diff --git a/src/common/contentScriptsUtils.js b/src/common/contentScriptsUtils.js
index cb7a67d..51257c0 100644
--- a/src/common/contentScriptsUtils.js
+++ b/src/common/contentScriptsUtils.js
@@ -10,8 +10,12 @@
   injectStylesheet('data:text/css;charset=UTF-8,' + encodeURIComponent(css));
 }
 
-export function injectScript(scriptName) {
+export function injectScript(scriptName, prepend = false) {
   var script = document.createElement('script');
   script.src = scriptName;
-  (document.head || document.documentElement).append(script);
+  const root = (document.head || document.documentElement);
+  if (prepend)
+    root.prepend(script);
+  else
+    root.append(script);
 }
diff --git a/src/common/xhrInterceptorUtils.js b/src/common/xhrInterceptorUtils.js
deleted file mode 100644
index 526296c..0000000
--- a/src/common/xhrInterceptorUtils.js
+++ /dev/null
@@ -1,49 +0,0 @@
-import {correctArrayKeys} from '../common/protojs';
-
-import xhrInterceptors from './xhrInterceptors.json5';
-
-export {xhrInterceptors};
-
-export function matchInterceptors(interceptFilter, url) {
-  return xhrInterceptors.interceptors.filter(interceptor => {
-    var regex = new RegExp(interceptor.urlRegex);
-    return interceptor.intercepts == interceptFilter && regex.test(url);
-  });
-}
-
-export function getResponseJSON(xhr) {
-  let response;
-  if (xhr.responseType === 'arraybuffer') {
-    var arrBuffer = xhr.response;
-    if (!arrBuffer) {
-      console.error('No array buffer.');
-      return undefined;
-    }
-    let byteArray = new Uint8Array(arrBuffer);
-    let dec = new TextDecoder('utf-8');
-    let rawResponse = dec.decode(byteArray);
-    response = JSON.parse(rawResponse);
-  } else if (xhr.responseType === 'text' || xhr.responseType === '') {
-    response = JSON.parse(xhr.responseText);
-  } else if (xhr.responseType === 'json') {
-    response = xhr.response;
-  } else {
-    console.error(
-        'Unexpected responseType ' + xhr.responseType + '. Request url: ',
-        xhr.$TWPTRequestURL);
-    return undefined;
-  }
-
-  if (xhr.$isArrayProto) response = correctArrayKeys(response);
-  return response;
-}
-
-export function triggerEvent(eventName, body, id) {
-  var evt = new CustomEvent('TWPT_' + eventName, {
-    detail: {
-      body,
-      id,
-    }
-  });
-  window.dispatchEvent(evt);
-}
diff --git a/src/common/xhrInterceptors.json5 b/src/common/xhrInterceptors.json5
deleted file mode 100644
index 2a0ea6b..0000000
--- a/src/common/xhrInterceptors.json5
+++ /dev/null
@@ -1,34 +0,0 @@
-{
-  interceptors: [
-    {
-      eventName: "ViewForumRequest",
-      urlRegex: "api/ViewForum",
-      intercepts: "request",
-    },
-    {
-      eventName: "ViewForumResponse",
-      urlRegex: "api/ViewForum",
-      intercepts: "response",
-    },
-    {
-      eventName: "CreateMessageRequest",
-      urlRegex: "api/CreateMessage",
-      intercepts: "request",
-    },
-    {
-      eventName: "ViewUnifiedUserResponse",
-      urlRegex: "api/ViewUnifiedUser",
-      intercepts: "response",
-    },
-    {
-      eventName: "ListCannedResponsesResponse",
-      urlRegex: "api/ListCannedResponses",
-      intercepts: "response",
-    },
-    {
-      eventName: "ViewThreadResponse",
-      urlRegex: "api/ViewThread",
-      intercepts: "response",
-    },
-  ],
-}