Examine source code of GX Theme Styles

{
  "manifest_version": 3,
  "name": "GX Theme Styles",
  "version": "1.0.8",
  "description": "Personalize your browser with our preset GX themes or choose your favorite colors and give your browser your personal style.",
  "browser_specific_settings": {
    "gecko": {
      "id": "GXThemeStyles@Godie",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "data/icons/iconFill.svg"
  },
  "permissions": [
    "theme",
    "storage"
  ],
  "action": {
    "default_icon": "data/icons/iconFill.svg",
    "default_title": "GX Theme - click to open the options in popup menu",
    "default_popup": "popup/popup.html"
  },
  "sidebar_action": {
    "default_icon": "data/icons/iconFill.svg",
    "default_title": "GX Theme",
    "default_panel": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}