diff --git a/src/console_profileindicator_inject.js b/src/console_profileindicator_inject.js
new file mode 100644
index 0000000..29ff70d
--- /dev/null
+++ b/src/console_profileindicator_inject.js
@@ -0,0 +1,173 @@
+var profileRegex =
+    /^(?:https:\/\/support\.google\.com)?\/s\/community\/forum\/[0-9]*\/user\/(?:[0-9]+)$/;
+
+const OP_FIRST_POST = 0;
+const OP_OTHER_POSTS_READ = 1;
+const OP_OTHER_POSTS_UNREAD = 2;
+
+const OPClasses = {
+  0: 'profile-indicator--first-post',
+  1: 'profile-indicator--other-posts-read',
+  2: 'profile-indicator--other-posts-unread',
+};
+
+const OPi18n = {
+  0: 'first_post',
+  1: 'other_posts_read',
+  2: 'other_posts_unread',
+};
+
+// Filter used as a workaround to speed up the ViewForum request.
+const FILTER_ALL_LANGUAGES =
+    'lang:(ar | bg | ca | "zh-hk" | "zh-cn" | "zh-tw" | hr | cs | da | nl | en | "en-au" | "en-gb" | et | fil | fi | fr | de | el | iw | hi | hu | id | it | ja | ko | lv | lt | ms | no | pl | "pt-br" | "pt-pt" | ro | ru | sr | sk | sl | es | "es-419" | sv | th | tr | uk | vi)';
+
+function isElementInside(element, outerTag) {
+  while (element !== null && ('tagName' in element)) {
+    if (element.tagName == outerTag) return true;
+    element = element.parentNode;
+  }
+
+  return false;
+}
+
+function escapeUsername(username) {
+  var quoteRegex = /"/g;
+  var commentRegex = /<!---->/g;
+  return username.replace(quoteRegex, '\\"').replace(commentRegex, '');
+}
+
+function getPosts(query, forumId) {
+  return fetch('https://support.google.com/s/community/api/ViewForum', {
+           'credentials': 'include',
+           'headers': {'content-type': 'text/plain; charset=utf-8'},
+           'body': JSON.stringify({
+             '1': forumId,
+             '2': {
+               '1': {
+                 '2': 5,
+               },
+               '2': {
+                 '1': 1,
+                 '2': true,
+               },
+               '12': query,
+             },
+           }),
+           'method': 'POST',
+           'mode': 'cors',
+         })
+      .then(res => res.json());
+}
+
+// Source:
+// https://stackoverflow.com/questions/33063774/communication-from-an-injected-script-to-the-content-script-with-a-response
+var i18nRequest = (function() {
+  var requestId = 0;
+
+  function getMessage(msg) {
+    var id = requestId++;
+
+    return new Promise(function(resolve, reject) {
+      var listener = function(evt) {
+        if (evt.detail.requestId == id) {
+          // Deregister self
+          window.removeEventListener('sendChromeData', listener);
+          resolve(evt.detail.string);
+        }
+      };
+
+      window.addEventListener('sendi18nString', listener);
+
+      var payload = {msg: msg, id: id};
+
+      window.dispatchEvent(new CustomEvent('geti18nString', {detail: payload}));
+    });
+  }
+
+  return {getMessage: getMessage};
+})();
+
+function mutationCallback(mutationList, observer) {
+  mutationList.forEach((mutation) => {
+    if (mutation.type == 'childList') {
+      mutation.addedNodes.forEach(function(node) {
+        if (node.tagName == 'A' && ('href' in node) &&
+            profileRegex.test(node.href) &&
+            isElementInside(node, 'EC-QUESTION') && ('children' in node) &&
+            node.children.length == 0) {
+          var escapedUsername = escapeUsername(node.innerHTML);
+
+          // Create profile indicator dot with a loading state
+          var dotContainer = document.createElement('span');
+          dotContainer.classList.add('profile-indicator');
+          dotContainer.classList.add('profile-indicator--loading');
+          i18nRequest.getMessage('inject_profileindicator_loading')
+              .then(string => dotContainer.setAttribute('title', string));
+
+          var forumUrlSplit = document.location.href.split('/forum/');
+          if (forumUrlSplit.length < 2) throw new Error('Can\'t get forum id.');
+
+          var forumId = forumUrlSplit[1].split('/')[0];
+          var query = '(replier:"' + escapedUsername + '" | creator:"' +
+              escapedUsername + '") ' + FILTER_ALL_LANGUAGES;
+          var encodedQuery = encodeURIComponent(query);
+          var urlpart = encodeURIComponent('query=' + encodedQuery);
+          var dotLink = document.createElement('a');
+          dotLink.href =
+              'https://support.google.com/s/community/search/' + urlpart;
+          dotLink.innerText = '●';
+
+          dotContainer.appendChild(dotLink);
+          node.parentNode.appendChild(dotContainer);
+
+          // Query threads in order to see what state the indicator should be in
+          getPosts(query, forumId)
+              .then(res => {
+                if (!('1' in res) || !('2' in res['1'])) {
+                  throw new Error('Unexpected response.');
+                  return;
+                }
+
+                // Current thread ID
+                var threadUrlSplit = document.location.href.split('/thread/');
+                if (threadUrlSplit.length < 2)
+                  throw new Error('Can\'t get thread id.');
+
+                var currId = threadUrlSplit[1].split('/')[0];
+
+                var OPStatus = OP_FIRST_POST;
+
+                for (const thread of res['1']['2']) {
+                  var id = thread['2']['1']['1'] || undefined;
+                  if (id === undefined || id == currId) continue;
+
+                  var isRead = thread['6'] || false;
+                  if (isRead)
+                    OPStatus = Math.max(OP_OTHER_POSTS_READ, OPStatus);
+                  else
+                    OPStatus = Math.max(OP_OTHER_POSTS_UNREAD, OPStatus);
+                }
+
+                dotContainer.classList.remove('profile-indicator--loading');
+                dotContainer.classList.add(OPClasses[OPStatus]);
+                i18nRequest
+                    .getMessage('inject_profileindicator_' + OPi18n[OPStatus])
+                    .then(string => dotContainer.setAttribute('title', string));
+              })
+              .catch(
+                  err => console.error(
+                      'Unexpected error. Couldn\'t load recent posts.', err));
+        }
+      });
+    }
+  });
+};
+
+var observerOptions = {
+  childList: true,
+  subtree: true,
+}
+
+mutationObserver = new MutationObserver(mutationCallback);
+mutationObserver.observe(
+    document.querySelector('.scrollable-content'), observerOptions);