Examine source code of Magic Cursors

{
  "manifest_version": 2,
  "name": "Magic Cursors",
  "description": "Magic Cursors - Custom Cursor for Firefox",
  "version": "3.0",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_title": "Change My Cursor!",
    "default_icon": "icon16.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png"
  },
  "web_accessible_resources": [
    "img/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f29833ad-b77f-4bb0-b6e0-c278fd59b208}"
    }
  }
}