Examine source code of SuperGenPass Context Menu

{
  "manifest_version": 2,
  "name": "SuperGenPass Context Menu",
  "description": "Type your master password in password field, and have your unique per-site password generated by invoking Supergenpass from context menu",
  "version": "0.3resigned1",
  "homepage_url": "https://github.com/pdudits/firefox-supergenpass",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "menus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e57cc4c7-4231-470f-9274-71b4d5dec8bd}"
    }
  }
}