Examine source code of URL2Title

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.1resigned1",
  "default_locale": "en",
  "homepage_url": "https://github.com/Offerel/url2title",
  "applications": {
    "gecko": {
      "id": "url2title@offerel.org",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "options_ui": {
    "page": "scripts/options/options.html",
    "browser_style": true
  },
  "permissions": [
    "tabs",
    "storage"
  ]
}