Examine source code of FoxChat

{
  "manifest_version": 2,
  "name": "FoxChat",
  "version": "1.1",
  "description": "Official FoxChat Extension for Mozilla Firefox.",
  "icons": {
    "48": "icons/FoxChat Icon 48x.png",
    "96": "icons/FoxChat Icon 96x.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/FoxChat Icon 32x.png",
    "theme_icons": [
      {
        "light": "icons/Dark FoxChat Icon 32x.png",
        "dark": "icons/Light FoxChat Icon 32x.png",
        "size": 32
      }
    ],
    "default_title": "FoxChat",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{493e682e-de40-4549-90c4-3832ca7da4df}"
    }
  }
}