Examine source code of FreshRSS Watcher

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "name": "FreshRSS Watcher",
  "description": "__MSG_extensionDescription__",
  "version": "0.3resigned1",
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {
    "default_icon": "icons/error.svg",
    "default_title": "FreshRSS Watcher"
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "alarms",
    "storage",
    "notifications",
    "sessions"
  ],
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "48": "icons/freshrss.svg",
    "96": "icons/freshrss.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8276b2b6-a974-4254-8647-79c691694b10}"
    }
  }
}