Examine source code of A7++

{
  "manifest_version": 2,
  "name": "A7++",
  "version": "2.3.9",
  "description": "__MSG_A7pp_extensionDescription__",
  "author": "Accênt, HitOrRun, Retrojex & Mmoi",
  "homepage_url": "https://github.com/A7plusplus/A7plusplus",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "options_ui": {
    "page": "settings/options.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "data/JS/A7Init.js",
    "data/JS/Accessors.js",
    "data/JS/CommentEvents.js",
    "data/JS/Extra.js",
    "data/JS/HTMLCreation.js",
    "data/JS/InitFunctions.js",
    "data/JS/Localization.js",
    "data/JS/Settings.js",
    "data/JS/TextEvents.js",
    "data/JS/TimeEvents.js",
    "data/JS/UpdateEvents.js",
    "data/JS/UserBarEvents.js",
    "data/JS/VideoBarEvents.js",
    "data/JS/UtilsFunctions.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://www.addic7ed.com/list.php*",
        "https://www.addic7ed.com/list.php*"
      ],
      "css": [
        "data/CSS/Global.css",
        "data/CSS/OpenedLines.css",
        "data/CSS/Comments.css",
        "data/CSS/UserBar.css",
        "data/CSS/VideoBar.css",
        "data/CSS/Misc.css"
      ],
      "js": [
        "data/launcher.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "http://www.addic7ed.com/translate.php*",
        "https://www.addic7ed.com/translate.php*"
      ],
      "css": [
        "data/CSS/Global.css",
        "data/CSS/OpenedLines.css",
        "data/CSS/Comments.css",
        "data/CSS/UserBar.css",
        "data/CSS/VideoBar.css",
        "data/CSS/Translate.css",
        "data/CSS/Misc.css"
      ],
      "js": [
        "data/launcher.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "http://localhost/*"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-N3EAbCzqUAZiKw@jetpack"
    }
  }
}