Examine source code of Get Archive

{
  "name": "Get Archive",
  "description": "Gets a previous version from a webpage using archive.org, archive.is, webcitation.org or Google Cache.",
  "homepage_url": "http://hugsmile.eu",
  "default_locale": "en",
  "manifest_version": 2,
  "version": "4.0.1resigned1",
  "background": {
    "scripts": [
      "background.js",
      "shared.js",
      "toolbaricon.js"
    ]
  },
  "icons": {
    "64": "icons/dark/getarchive-64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "getarchive.js",
        "utils/keyutils.js",
        "shared.js"
      ],
      "run_at": "document_start"
    }
  ],
  "applications": {
    "gecko": {
      "id": "getarchive@hugsmile.eu",
      "strict_min_version": "63.0"
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "contextMenus",
    "notifications",
    "clipboardRead",
    "clipboardWrite",
    "history",
    "activeTab",
    "search",
    "webRequest",
    "webRequestBlocking",
    "https://web.archive.org/*:80*",
    "<all_urls>"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "icons/dark/getarchive-64.png",
    "browser_style": true
  }
}