🧩 #1 Rated Chrome Extension Development Company
Custom Chrome Extensions Built on Manifest V3 That Get Featured, Not Rejected
Stallyons is the Chrome Extension Development Agency trusted by SaaS founders, productivity startups, and enterprise IT teams. Custom Manifest V3 extensions, AI-powered browser tools, SaaS companion extensions, scrapers and automation, and enterprise internal tools — built cross-browser for Chrome, Edge, Brave, and Firefox, and engineered to pass Chrome Web Store review on the first submission.
Built to Pass Web Store Review
- Manifest V3 Compliant
- Web Store Approval Ready
- Cross-Browser Compatible
Triple Extension Guarantee:
- Manifest V3 Compliant
- Web Store Approval Ready
- Cross-Browser Compatible
Extensions Shipped
0
+
Web Store Rating
0
★
First-Submit Approval
0
%
Our Extension Suite
Productivity Tools
60+ Built
Sales & Marketing
40+ Built
AI-Powered
35+ Built
Scrapers & Automation
50+ Built
SaaS Companions
45+ Built
Enterprise Internal
30+ Built
V2 → V3 Migration
70+ Done
Cross-Browser
Edge/Brave/FF
Web Store Publishing
160+ Live
Avg. Web Store Rating
4.8★
On-Time Delivery
96%
↑ 4%
Repeat Clients
81%
Trusted By Startups
What a Specialist Chrome Extension Company Actually Delivers
A specialist Chrome Extension Development Company builds far more than a content script that runs on page load. It architects complete browser-native products: Manifest V3 service workers handling background logic, declarativeNetRequest rules for content filtering, content scripts injecting UI into any page, chrome.identity flows for OAuth, and chrome.storage.sync for cross-device state — distributed through the Chrome Web Store to over 3.5 billion Chromium-based browsers across Chrome, Edge, Brave, and Opera.
The opportunity is asymmetric. A great Chrome extension puts your product inside every user’s browser, adjacent to the URL bar and active on every page they visit. The wrong extension gets stuck in review limbo, rejected for vague policy violations, or breaks after the next Chrome update. The difference between an extension that gets featured and one that gets buried comes down to engineering discipline — the discipline a specialist Chrome Extension Development Service brings from day one.
Our Full Chrome Extension Range
Productivity & Utility Extensions: Tab managers, note-takers, snippet tools, workflow automations, and content-blockers built on Manifest V3 service workers that stay fast and never drain a laptop battery.
Sales & Marketing Extensions: Lead scrapers, LinkedIn and CRM enrichment tools, outreach helpers, and prospecting overlays that inject clean UI into any page and sync securely to your backend.
AI-Powered Browser Tools: LLM sidebars, summarizers, and writing assistants wired to OpenAI, Anthropic Claude, and Gemini via streaming APIs, secure key handling, and freemium usage gating.
Scrapers & Automation: Data-extraction, form-fill, and page-automation extensions with resilient content scripts that survive dynamic SPAs and single-page-app navigation.
SaaS Companion Extensions: In-app overlays, chrome.identity OAuth login, chrome.storage.sync state, license validation, and subscription gating that turn your web app into a browser-native product.
Enterprise Internal Tools: Force-installed extensions deployed via Google Workspace admin policies, Microsoft Intune, or MDM — SSO, compliance helpers, and internal dashboards at Fortune-500 scale.
Why Stallyons Is the Extension Partner Teams Trust
- Native Manifest V3 Expertise: Service worker lifecycles, declarativeNetRequest, the scripting and action APIs — built correctly from day one, not lazily ported from V2 patterns that break in subtle ways.
- 98% First-Submit Approval: We know exactly which permissions trigger reviewer scrutiny, how to write permission justifications, and how to satisfy the single-purpose policy — so you ship on the first submission, not the fifth.
- True Cross-Browser Builds: One codebase shipping to Chrome, Edge, Brave, Opera, Vivaldi, and Firefox (via the WebExtensions polyfill), with per-browser manifest variants and store-specific submission packages.
