Examine source code of CSS Radio Box Viewer

{
  "description": "Adds a page action to toggle applying CSS to pages.",
  "manifest_version": 2,
  "name": "CSS-Radio-Box-Viewer",
  "version": "1.2resigned1",
  "homepage_url": "https://github.com/dogskool/CSS-Radio-Box-Viewer",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": "icons/off.svg",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{628bcc6e-51e8-4178-abcd-ec2f52ca2594}"
    }
  }
}