Custom Chrome Extension Development
Browser extensions built from a blank file on Manifest V3 for the exact workflow you need, whether internal tooling or a public product.
Chrome Extension Development
Chrome Extensions for Your Workflow
We build Manifest V3 browser extensions for internal tools and public Web Store products. Integrated with your systems, securely permissioned and built to evolve with Chrome by WebNX Global Services’ full-stack team since 2008.
- Manifest V3
- Security By Default
- You Own The Code
- Built To Outlast Updates
0+ Years building browser tools
0+ Custom extensions shipped
0% Client satisfaction rate
0/7 Support & monitoring coverage
The cost of the wrong tool
Is your team working around software instead of with it?
If any of these feel familiar, a custom extension isn't a luxury, it's the fix. Every one of these problems is solvable with the right approach and the right team.
06 friction points we design out of every build
- 01
Repetitive browser work eating your team's day
Your people copy data between tabs, reformat it and paste it into another tool, over and over. A purpose-built extension does that work in one click, right where the work already happens.
- 02
A Web Store tool that almost does the job
There's always an extension that covers eighty percent of what you need and nothing for the rest. A custom build does the exact job, with no clutter and no features you have to work around.
- 03
Free tools you can't trust with your data
Free extensions often read everything on the page and send it who knows where. When the tool touches company or customer data, you need one built to a permission model you control and can audit.
- 04
No line to the systems you already run
A generic extension can't talk to your CRM, internal API or dashboard. A custom build surfaces your data right in the browser and pushes actions straight back to your systems.
- 05
Manifest V3 broke a tool you relied on
Chrome's move to Manifest V3 retired older extensions and APIs. If something your team depended on stopped working, it needs rebuilding on the current platform, properly.
- 06
A product idea that belongs in the browser
Some of the best software products are browser extensions. If your idea lives there, you need a partner who can build it, ship it to the Web Store and keep it maintained.
Built with proven tools
Technologies we work with
We build on the current Chrome extension platform and only bring in outside libraries where they genuinely earn their place and stay maintained.
JS JavaScript
TS TypeScript
V3 Manifest V3
Cr Chrome APIs
Re React
Vi Vite
SW Service Workers
WS Web Store
Ed Edge
Fx Firefox
DB IndexedDB
Tw Tailwind
No Node.js
Wp Webpack
Je Jest
Gi Git
What we build
Our Chrome extension development services
From a focused productivity tool to a full product with accounts and a backend, every project starts from a blank file.
Productivity & Workflow Tools
Extensions that automate repetitive browser tasks, fill forms, capture and reformat data, or surface the information your team needs without leaving the page.
CRM & Internal System Integration
Extensions that connect the browser to your CRM, helpdesk, internal API or dashboard, so your team acts on your data without switching tabs.
Secure, Permission-Scoped Builds
Extensions built to request only the permissions they need, handle data responsibly and pass both Web Store and internal security review.
Chrome Web Store Publishing
Extensions prepared against current review and policy requirements and submitted to the Chrome Web Store, so listing approval isn't a scramble.
Cross-Browser Extensions
One codebase that runs on Chrome, Edge and Brave, and on Firefox where the APIs allow, so you reach every user without maintaining separate builds.
Manifest V3 Migration
Older Manifest V2 extensions rebuilt on Manifest V3 with service workers and current APIs, so they keep working as Chrome retires the old platform.
Team & Enterprise Deployment
Private extensions rolled out to your workforce through managed Chrome policies or a private Web Store listing, with the controls your IT team needs.
Data Capture & Automation
Extensions that capture, structure and export data from the pages your team works in, cutting manual copy and paste out of the daily routine.
Browser API & DOM Integration
Deep work with the tabs, storage, scripting, context menu and messaging APIs, plus reliable DOM injection that survives the sites you target.
Performance & Reliability
Lean service workers and efficient content scripts that do their job without slowing the browser or draining battery on the user's machine.
Maintenance & Support
Ongoing updates as Chrome ships new versions and policy changes, plus a helpdesk that keeps your extension published and working.
Who we work with
Industries we build browser extensions for
We've built for teams across fast-moving SaaS, high-volume sales floors and regulated sectors alike. We learn your workflow before we ever touch a manifest.
SaaS & Technology
Sales & Revenue Teams
Recruitment & Staffing
Ecommerce & Retail
Marketing & SEO
Financial Services
Logistics & Fulfillment
Agencies
Internal Tools & Productivity
Education & EdTech
Why choose us
Browser extension development done the right way
Anyone can build a browser extension. We engineer ones that are secure, lean, compatible with the next Chrome release and fully owned by you, then stay around to maintain them.
Start your project-
Built on current Manifest V3
We build on the platform Chrome actually supports today, so your extension isn't obsolete the month after it ships.
-
Least-privilege by default
We request only the permissions the extension genuinely needs, which protects your users and speeds up store review.
-
Wired into your systems
We connect extensions to your CRM, API or dashboard so they do real work, not just rearrange the page in front of you.
