Examine source code of LinkStart

{
  "manifest_version": 2,
  "name": "LinkStart",
  "version": "1.0.0",
  "description": "Launch groups of websites with one click. Supports auto-login scripts and Firefox startup automation.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "storage-wrapper.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "LinkStart",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "linkstart@developer.knws.co.uk",
      "strict_min_version": "78.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}