Examine source code of Fullscreen anything

{
  "description": "Let user select element to maximize",
  "manifest_version": 2,
  "name": "fullscreen-anything",
  "version": "1.1",
  "icons": {
    "48": "icon.svg"
  },
  "applications": {
    "gecko": {
      "id": "{12d7a739-b2b7-451e-8cde-057bf84783fa}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": "icon.svg",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "Select element to go fullscreen"
  },
  "permissions": [
    "activeTab"
  ],
  "commands": {
    "activate": {
      "suggested_key": {
        "default": "Ctrl+Alt+F"
      },
      "description": "Select element to go full"
    }
  }
}