Examine source code of PixelZoomer

{
  "manifest_version": 2,
  "name": "PixelZoomer",
  "short_name": "PixelZoomer",
  "default_locale": "en",
  "version": "2.0.3",
  "author": "Matthias Schuetz",
  "description": "__MSG_appDescription__",
  "background": {
    "scripts": [
      "content/browser.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+Q",
        "mac": "Alt+Shift+Q"
      }
    }
  },
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "PixelZoomer",
    "browser_style": true
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "options_ui": {
    "page": "content/options.html",
    "chrome_style": true
  },
  "permissions": [
    "tabs",
    "activeTab",
    "contextMenus",
    "<all_urls>",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "pixelzoomer@matthiasschuetz.com",
      "strict_min_version": "48.0"
    }
  }
}