Examine source code of Waybackify

{
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "browser_action": {
    "default_title": "Waybackify!"
  },
  "description": "Quickly open pages using Archive.org's Way Back Machine",
  "icons": {
    "16": "icon-bitty.png",
    "48": "icon-medium.png",
    "128": "icon-large.png"
  },
  "manifest_version": 2,
  "name": "Waybackify",
  "permissions": [
    "menus",
    "contextMenus",
    "tabs"
  ],
  "version": "0.22.8.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{dcc37a3c-378b-4931-9506-489d52998449}"
    }
  }
}