Examine source code of Fullscreen Anything

{
  "manifest_version": 2,
  "name": "Fullscreen Anything",
  "version": "1.1",
  "description": "Force fullscreen mode on any web element using a visual picker.",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "Pick an element to fullscreen",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fullscreen-anything@rtom",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}