webext-tools [](https://www.npmjs.com/package/webext-tools)

April 11, 2026 · View on GitHub

Utility functions for Web Extensions

Sponsored by PixieBrix :tada:

Install

npm install webext-tools

Or download the standalone bundle to include in your manifest.json.

This package exports various utilities. Each tool has its own entry point, so you only import what you need:

import doesTabExist from 'webext-tools/does-tab-exist.js';
import getExtensionUrl from 'webext-tools/get-extension-url.js';

doesTabExist - Checks whether a tab exists.
getExtensionUrl - Generates a URL object for a resource bundled with the extension.
getTabUrl - Get a tab or frame’s URL even with limited permissions.
queryTabsByUrl - Get the IDs of tabs matching URL patterns.
setActionPopup - Sets the popup URL (or removes the popup) depending on the current tab.
createContextMenu - Creates context menus without pain.
devToolsEval - Wrapper around the DevTools eval function that throws proper errors.
addOptionsContextMenu was moved to webext-bugs.

webext-events - High-level events and utilities for events in Web Extensions.
webext-base-css - Extremely minimal stylesheet/setup for Web Extensions’ options pages (also dark mode)
webext-options-sync - Helps you manage and autosave your extension's options.
webext-detect - Detects where the current browser extension code is being run.
More…