Examine source code of URL Shortener Plus

{
  "manifest_version": 2,
  "name": "__MSG_chrome_extension_name__",
  "description": "__MSG_chrome_extension_description__",
  "version": "5.7",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "oinkandstuffurlshortenerplus@gmail.com"
    }
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "__MSG_chrome_extension_name__",
    "default_icon": {
      "19": "img/icon_19.png",
      "38": "img/icon_38.png"
    },
    "default_popup": "popup.html"
  },
  "background": {
    "page": "background.html"
  },
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "permissions": [
    "notifications",
    "<all_urls>",
    "contextMenus",
    "unlimitedStorage",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "tabs"
  ],
  "web_accessible_resources": [
    "img/*",
    "js/*",
    "onInstalled/*",
    "options/*",
    "css/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}