Examine source code of Switch Off

{
  "name": "__MSG_extension_name__",
  "description": "__MSG_extension_desc__",
  "manifest_version": 2,
  "version": "1.5",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "switch.off.addon@gmail.com",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "48": "switchoff_logo.svg",
    "96": "switchoff_logo.svg"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "switchoff_logo.svg",
      "32": "switchoff_logo.svg"
    },
    "default_title": "__MSG_extension_desc__"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "alarms",
    "<all_urls>"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "selectbrowserobject.js",
      "background.js"
    ]
  }
}