Examine source code of Elefinder

{
  "manifest_version": 2,
  "name": "Elefinder",
  "version": "0.1",
  "description": "Allows finding mastodon users more easily.",
  "homepage_url": "https://github.com/kiloku/Elefinder",
  "icons": {
    "48": "icons/elefinder-48.png",
    "96": "icons/elefinder-96.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/elefinder-32.png",
    "default_title": "Elefinder",
    "default_popup": "popup/user_finder.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f7c66cd-26f8-4569-8034-78cbc6ac1d0b}"
    }
  },
  "options_ui": {
    "page": "settings/options.html"
  }
}