Examine source code of RPThreadTracker QuickAdd

{
  "manifest_version": 2,
  "name": "RPThreadTracker QuickAdd",
  "description": "This extension allows you to add any Tumblr thread to your RPThreadTracker account.",
  "version": "0.6resigned1",
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "page_action": {
    "default_icon": "icon.png",
    "default_title": "RPThreadTracker QuickAdd"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2ddc802a-c21a-4094-a975-65dc3ff6abdb}"
    }
  }
}