Turn any browser into a powerful tool for your team or customers. We build custom browser extensions that automate repetitive tasks, enhance web workflows, and deliver unique value — built to the latest Manifest V3 standard and published to official extension stores.
Chrome is the most widely used browser globally with over 3.2 billion users. We build extensions using the Manifest V3 (MV3) platform — Google's current and future-proof extension standard. MV3 uses service workers for background logic (instead of persistent background pages), declarative net request for content filtering, and strict permission scoping for better user security. All extensions are built for Chrome Web Store submission and comply with Google's developer policies. Brave browser uses the same MV3 standard — a Chrome extension submitted to the Chrome Web Store also works natively on Brave without modification.
Firefox Add-ons use the WebExtensions API — a cross-browser standard that shares most of its structure with Chrome's extension platform. Firefox has its own differences: it still supports Manifest V2 alongside V3, offers stricter privacy APIs, and is the preferred browser for privacy-conscious users and developers. Firefox Add-ons are distributed via addons.mozilla.org (AMO), Mozilla's official marketplace. We can build your extension for Firefox independently or as part of a cross-browser package where one codebase targets both Chrome and Firefox with minimal adaptation.
Get maximum reach by shipping to multiple browser stores from a single, shared codebase. We build the extension once using a shared-core architecture — common business logic in one module, with thin platform-specific adapters for Chrome (MV3), Firefox (WebExtensions), and Edge. Brave uses the Chrome Web Store directly so no separate build is needed. We handle polyfills for cross-browser API differences (storage, runtime messaging, tabs) and submit the extension to each store on your behalf. This approach is significantly cheaper than maintaining two separate codebases while targeting users on all major browsers.
Browser extensions can fundamentally change how users interact with any website. They can read page content, inject UI elements, intercept network requests, automate repetitive actions, store user preferences, and connect to your backend APIs — all without the user leaving their browser. Here are common use cases we build for businesses and developers.
How We Build Your Extension
We discuss what the extension should do, which browsers to target, and how it connects to your systems.
We design the extension's structure — popup, content scripts, background worker, storage, and API flows.
We build and test the extension using the latest platform standards and browser APIs.
We test across browser versions, check permissions, and verify store policy compliance.
We submit to Chrome Web Store, Firefox AMO, or both — with screenshots, description, and listing copy.
Tell Us About Your Extension Idea
Explore More Services