Browser Extension Development
Extensions sit inside every page a user visits, which makes them powerful and makes reviewers cautious. Permission requests, remote code and data handling all decide whether yours ships — often more than the feature set does.
Discuss your extension
What We Build
Extensions across the browsers your users actually run.
Wallet Extensions
Web3 wallets with key isolation, provider injection and signing flows designed to be readable.
Productivity Tools
Extensions that add to the sites your users work in — capture, automation, annotation, workflow.
Data & Analytics Overlays
On-page overlays adding your data to third-party sites, for research, pricing or trading tools.
Security Extensions
Phishing detection, approval warnings and site reputation, where trust is the whole product.
Enterprise Extensions
Managed deployment through group policy, with configuration your IT team controls.
MV2 To MV3 Migration
Migrating older extensions to Manifest V3, including the service worker rewrite that usually causes the pain.
What We Handle
Cross-browser builds
One codebase producing Chrome, Firefox, Edge and Safari builds with their API differences abstracted.
Isolated key handling
For wallets, keys kept out of content scripts entirely, with signing behind a strict boundary.
Safe auto-update
Staged rollout, because an extension update reaches every user automatically and a bad one is loud.
Content script hygiene
Isolated styles and DOM handling so your UI does not break the pages it sits on.
Sync and accounts
Optional account sync across devices, with local-only operation as the default.
Store submission
Listing, screenshots, privacy disclosures and handling reviewer questions for each store.
Apps We Have Built Across Sectors
The platform changes, the discipline does not — performance on real devices, offline behaviour and a release process that does not break users.
Talk to our teamApplication Engineering Capabilities
What we hold to on every build, regardless of platform.
Real-device testing
A device matrix drawn from your analytics, tested throughout rather than at the end.
Offline behaviour
Local storage, sync and conflict resolution designed in, not retrofitted after a complaint.
Security hardening
Certificate pinning, encrypted storage and tamper detection where money or identity is involved.
Automated tests in CI
Unit and end-to-end coverage on the critical paths, running on every change.
Observability
Crash reporting, performance tracing and release health visible from the first build.
Release engineering
Staged rollouts, signed builds and a tested rollback for every deployment.
How We Deliver
A loadable build from week one — extensions are quick to get in front of real users.
Scope and permissions
Features mapped to the minimum permissions, with review risk flagged early.
Build
Core functionality built and tested in the target browsers as it goes.
Harden
Security review of message passing, injection and key handling.
Submit and release
Store submissions, review responses and a staged rollout.
Ship An Extension That Passes Review
Tell us what the extension should do. We will map it to the minimum permissions and flag the review risks before you commit.
Get a scope and quoteExtension Questions
Everything you need to know about our app development work.