.0,
           };

           intersectionObserver = new IntersectionObserver(
               intersectionCallback, intersectionOptions);
         }
       }

       // Inject the dark mode button
       if (options.ccdarktheme && options.ccdarktheme_mode == 'switch') {
         var rightControl = node.querySelector('header .right-control');
         if (rightControl !== null) injectDarkModeButton(rightControl);
       }
     }

     // Start the intersectionObserver for the "load more"/"load all" buttons
     // inside a thread
     if ((options.thread || options.threadall) &&
         node.classList.contains('load-more-bar')) {
       if (typeof intersectionObserver !== 'undefined') {
         if (options.thread)
           intersectionObserver.observe(node.querySelector('.load-more-button'));
         if (options.threadall)
           intersectionObserver.observe(node.querySelector('.load-all-button'));
       } else {
         console.warn(
             '[infinitescroll] ' +
             'The intersectionObserver is not ready yet.');
       }
     }

     // Show the "previous posts" links
     //   Here we're selecting the 'ec-user > div' element (unique child)
     if (options.history &&
         node.matches('ec-user .main-card .header > .name > span')) {
       injectPreviousPostsLinks(node);
     }

     // Fix the drag&drop issue with the rich text editor
     //
     //   We target both tags because in different contexts different
     //   elements containing the text editor get added to the DOM structure.
     //   Sometimes it's a EC-MOVABLE-DIALOG which already contains the
     //   EC-RICH-TEXT-EDITOR, and sometimes it's the EC-RICH-TEXT-EDITOR
     //   directly.
     if (options.ccdragndropfix && ('tagName' in node) &&
         (node.tagName == 'EC-MOVABLE-DIALOG' ||
          node.tagName == 'EC-RICH-TEXT-EDITOR')) {
       applyDragAndDropFix(node);
     }

     // Inject the batch lock button in the thread list
     if (options.batchlock && nodeIsReadToggleBtn(node)) {
       addBatchLockBtn(node);
     }
   }
 }

 function mutationCallback(mutationList, observer) {
   mutationList.forEach((mutation) => {
     if (mutation.type == 'childList') {
       mutation.addedNodes.forEach(function(node) {
         handleCandidateNode(node);
       });
     }
   });
 }

 function intersectionCallback(entries, observer) {
   entries.forEach(entry => {
     if (entry.isIntersecting) {
       entry.target.click();
     }
   });
 };

 var observerOptions = {
   childList: true,
   subtree: true,
 };

 chrome.storage.sync.get(null, function(items) {
   options = items;

   var startup =
       JSON.parse(document.querySelector('html').getAttribute('data-startup'));
   authuser = startup[2][1] || '0';

   // Before starting the mutation Observer, check whether we missed any
   // mutations by manually checking whether some watched nodes already
   // exist.
   var cssSelectors = watchedNodesSelectors.join(',');
   document.querySelectorAll(cssSelectors)
       .forEach(node => handleCandidateNode(node));

   mutationObserver = new MutationObserver(mutationCallback);
   mutationObserver.observe(document.body, observerOptions);

   if (options.fixedtoolbar) {
     injectStyles(
         'ec-bulk-actions{position: sticky; top: 0; background: var(--TWPT-primary-background, #fff); z-index: 96;}');
   }

   if (options.increasecontrast) {
     injectStyles(
         '.thread-summary.read:not(.checked){background: var(--TWPT-thread-read-background, #ecedee)!important;}');
   }

   if (options.stickysidebarheaders) {
     injectStyles(
         'material-drawer .main-header{background: var(--TWPT-drawer-background, #fff)!important; position: sticky; top: 0; z-index: 1;}');
   }

   if (options.enhancedannouncementsdot) {
     injectStylesheet(
         chrome.runtime.getURL('injections/enhanced_announcements_dot.css'));
   }

   if (options.ccforcehidedrawer) {
     var drawer = document.querySelector('material-drawer');
     if (drawer !== null && drawer.classList.contains('mat-drawer-expanded')) {
       document.querySelector('.material-drawer-button').click();
     }
   }

   if (options.batchlock) {
     injectScript(chrome.runtime.getURL('injections/batchlock_inject.js'));
   }
 });
	var mutationObserver, intersectionObserver, intersectionOptions, options,
	authuser;

	function removeChildNodes(node) {
	while (node.firstChild) {
	node.removeChild(node.firstChild);
	}
	}

