Examine source code of Burro webcam barcode reader

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDesc__",
  "version": "1.2resigned1",
  "manifest_version": 2,
  "icons": {
    "16": "icons/barcode-16.png",
    "32": "icons/barcode-32.png"
  },
  "applications": {
    "gecko": {
      "id": "barcode@burro66.org",
      "strict_min_version": "45.0"
    }
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/barcode-32.png",
    "default_title": "__MSG_extensionName__",
    "browser_style": true
  },
  "commands": {
    "cmd_barcode": {
      "suggested_key": {
        "default": "Alt+Shift+B",
        "linux": "Ctrl+Shift+B"
      },
      "description": "Send a 'cmd_barcode' event to the extension"
    }
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "default_locale": "en"
}