Examine source code of freaky fox

{
  "manifest_version": 2,
  "name": "freaky fox",
  "version": "1.0",
  "description": "This extension sets every font on every webage to papyrus aka freaky font.",
  "permissions": [
    "activeTab",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "custom-font.ttf"
  ],
  "icons": {
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3be7c34-4a6c-470e-8270-e1b4941f74f5}"
    }
  }
}