Examine source code of SFDC Navigation

{
  "manifest_version": 2,
  "name": "SFDC Navigation",
  "version": "1.0",
  "description": "Add-on to easily navigate directly to a SF record, or open the dev console in a new tab",
  "icons": {
    "48": "icons/sfdc-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/sfdc-32.png",
    "default_title": "SFDC Nav",
    "default_popup": "popup/sfdc-nav.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11c322c5-c606-4196-a450-e42d8842e2c8}"
    }
  }
}