-
We handle Web Store review
We know Chrome Web Store policy and prepare your listing to pass, including the data-use disclosures reviewers look for.
-
Cross-browser where it counts
We build on standards so the same extension runs on Chrome, Edge and beyond wherever the APIs allow.
-
Lean and reliable
Efficient service workers and content scripts that do the job without slowing the browser or breaking when a target site changes.
-
You own the code
Full IP assignment on every contract. The extension and its source belong to you outright, with no recurring licence on your own tool.
-
Maintained as Chrome evolves
Chrome ships updates and policy changes constantly. We keep your extension compatible and published instead of letting it quietly break.
How we work
Our Chrome extension development process
Eight clear stages, each with a visible output you can review and approve. No black box between kickoff and launch.
- 01
Discovery
We map the workflow, the sites it touches and the systems the extension needs to connect to.
- 02
Architecture
Manifest, permissions, service worker and messaging approach agreed and documented before development starts.
- 03
UI Design
The popup, options page and any injected interface designed and signed off before we touch code.
- 04
Development
Clean, documented code built on Manifest V3, with a demo at every milestone.
- 05
QA & Testing
Cross-site, cross-browser and permission testing before anything ships.
- 06
Launch
Deployed to your team or submitted to the Chrome Web Store with policy requirements already met.
- 07
Review Support
Any reviewer feedback handled quickly, so your listing clears without unnecessary delay.
- 08
Support
Ongoing updates and compatibility checks with every Chrome release.
What is included
A free extension isn't the same asset
The gap between a Web Store extension and a custom-built one shows up in what it can actually do for your team. Here is what comes standard with every extension we deliver.
What you get Web Store extension WebNX
Built around your exact workflow
Full IP ownership, no recurring licence
Least-privilege, audited permissions
Connected to your CRM or API
Manifest V3 and current APIs
Cross-browser where supported
Basic browser functionality
Generic, one-size-fits-all features
Web Store submission handled
Post-launch support & updates
Client words
Trusted by teams that depend on their browser extensions
Our reps used to copy lead details between the CRM and three other tabs all day. The extension they built surfaces everything in one panel and writes straight back to the CRM. It handed each rep close to an hour back every day.
They rebuilt our sourcing extension on Manifest V3 after the old one stopped working. It's faster than before, passed Web Store review first time, and our recruiters barely noticed the switch.
Our whole product is a Chrome extension, and they took it from idea to a published Web Store listing. The permission model is clean, it runs lightly, and every Chrome update gets handled before it becomes our problem.
Questions, answered
Chrome extension development FAQs
How much does a Chrome extension cost?
The cost depends on the extension's functionality, integrations and backend requirements. A focused tool is simpler, while product-grade extensions with complex workflows require more development. Every project is scoped and quoted individually.
How long does it take to build a Chrome extension?
A focused extension typically takes 3 to 7 weeks. A product-grade build with accounts, a backend and integrations usually runs 8 to 16 weeks. You see a working build early, with a demo every sprint.
What is Manifest V3 and does it affect me?
Manifest V3 is Chrome's current extension platform. It changed how extensions run, replacing background pages with service workers and tightening permissions. Older Manifest V2 extensions are being retired, so anything built before it usually needs migrating to keep working.
Can the extension connect to our CRM or internal tools?
Yes. Connecting the browser to your CRM, helpdesk, internal API or dashboard is one of the most common reasons clients come to us for a custom extension. We handle authentication and data flow securely.
Will it work on Edge, Brave and Firefox too?
Often yes. Chrome, Edge and Brave share the same engine, so a Chrome extension usually runs on all three. Firefox uses a similar but separate API, which we can target from one codebase where the features line up.
Can you publish it to the Chrome Web Store?
Yes. We prepare the listing, assets and required data-use disclosures, submit the extension and handle any reviewer feedback until it's approved and live.
Can you distribute it privately to our team only?
Yes. We can publish as an unlisted or private Web Store listing, or distribute through managed Chrome enterprise policies, so only your people can install it.
Is a custom extension secure?
It's as secure as it's built to be. We request only the permissions the extension needs, validate data, avoid risky injection patterns and follow Web Store policy, so it passes review and protects your users.
Can you rebuild our old extension that stopped working?
Yes. We audit the existing extension, then rebuild it on Manifest V3 with current APIs, keeping the behaviour your users rely on while bringing it back into compliance.
Do you build the backend too?
Yes. Many extensions need an API, database or authentication behind them. We build that alongside the extension so the two fit, or integrate with your existing backend.
Will it keep working as Chrome updates?
On a maintenance plan, yes. Chrome ships frequent updates and policy changes. We test against them and update your extension so it stays published and functional.
What happens after the extension launches?
Every project includes a handover, documentation and a warranty window for fixes. Most clients move onto a maintenance plan so the extension stays compatible as Chrome evolves. We're still around for version two, not just while the invoice is open.
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