Examine source code of Link for All

{
  "manifest_version": 2,
  "name": "Link for All",
  "description": "This addon Will provide lin for all popular sites",
  "version": "1.0",
  "icons": {
    "128": "logo_128.png"
  },
  "browser_action": {
    "default_icon": "logo.png",
    "default_popup": "index.html"
  },
  "permissions": [
    "activeTab"
  ]
}