	function getNParent(node, n) {
	if (n <= 0) return node;
	if (!('parentNode' in node)) return null;
	return getNParent(node.parentNode, n - 1);
	}

	function createExtBadge() {
	var badge = document.createElement('div');
	badge.classList.add('TWPT-badge');
	badge.setAttribute(
	'title', chrome.i18n.getMessage('inject_extension_badge_helper', [
	chrome.i18n.getMessage('appName')
	]));

	var badgeI = document.createElement('i');
	badgeI.classList.add('material-icon-i', 'material-icons-extended');
	badgeI.textContent = 'repeat';

	badge.append(badgeI);
	return badge;
	}

	function addProfileHistoryLink(node, type, query) {
	var urlpart = encodeURIComponent('query=' + query);
	var authuserpart =
	(authuser == '0' ? '' : '?authuser=' + encodeURIComponent(authuser));
	var container = document.createElement('div');
	container.style.margin = '3px 0';

	var link = document.createElement('a');
	link.setAttribute(
	'href',
	'https://support.google.com/s/community/search/' + urlpart +
	authuserpart);
	link.innerText = chrome.i18n.getMessage('inject_previousposts_' + type);

	container.appendChild(link);
	node.appendChild(container);
	}

	function applyDragAndDropFix(node) {
	console.debug('Adding link drag&drop fix to ', node);
	node.addEventListener('drop', e => {
	if (e.dataTransfer.types.includes('text/uri-list')) {
	e.stopImmediatePropagation();
	console.debug('Stopping link drop event propagation.');
	}
	}, true);
	}

	function nodeIsReadToggleBtn(node) {
	return ('tagName' in node) && node.tagName == 'MATERIAL-BUTTON' &&
	node.getAttribute('debugid') !== null &&
	(node.getAttribute('debugid') == 'mark-read-button' \|\|
	node.getAttribute('debugid') == 'mark-unread-button') &&
	('parentNode' in node) && node.parentNode !== null &&
	('parentNode' in node.parentNode) &&
	node.parentNode.querySelector('[debugid="batchlock"]') === null &&
	node.parentNode.parentNode !== null &&
	('tagName' in node.parentNode.parentNode) &&
	node.parentNode.parentNode.tagName == 'EC-BULK-ACTIONS';
	}

	function injectDarkModeButton(rightControl) {
	var darkThemeSwitch = document.createElement('material-button');
	darkThemeSwitch.classList.add('TWPT-dark-theme', 'TWPT-btn--with-badge');
	darkThemeSwitch.setAttribute('button', '');
	darkThemeSwitch.setAttribute(
	'title', chrome.i18n.getMessage('inject_ccdarktheme_helper'));

	darkThemeSwitch.addEventListener('click', e => {
	chrome.storage.sync.get(null, currentOptions => {
	currentOptions.ccdarktheme_switch_status =
	!options.ccdarktheme_switch_status;
	chrome.storage.sync.set(currentOptions, _ => {
	location.reload();
	});
	});
	});

	var switchContent = document.createElement('div');
	switchContent.classList.add('content');

	var icon = document.createElement('material-icon');

	var i = document.createElement('i');
	i.classList.add('material-icon-i', 'material-icons-extended');
	i.textContent = 'brightness_4';

	icon.appendChild(i);
	switchContent.appendChild(icon);
	darkThemeSwitch.appendChild(switchContent);

	var badgeContent = createExtBadge();

	darkThemeSwitch.appendChild(badgeContent);

	rightControl.style.width =
	(parseInt(window.getComputedStyle(rightControl).width) + 58) + 'px';
	rightControl.insertAdjacentElement('afterbegin', darkThemeSwitch);
	}

	function addBatchLockBtn(readToggle) {
	var clone = readToggle.cloneNode(true);
	clone.setAttribute('debugid', 'batchlock');
	clone.classList.add('TWPT-btn--with-badge');
	clone.setAttribute('title', chrome.i18n.getMessage('inject_lockbtn'));
	clone.querySelector('material-icon').setAttribute('icon', 'lock');
	clone.querySelector('i.material-icon-i').textContent = 'lock';

	var badge = createExtBadge();
	clone.append(badge);

	clone.addEventListener('click', function() {
	var modal = document.querySelector('.pane[pane-id="default-1"]');

	var dialog = document.createElement('material-dialog');
	dialog.setAttribute('role', 'dialog');
	dialog.setAttribute('aria-modal', 'true');
	dialog.classList.add('TWPT-dialog');

	var header = document.createElement('header');
	header.setAttribute('role', 'presentation');
	header.classList.add('TWPT-dialog-header');

