Examine source code of Open with Binder

{
  "manifest_version": 2,
  "name": "Open with Binder",
  "version": "0.3.1resigned1",
  "description": "Add an 'Open With Binder' icon to the toolbar to launch current GitHub repository on MyBinder.org",
  "homepage_url": "https://github.com/Carreau/open-with-binder-firefox-extension/",
  "icons": {
    "48": "assets/binder_logo_48x48.png",
    "96": "assets/binder_logo_96x96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "content_scripts/browser-polyfill.js",
      "content_scripts/binderify.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "assets/binder_logo_64x64.png",
    "default_title": "Open With Binder"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ebeeaa0e-28d3-4ac2-9dee-e9852fc48a4f}"
    }
  }
}