Examine source code of FxPlus+ for Firefox

{
  "manifest_version": 2,
  "name": "FxPlus+ for Firefox",
  "short_name": "FxPlus+",
  "author": "SilverTuxedo",
  "description": "מעולם לא היה קל יותר לגלוש ב-FxP.",
  "version": "1.5.5",
  "browser": "firefox",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/icon.png",
    "default_title": "פתח התראות - FxPlus+",
    "default_popup": "html/popup.html"
  },
  "options_page": "html/settings.html",
  "background": {
    "page": "html/background.html"
  },
  "permissions": [
    "https://www.fxp.co.il/*",
    "tabs",
    "storage",
    "notifications",
    "cookies",
    "alarms"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.fxp.co.il/*"
      ],
      "js": [
        "js/jquery.min.js",
        "js/utils.js",
        "js/main_fxp.js"
      ],
      "css": [
        "css/main_fxp.css",
        "css/balloon.css",
        "fonts/materialdesignicons.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.fxp.co.il/private_chat.php*"
      ],
      "js": [
        "js/jquery.min.js",
        "js/utils.js",
        "js/private_chat_fxp.js"
      ],
      "css": [
        "css/balloon.css",
        "css/main_fxp.css"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.fxp.co.il/forumdisplay.php*&web_fast_fxp=1"
      ],
      "js": [
        "js/jquery.min.js",
        "js/iframes_fxp.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "html/settings.html",
    "css/nightmode.css",
    "css/private_chat_nightmode.css",
    "css/iframes_nightmode.css",
    "images/*",
    "fonts/*",
    "js/disable_typing.js"
  ],
  "applications": {
    "gecko": {
      "id": "tuxedosilver@gmail.com"
    }
  }
}