Examine source code of FirePop!

{
  "manifest_version": 2,
  "name": "FirePop!",
  "version": "0.4.4",
  "description": "__MSG_extensionDescription__",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "overlay.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/favicon16.png",
    "48": "icons/favicon.png",
    "96": "icons/favicon_big.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "nativeMessaging",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "{9f8816f0-c3a1-11dd-ad8b-0800200c9a66}"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "options.html",
    "default_icon": {
      "48": "icons/favicon.png"
    }
  },
  "default_locale": "en"
}