	var title = document.createElement('div');
	title.classList.add('TWPT-dialog-header--title', 'title');
	title.textContent = chrome.i18n.getMessage('inject_lockbtn');

	header.append(title);

	var main = document.createElement('main');
	main.setAttribute('role', 'presentation');
	main.classList.add('TWPT-dialog-main');

	var p = document.createElement('p');
	p.textContent = chrome.i18n.getMessage('inject_lockdialog_desc');

	main.append(p);

	dialog.append(header, main);

	var footers = [['lock', 'unlock', 'cancel'], ['reload', 'close']];

	for (var i = 0; i < footers.length; ++i) {
	var footer = document.createElement('footer');
	footer.setAttribute('role', 'presentation');
	footer.classList.add('TWPT-dialog-footer');
	footer.setAttribute('data-footer-id', i);

	if (i > 0) footer.classList.add('is-hidden');

	footers[i].forEach(action => {
	var btn = document.createElement('material-button');
	btn.setAttribute('role', 'button');
	btn.classList.add('TWPT-dialog-footer-btn');
	if (i == 1) btn.classList.add('is-disabled');

	switch (action) {
	case 'lock':
	case 'unlock':
	btn.addEventListener('click', _ => {
	if (btn.classList.contains('is-disabled')) return;
	var message = {
	action,
	prefix: 'TWPT-batchlock',
	};
	window.postMessage(message, '*');
	});
	break;

	case 'cancel':
	case 'close':
	btn.addEventListener('click', _ => {
	if (btn.classList.contains('is-disabled')) return;
	modal.classList.remove('visible');
	modal.style.display = 'none';
	removeChildNodes(modal);
	});
	break;

	case 'reload':
	btn.addEventListener('click', _ => {
	if (btn.classList.contains('is-disabled')) return;
	window.location.reload()
	});
	break;
	}

	var content = document.createElement('div');
	content.classList.add('content', 'TWPT-dialog-footer-btn--content');
	content.textContent =
	chrome.i18n.getMessage('inject_lockdialog_btn_' + action);

	btn.append(content);
	footer.append(btn);
	});

	var clear = document.createElement('div');
	clear.style.clear = 'both';

	footer.append(clear);
	dialog.append(footer);
	}

	removeChildNodes(modal);
	modal.append(dialog);
	modal.classList.add('visible', 'modal');
	modal.style.display = 'flex';
	});
	readToggle.parentNode.insertBefore(
	clone, (readToggle.nextSibling \|\| readToggle));
	}

	function injectPreviousPostsLinks(nameElement) {
	var mainCardContent = getNParent(nameElement, 3);
	if (mainCardContent === null) {
	console.error(
	'[previousposts] Couldn\'t find \|.main-card-content\| element.');
	return;
	}

	var forumId = location.href.split('/forum/')[1].split('/')[0] \|\| '0';

	var name = escapeUsername(nameElement.textContent);
	var query1 = encodeURIComponent(
	'(creator:"' + name + '" \| replier:"' + name + '") forum:' + forumId);
	var query2 = encodeURIComponent(
	'(creator:"' + name + '" \| replier:"' + name + '") forum:any');

	var container = document.createElement('div');
	container.classList.add('TWPT-previous-posts');

	var badge = createExtBadge();
	container.appendChild(badge);

	var linkContainer = document.createElement('div');
	linkContainer.classList.add('TWPT-previous-posts--links');

	addProfileHistoryLink(linkContainer, 'forum', query1);
	addProfileHistoryLink(linkContainer, 'all', query2);

	container.appendChild(linkContainer);

	mainCardContent.appendChild(container);
	}

	const watchedNodesSelectors = [
	// App container (used to set up the intersection observer and inject the dark
	// mode button)
	'ec-app',

	// Load more bar (for the "load more"/"load all" buttons)
	'.load-more-bar',

	// Username span inside ec-user (user profile view)
	'ec-user .main-card .header > .name > span',

	// Rich text editor
	'ec-movable-dialog',
	'ec-rich-text-editor',

	// Read/unread bulk action in the list of thread, for the batch lock feature
	'ec-bulk-actions material-button[debugid="mark-read-button"]',
	'ec-bulk-actions material-button[debugid="mark-unread-button"]',
	];

	function handleCandidateNode(node) {
	if (typeof node.classList !== 'undefined') {
	if (('tagName' in node) && node.tagName == 'EC-APP') {
	// Set up the intersectionObserver
	if (typeof intersectionObserver === 'undefined') {
	var scrollableContent = node.querySelector('.scrollable-content');
	if (scrollableContent !== null) {
	intersectionOptions = {
	root: scrollableContent,
	rootMargin: '0px',
	threshold: 1.0,
	};

	intersectionObserver = new IntersectionObserver(
	intersectionCallback, intersectionOptions);
	}
	}

