Hire Browser Extension developers

Build powerful Chrome, Firefox, and Edge extensions with expert developers. Improve user experience—hire now and onboard quickly.

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fully vetted developers

24 hours

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2.3M hours

worked since 2015

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Gotta drop in here for some Kudos. I’m 2 weeks into working with a super legit dev on a critical project and he’s meeting every expectation so far 👏

Francis Harrington

Founder at ProCloud Consulting, US

I recommend Lemon to anyone looking for top-quality engineering talent. We previously worked with TopTal and many others, but Lemon gives us consistently incredible candidates.

Allie Fleder

Co-Founder & COO at SimplyWise, US

I've worked with some incredible devs in my career, but the experience I am having with my dev through Lemon.io is so 🔥. I feel invincible as a founder. So thankful to you and the team!

Michele Serro

Founder of Doorsteps.co.uk, UK

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How to hire Browser Extension developer through Lemon.io

Place a free request

Fill out a short form and check out our ready-to-interview developers

Tell us about your needs

On a quick 30-min call, share your expectations and get a budget estimate

Interview the best

Get 2-3 expertly matched candidates within 24-48 hours and meet the worthiest

Onboard the chosen one

Your developer starts with a project—we deal with a contract, monthly payouts, and what not

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What we do for you

Sourcing and vetting

All our developers are fully vetted and tested for both soft and hard skills. No surprises!

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matching

We match fast, but with a human touch—your candidates are hand-picked specifically for your request. No AI bullsh*t!

Arranging cooperation

You worry not about agreements with developers, their reporting, and payments. We handle it all for you!

Support and troubleshooting

Things happen, but you have a customer success manager and a 100% free replacement guarantee to get it covered.

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FAQ about hiring Browser Extension developers

Where can I find Browser Extension developers?

Try targeting general job platforms such as GlassDoor, Dice, and LinkedIn, for starters. It is also wise to look for particular platforms specifically visited by developers who specialize in front-end technologies (HTML, CSS, JavaScript). Look at the web development communities: Behance, Dribble, web design conferences, or browser extension workshops.

If that is sounding like too much work, look into targeted talent platforms such as Lemon.io that can help your business connect with developers well-versed in browser extension development in 48 hours or less.

What is the no-risk trial period for hiring Browser Extension developers on Lemon.io?

At Lemon.io, we let clients hire talent with confidence and offer no-risk trials to help them choose the best programmer. Our no-risk, paid trials let you and your potential programmer work together on a real-world task relevant to your project for up to 20 hours. This will help gauge technical skills, evaluate the coder’s style of communication and how they collaborate within your team.

And we’ve also got you covered with a 100%, no-risk replacement guarantee in case something just doesn’t feel right with a given developer. Lemon.io is always there to make sure things are running smoothly. Just a note – the replacement is not our tradition, just an option that we guarantee to our clients.

Is there a high demand for Browser Extension developers?

Yes, the demand for browser extension developers is climbing as businesses in different industries use them more. These small programs can do lots of useful tasks, like giving shoppers price comparisons, helping workers get things done quickly, or learning more about customer habits. Many areas, such as online stores, task management apps, and online ad companies, are finding browser extensions incredibly useful.

Because modern browsers can do so much more now, companies relying on web apps & online services create and drive this demand.

How quickly can I hire a Browser Extension developer through Lemon.io?

You can expect to see a selection of pre-vetted, talented Browser Extension developers within 48 hours or less of contacting Lemon.io. You’ll then have control over the hiring timeline — you can onboard the Software Engineer in a few days.

What are the main strengths of Lemon.io’s platform?

Our network spans over 300 different websites & online programmer communities that we constantly scan to find the most sought-after experts.

Every engineer we introduce to you is carefully assessed through a multi-stage evaluation process; only 1% of those applying actually join us on Lemon.io.

Lemon.io guarantees a fast and efficient substitution in case any technical hurdles or project hurdles happen during a coder’s engagement. But be sure, we don’t need to do it routinely – the replacement is an option, not the usual task for us.

What is the vetting process for developers at Lemon.io?

We maintain high standards for Browser Extension developers:

1. Candidates provide detailed profiles outlining their experience building browser extensions and demonstrating their front-end development skills.
2. Our recruiters review each CV and cross-reference provided information with platforms like LinkedIn and assess portfolios for relevant projects.
3. Shortlisted candidates complete a screening process, the part of it is a technical review, often on Coderbyte, that includes coding challenges related to browser extension development.
4. Top candidates participate in a technical interview run by a tech interviewer with huge browser extension expertise.

How can your business benefit from hiring a Browser Extension developer?

A Browser Extension developer builds helpful programs to improve people’s internet experience by enhancing web browsers. With these, you can create custom browsing experiences and simplify processes, crafting features the typical web browser lacks.

This can be put to good use in marketing and commerce: some extensions even give a better analysis of consumer behavior, giving a better understanding of what users want most online while they interact with the company website.

