Examine source code of Wayback Machine Helper

{
  "manifest_version": 2,
  "name": "Wayback Machine Helper",
  "version": "0.8resigned1",
  "description": "Search and access the current URL on archive.org's Wayback Machine. Access it by raising the context-menu by right-clicking on a page, or a link.",
  "author": "gammy",
  "homepage_url": "https://github.com/gammy/wayback_helper",
  "icons": {
    "16": "icons/wayback-16.png",
    "24": "icons/wayback-24.png",
    "32": "icons/wayback-32.png",
    "48": "icons/wayback-48.png",
    "64": "icons/wayback-64.png"
  },
  "background": {
    "scripts": [
      "wayback_helper.js"
    ]
  },
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fff3a8b2-f857-4b17-bd72-3350035cbd24}"
    }
  }
}