- Security & Permissions Hygiene: Minimum host_permissions, optional permissions for sensitive APIs, secure cross-context messaging, CSP-compliant resources, and supply-chain audits on every dependency.
- Secure APIs & Integrations: chrome.identity OAuth flows, background service-worker backends, license and subscription validation, and encrypted communication with your SaaS.
- Updates That Survive Chrome: Chrome ships every 4 weeks. We track Chromium policy changes, test on Canary and Beta, and hotfix fast — so your extension keeps working long after launch.
How to Start Your Chrome Extension Project
Every engagement starts with a free 45-minute strategy session. No slide deck and no sales script — we audit your use case, flag the permissions and policies that matter, and map the fastest path to a Web-Store-approved extension.
We are selective about new extension projects and cap our active client count to keep senior developers on every build. That is how we hold a 98% first-submit approval rate and an 81% repeat-client rate.
Why Clients Choose Us
160+
Extensions Shipped
98%
First-Submit Approval
5
Chromium Browsers
4.9/5
Client Rating
Ready to ship a Chrome extension that actually gets used?
Extension Types We Build
Chrome Extension Types Our Team Builds
From AI-powered productivity tools to force-installed enterprise deployments, we design and build custom browser extensions for every use case and business model.
Productivity & Utility
Tab managers, notes, workflow helpers
60+ BUILT
AI Browser Assistants
LLM sidebars, summarizers, writers
GPT · CLAUDE
Sales & Marketing
Lead scrapers, outreach, CRM sync
40+ BUILT
SaaS Companions
In-app overlays, sync, licensing
45+ BUILT
Scrapers & Automation
Data extraction, form-fill, bots
50+ BUILT
Enterprise Internal Tools
Force-install, SSO, dashboards
30+ BUILT
Ecommerce & Deals
Price trackers, coupons, checkout
25+ BUILT
V2 → V3 Migration
Service workers, DNR, rewrites
70+ DONE
Cross-Browser Builds
Edge, Brave, Firefox, Opera
5 BROWSERS
Web Store Publishing
Review, ASO, appeals, updates
98% APPROVED
Not sure which extension architecture fits your idea? Let's map it together.
Common Challenges
Is Your Chrome Extension Stuck in Review Hell?
These are the most common and costly failures in browser-extension projects — and most stay invisible until your extension is rejected, broken, or quietly losing users.
Rejected by the Web Store
01
Vague single-purpose violations, unjustified permissions, missing privacy disclosures. Reviewers reject on details most developers never see coming — and each round trip costs weeks.
Broken by Manifest V3
02
Google deprecated Manifest V2 in mid-2024. V2 extensions no longer install for new users, and a naive port to V3 looks correct but breaks in subtle, hard-to-debug ways.
Service Worker Bugs
03
Background pages ported straight to service workers terminate mid-operation, drop event listeners after waking, and lose state — producing flaky behavior no one can reproduce.
Battery & Performance Drain
04
Bloated background scripts, un-debounced storage writes, and always-on content scripts murder page-load times and drain laptops — users notice, and one-star reviews follow.
Breaks After Chrome Updates
05
Chrome ships every 4 weeks. Without an active partner tracking Chromium policy and API changes, your extension quietly breaks and users churn before you even notice.
Over-Permissioned & Insecure
06
Broad host_permissions, insecure cross-context messaging, and unvetted dependencies invite both reviewer rejection and real security incidents that damage your brand.
Hitting any of these walls? Let's engineer an extension that ships and stays shipped.
Our Extension Services
6 Core Chrome Extension Services Built to Compound
Each service is a senior extension team. Mix, match, or run them in parallel — every layer is built on Manifest V3 to ship fast and survive every Chrome update.
Custom Extension Development
01
Ground-up Manifest V3 extensions — service-worker backgrounds, content-script UI, popups, side panels, and the scripting and action APIs — engineered for productivity tools, SaaS companions, and browser-native products.
Manifest V2 → V3 Migration
02
We rewrite background pages as service workers, convert blocking webRequest to declarativeNetRequest, remove remote code, and refactor state to chrome.storage and IndexedDB — with full regression testing, not a lazy port.