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Nataliia Stasiuk

Recruiter at Lemon.io

Hiring Guide: Browser Extension Developers

Hiring browser extension developers is about more than JavaScript—it’s about shipping secure, performant, cross-browser add-ons that survive changing permission models, store policies, and evolving Manifest V3. Great candidates understand Chrome/Edge, Firefox, and Safari differences; they design least-privilege architectures; and they can turn product ideas into stable extensions with clear analytics and upgrade paths. Use this guide to scope the role, evaluate portfolios, interview for real-world signals, and plan the first month—plus find related Lemon.io roles to round out delivery (front end, back end, QA, DevOps).

When to Hire a Browser Extension Developer

Your product lives “next to” the web: Productivity overlays, form helpers, price trackers, summarizers, content clipping, or context sidebars.
You need deep page integration: Content scripts that read/annotate pages, inject UI, and communicate with a background service worker.
Complex permissions or native bridges: OAuth, cookies/session management, CORS, native messaging hosts, or file system access.
Multi-browser reach: Chrome/Edge (WebExtensions MV3), Firefox (MV2+WebExtensions), and Safari Web Extensions / App Extensions on macOS & iOS.

What Great Extension Developers Actually Do

Architect for least privilege: Minimize requested scopes; isolate sensitive logic in background/service workers; request optional permissions at runtime; keep content scripts narrowly focused.
Master the extension surface: Action popups, side panels, context menus, omnibox, declarativeNetRequest (DNR), storage, alarms, and declarativeContent.
Ship cross-browser correctly: Use the WebExtensions API where possible; abstract vendor differences; keep UI consistent across Chromium/Firefox/Safari.
Handle identity and data safely: OAuth/device flows, cookie handling, PKCE, token refresh; encrypt at rest (where feasible) and avoid storing secrets client-side.
Design resilient messaging: Tab ↔ content script ↔ background messaging; robust schema validation; retries and timeouts; versioned message contracts.
Optimize performance: Small payloads, lazy loaded modules, content script gating, minimal DOM mutation, and careful event listeners to avoid jank.
Pass store review and keep it there: CSP compliance, privacy disclosures, limited data collection, and fast response to policy changes or user reports.

Common Use Cases (Map Them to Candidate Profiles)

Productivity overlays: Side panels that summarize, translate, or enrich pages; requires DOM safety, MutationObserver discipline, and hot-path performance.
Commerce & coupons: Inject UI in checkout flows, autofill forms, and apply codes; needs robust selectors, A/B testability, and strong QA.
Research & clipping: Capture cleaned content with metadata, screenshots, and tags; sync to a back end (REST/GraphQL) with offline retries.
Security & compliance helpers: Policy reminders, data redaction tooling, or phishing indicators; heavy on permission reviews and auditability.
Developer tools: DevTools panels, network observers, or log collectors; requires careful CSP and permission scoping.

Adjacent Lemon.io Roles You May Also Need

JavaScript Developer for core logic, modern tooling, and testing basics.
React Developer for complex popup/side-panel UIs, virtualized lists, and state management.
Front-End Developer for design systems, accessibility, and performance polish.
Back-End Developer to build APIs, webhooks, quota/rate limits, and auth flows leveraged by the extension.
Full-Stack Developer to deliver vertical slices (extension + services + dashboard).
QA Engineer (Automation) for deterministic UI tests across browser matrices and sites.
DevOps Engineer to automate signing, store uploads, release channels, and error monitoring.
Data Analyst to build dashboards for adoption, retention, and funnel health.

Define the Role Clearly (Before You Post)

Outcomes (90–180 days): “Launch MV3 Chrome + Firefox parity,” “<100ms median content script start,” “90% store rating,” “reduce permission footprint by 50%.”
Target browsers & channels: Chrome/Edge, Firefox, Safari; stable vs. beta channels; enterprise distribution or consumer store.
Auth & data: OAuth providers, token lifetimes, storage strategy (sync/local/session), encryption needs, and data retention rules.
Back end: Required endpoints, webhooks, quotas, rate limiting, and error taxonomy for reliable client behavior.
Compliance & privacy: Data classification, user consent, telemetry scope, and store policy disclosures (especially for content/sensitive scopes).

Job Description Template (Copy & Adapt)

Title: Browser Extension Developer — MV3 • WebExtensions • Cross-Browser

Mission: Design and ship secure, performant Chrome/Firefox/Safari extensions that deliver measurable user value while meeting strict permission and privacy standards.

