Examine source code of AnonF2

{
  "manifest_version": 2,
  "name": "AnonF2",
  "version": "0.33resigned1",
  "description": "Hides username and avatar while browsing fer2.net",
  "icons": {
    "48": "anon.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.fer2.net/*"
      ],
      "js": [
        "f2.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": "anon.jpg",
    "default_title": "AnonF2",
    "default_popup": "anon.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{afbc9b22-a8eb-4423-a698-22f5e558eb08}"
    }
  }
}