	// Inject the dark mode button
	if (options.ccdarktheme && options.ccdarktheme_mode == 'switch') {
	var rightControl = node.querySelector('header .right-control');
	if (rightControl !== null) injectDarkModeButton(rightControl);
	}
	}

	// Start the intersectionObserver for the "load more"/"load all" buttons
	// inside a thread
	if ((options.thread \|\| options.threadall) &&
	node.classList.contains('load-more-bar')) {
	if (typeof intersectionObserver !== 'undefined') {
	if (options.thread)
	intersectionObserver.observe(node.querySelector('.load-more-button'));
	if (options.threadall)
	intersectionObserver.observe(node.querySelector('.load-all-button'));
	} else {
	console.warn(
	'[infinitescroll] ' +
	'The intersectionObserver is not ready yet.');
	}
	}

	// Show the "previous posts" links
	// Here we're selecting the 'ec-user > div' element (unique child)
	if (options.history &&
	node.matches('ec-user .main-card .header > .name > span')) {
	injectPreviousPostsLinks(node);
	}

	// Fix the drag&drop issue with the rich text editor
	//
	// We target both tags because in different contexts different
	// elements containing the text editor get added to the DOM structure.
	// Sometimes it's a EC-MOVABLE-DIALOG which already contains the
	// EC-RICH-TEXT-EDITOR, and sometimes it's the EC-RICH-TEXT-EDITOR
	// directly.
	if (options.ccdragndropfix && ('tagName' in node) &&
	(node.tagName == 'EC-MOVABLE-DIALOG' \|\|
	node.tagName == 'EC-RICH-TEXT-EDITOR')) {
	applyDragAndDropFix(node);
	}

	// Inject the batch lock button in the thread list
	if (options.batchlock && nodeIsReadToggleBtn(node)) {
	addBatchLockBtn(node);
	}
	}
	}

	function mutationCallback(mutationList, observer) {
	mutationList.forEach((mutation) => {
	if (mutation.type == 'childList') {
	mutation.addedNodes.forEach(function(node) {
	handleCandidateNode(node);
	});
	}
	});
	}

	function intersectionCallback(entries, observer) {
	entries.forEach(entry => {
	if (entry.isIntersecting) {
	entry.target.click();
	}
	});
	};

	var observerOptions = {
	childList: true,
	subtree: true,
	};

	chrome.storage.sync.get(null, function(items) {
	options = items;

	var startup =
	JSON.parse(document.querySelector('html').getAttribute('data-startup'));
	authuser = startup[2][1] \|\| '0';

	// Before starting the mutation Observer, check whether we missed any
	// mutations by manually checking whether some watched nodes already
	// exist.
	var cssSelectors = watchedNodesSelectors.join(',');
	document.querySelectorAll(cssSelectors)
	.forEach(node => handleCandidateNode(node));

	mutationObserver = new MutationObserver(mutationCallback);
	mutationObserver.observe(document.body, observerOptions);

	if (options.fixedtoolbar) {
	injectStyles(
	'ec-bulk-actions{position: sticky; top: 0; background: var(--TWPT-primary-background, #fff); z-index: 96;}');
	}

	if (options.increasecontrast) {
	injectStyles(
	'.thread-summary.read:not(.checked){background: var(--TWPT-thread-read-background, #ecedee)!important;}');
	}

	if (options.stickysidebarheaders) {
	injectStyles(
	'material-drawer .main-header{background: var(--TWPT-drawer-background, #fff)!important; position: sticky; top: 0; z-index: 1;}');
	}

	if (options.enhancedannouncementsdot) {
	injectStylesheet(
	chrome.runtime.getURL('injections/enhanced_announcements_dot.css'));
	}

	if (options.ccforcehidedrawer) {
	var drawer = document.querySelector('material-drawer');
	if (drawer !== null && drawer.classList.contains('mat-drawer-expanded')) {
	document.querySelector('.material-drawer-button').click();
	}
	}

	if (options.batchlock) {
	injectScript(chrome.runtime.getURL('injections/batchlock_inject.js'));
	}
	});