Examine source code of znqa

{

  "manifest_version": 2,
  "name": "znqa",
  "version": "0.2.0",

  "description": "A WebExtension providing persistent icons in Zeronet for various Zites.",

  "icons": {
    "48": "icons/znqa.png"
  },

  "web_accessible_resources": [
  "images/zerome.png",
  "images/search.png",
  "images/znqa.png",
  "images/user.png",
  "images/user2.png",
  "images/user3.png",
  "images/user4.png",
  "images/tbpt.png"
  ],

  // https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Implement_a_settings_page
    "options_ui": {
      "page": "options.html",
      "browser_style": true
  },

  // Handle settings button
  "background": {
      "scripts": ["background.js"]
  },

    "browser_action": {
      "browser_style": true,
      "default_title": "Configure znqa",
      "default_icon": {
      "16": "icons/znqa-16.png"
    }
  },

  "content_scripts": [
    {
      "matches": ["http://127.0.0.1/*"],
      "js": ["znqa.js"]
    }
  ],

  "permissions": ["storage"],
    "applications": {
      "gecko": {
          "id": "{34d936da-b404-427f-967c-1ad621c72e42}", // AMO ID
          "strict_min_version": "57.0a1"
      }
  }
}