Responsibilities:

Build extensions using WebExtensions/MV3: background service workers, content scripts, popups/side panels, options pages, and messaging.
Implement least-privilege permission models; request optional permissions just-in-time; keep CSP tight and code signed.
Integrate with APIs (REST/GraphQL), OAuth flows, and (if needed) native messaging hosts; handle retries, timeouts, and idempotency.
Optimize performance: lazy loading, minimal DOM mutation, debounced observers, and careful storage usage.
Automate testing (unit, integration, e2e across Chrome/Firefox/Safari) and CI pipelines for packaging/signing/release channels.
Prepare store submissions (artifacts, descriptions, privacy disclosures) and respond quickly to review feedback and policy shifts.

Must-have skills: WebExtensions/MV3, JavaScript/TypeScript, DOM and CSP mastery, OAuth/cookies basics, cross-browser differences, automated testing, Git/CI.

Nice-to-have: React for UI shells, Safari App Extensions, native messaging hosts, DNR rules, GraphQL, analytics/event pipelines, i18n/a11y.

How to Shortlist Candidates (Portfolio Signals)

Store proof: Live links with ratings, version history, and clear changelogs; evidence of fast policy-review turnaround.
Least-privilege designs: Past apps with minimal scopes or just-in-time permissions; rationale for each scope in READMEs.
Robust messaging: Typed/validated message schemas, retry logic, and versioning that avoids breakage across releases.
CSP & security hygiene: No unsafe-eval; asset hashing; strict script policies; content sanitation and sandboxing.
Cross-browser parity: Demonstrated abstractions for Chrome/Firefox/Safari differences (MV3 service workers vs. Firefox background pages, Safari packaging).
Telemetry & quality: Error tracking, performance baselines, and test automation in CI across browser matrices.

Interview Kit (Signals Over Trivia)

Permissions & privacy: “Design a minimal-scope extension that annotates prices on retail sites. Which permissions do you request up front vs. at runtime, and how do you disclose data use?”
Messaging & reliability: “A content script sends actions to a background worker and occasionally ‘hangs.’ Show your message schema, timeout/retry strategy, and how you’d debug.”
Cross-browser plan: “Ship Chrome MV3 and Firefox with the same codebase. What build steps and shims are needed? How do you handle Safari?”
Performance: “A content script slows down pages with infinite scroll. How do you tame observers, minimize DOM thrash, and measure success?”
Auth & CORS: “Walk through an OAuth flow inside an extension, token storage, refresh, and CORS considerations for API calls.”
Store submission: “Your update was rejected for ‘excessive permissions’ and CSP issues. What’s your remediation checklist and resubmission plan?”

First-Month Success Plan

Week 1 — Baselines & Access: Set up dev certs, signing keys, CI packaging; define performance baselines (content script init, UI open time); audit current permissions and CSP.
Week 2 — Thin Vertical Slice: Ship one end-to-end flow (content script → background → API) behind a feature flag with analytics, error tracking, and typed message contracts.
Week 3 — Cross-Browser Readiness: Add Firefox build, fix polyfills/shims, and prepare Safari Web Extension packaging; create a parity checklist and automated smoke tests.
Week 4 — Store Submission & Hardening: Finalize privacy disclosures, screenshots, and store listings; implement least-privilege permission prompts; tighten CSP; stage rollout and monitor crash/error funnels.

Scope & Cost Drivers (Set Expectations Early)

Browser matrix & features: Supporting Chrome, Firefox, and Safari adds build, QA, and policy effort—especially for extensions that inject complex UI.
Permission footprint: Sensitive scopes (e.g., tabs, activeTab, clipboardWrite, DNR rules) increase design/review cycles and store scrutiny.
Target sites’ complexity: Dynamic frameworks (React/Vue/Next), CSP variations, and frequent DOM changes require resilient selectors and test coverage.
Back-end dependencies: Extensions that create/consume data need robust APIs, auth, quotas, and observability which add work beyond the client.
Enterprise distribution: Managed policies, SSO, and update channels require additional tooling and documentation.

Call to Action

Get matched with vetted Browser Extension Developers—share your browsers, target sites, and privacy requirements to receive curated profiles ready to ship.

FAQ

What’s the difference between MV2 and MV3?: MV3 replaces persistent background pages with service workers, tightens network and CSP rules, and shifts to declarative APIs like DNR. It improves security and performance but requires architectural adjustments.
How do we minimize requested permissions?: Request only what’s needed upfront, defer sensitive scopes with optional permissions, scope host permissions to specific domains, and explain benefits to users in clear UI copy.
How can an extension stay fast on heavy pages?: Lazy load scripts, throttle observers, batch DOM updates, defer heavy work to background workers, and avoid layout thrash by using virtualized rendering for injected UI.
What are common store-review pitfalls?: Over-broad permissions, unclear data usage, unsafe CSP, bundled trackers, and missing disclosures. Keep data collection minimal and explain exactly how and why you use it.
How do we test reliably across sites and browsers?: Use a deterministic test harness with fixture pages, add automated e2e runs in Chrome/Firefox (and Safari where feasible), and maintain a “selector contract” layer to adapt to site DOM changes without breaking logic.

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Hire remote Browser Extension developers