AI-Powered Extensions
03
LLM sidebars, summarizers, and writing assistants wired to OpenAI, Claude, and Gemini — streaming responses, secure key handling, prompt pipelines, and freemium usage gating built in.
Backend, APIs & OAuth
04
chrome.identity OAuth flows, secure backend integration, license validation, subscription and freemium gating, and chrome.storage.sync for cross-device state — the secure plumbing behind every serious extension.
Cross-Browser Builds
05
One codebase shipping to Chrome, Edge, Brave, Opera, and Vivaldi, plus Firefox via the WebExtensions polyfill — per-browser manifest variants and store-specific submission packages included.
Web Store Publishing & Maintenance
06
Chrome Web Store submission, permission justifications, privacy disclosures, ASO, and appeals — plus retainer support that tracks quarterly Chromium policy updates and hotfixes fast.
Need to combine multiple extension services into one engagement?
Why Partner with Us?
The Product Value of a Real Chrome Extension Partner
What you get when policy expertise, Manifest V3 engineering, and cross-browser delivery are owned by one senior extension team.
Web Store Approval, First Try
01
A 98% first-submit approval rate. We know the permissions that trigger review, how to justify them, and how to satisfy the single-purpose policy — so you launch in days, not months of appeals.
2-3x Faster to Launch
02
Senior developers who have shipped 160+ extensions skip the discovery loops. We reuse battle-tested Manifest V3 architecture and compress your timeline without cutting corners.
Higher Ratings & Retention
03
Fast, lightweight extensions that do not drain batteries earn better reviews and keep users installed. Rating and retention are engineered in, not left to chance.
Secure & Policy-Compliant
04
Minimum permissions, CSP-compliant resources, secure cross-context messaging, and audited dependencies — so you pass review and protect your users and your brand.
Survives Chrome Updates
05
Chrome ships every 4 weeks. We track Chromium policy and API changes, test on Canary and Beta, and hotfix before your users ever hit a broken build.
A Real Distribution Channel
06
An extension is not just a tool — it puts your product inside 3.5 billion browsers, adjacent to the URL bar and active on every page. We build it to compound that reach.
Ready to unlock these benefits for your extension?
Our Process
From Idea to Web Store in 6 Proven Steps
A battle-tested methodology that ships Chrome extensions on time, on policy, and on rating — across productivity, SaaS, AI, and enterprise builds alike.
Discovery
Use case & policy audit
Design
Popup, panel & flows
Development
Manifest V3 build
Cross-Browser
Edge / Brave / Firefox
Submission
Web Store + appeals
Launch & Support
Updates & user reviews
Want to see how this process maps to your extension idea?
Technology Stack
Our Chrome Extension Technology Stack
The full Chromium extension ecosystem — every API, framework, and browser we build on.
Web & Backend
Next.js / React
Node.js / Vue
Python / Django
.NET / Java
TypeScript
Mobile & Cross-Platform
Swift / iOS
Kotlin / Android
React Native
Flutter
Ionic / HarmonyOS
AI / ML / Data
OpenAI / Claude
Gemini / Qwen
PyTorch / TensorFlow
Hugging Face
SageMaker / Vertex AI
Ecommerce & CMS
Shopify / Plus
BigCommerce
WooCommerce
Magento / OpenCart
Webflow / Framer
Cloud & DevOps
AWS / GCP / Azure
Docker / K8s
Terraform / IaC
GitHub Actions / CI
Datadog / Grafana
Technology Stack
Our Chrome Extension Technology Stack
The full Chromium extension ecosystem — every API, framework, and browser we build on.
Web & Backend
Next.js / React
Node.js / Vue
Python / Django
.NET / Java
TypeScript
Mobile & Cross-Platform
Swift / iOS
Kotlin / Android
React Native
Flutter
Ionic / HarmonyOS
AI / ML / Data
OpenAI / Claude
Gemini / Qwen
PyTorch / TensorFlow
Hugging Face
SageMaker / Vertex AI
Ecommerce & CMS
Shopify / