Chrome, Firefox, Edge, and Safari extensions — Manifest V3 service workers, content scripts, cross-device storage sync, and store review handled end to end. Extensions we've shipped are live in production today, from a school-management tool running across 400+ schools to an AI assistant with thousands of installs in its first month.
Based on 100+ Reviews
100+ Reviews
Why Entalogics for extensions
The reasons clients pick us, in their own words. Each one is something most agencies will swear they do — and most don't.
Service-worker background scripts, no deprecated APIs, no rejection cycle. The review process is part of the build, not an afterthought.
A content-script and background-worker scaffold ready to go. You don't start from a blank manifest.json.
WebExtensions API where Chrome, Firefox, and Edge overlap — and store-specific handling where they don't, like Safari's native app-extension wrapper.
Chrome Web Store, Firefox Add-ons, Edge Add-ons, Safari App Store — listing assets, privacy disclosures, and the submission itself are ours to own.
Verified feedback from Upwork, Clutch, and reference calls we're happy to set up before you sign anything.
CEO, Modestly
Entalogics has successfully delivered extension prototypes on time, and we are impressed with their project management and the finished product. The client communicates with Entalogics via virtual meetings, email, and messaging apps.
Founder, Flourish Schools
Collaborating with Entalogics was a great experience. Communication was clear, we aligned quickly, and their team delivered high-quality code on time with thoughtful technical decisions.
CTO, SentryBay
Their Chromium expertise helped us ship a hardened browser with live threat controls and enterprise rollout support. Security operations became significantly faster.
Founder, G3 Ventures LLC
Entalogics delivered our custom Electron browser in six months with isolated profile workflows and stable policy sync. Agent onboarding improved by 55% after rollout.
Project Manager, Sociall
Entalogics built our iOS Chromium-based mobile app with a smooth native feel, stable media rendering, and reliable sync. We shipped faster and improved engagement after launch.
RozmeriGPT
The web dashboard and Chrome extension now share prompts, billing, and analytics in one platform. Our content turnaround improved 4x after launch.
Project Manager, Omni Browser
Entalogics built our Omni Browser on top of Chromium with deep product-level execution. They implemented an integrated VPN and Omni Crypto Wallet directly in the browser, made strong architectural decisions, and delivered quality code on schedule with clear communication.
Project Manager, Digital Office: Aura
Entalogics built Digital Office: Aura as a custom Chromium-based authentication platform. Their team modified Chromium internals and integrated our manual custom authentication flow with reliable implementation, fast delivery, and consistent communication.
Extensions we built and shipped — what they do, and what happened after launch.
All case studiesWhich browsers we build for
Chrome is our most-shipped target, from Manifest V3 service workers to store-review submission. Firefox, Edge, and Safari work has shipped too — most of it under client NDA and never published here.
What we build
Not case studies. A raw list of specific extension features that only someone who has shipped extensions to a real store would know to build.
Engagement shape
A typical extension engagement, end-to-end. Store submission gets scoped at week one — not bolted on after the build is done.
Stack
Each row below has shipped to a real store review. Predictable, debuggable, and nothing your future team can't maintain.
ENGAGEMENT
Nothing here bills by the hour. Pick the lane that matches your stage: a fixed-quote build, or a fixed-scope monthly retainer for an extension that's already shipped.
For a single-browser extension with a clear spec
Fixed scope, fixed price, from manifest to store approval. Typically 6–9 weeks for a single-browser build.
For ongoing extension work alongside your team
A senior engineer in your Slack and standups for the engagement's length. Scale, pause, or exit with 30 days' notice.
For one extension shipped across every store
One extension, shipped and maintained across Chrome, Firefox, Edge, and Safari — across quarters, not one release.
Want the engineers on your own team instead of a delivered project? Hire Chrome extension developers
Related work
A deeper look at forking Chromium itself, plus real shipped extension work.
Senior engineers
Free 30-minute call with a senior extension developer. By the end you'll have a browser-scope recommendation, a store-review plan, and a realistic ship date — whether you build with us or not.
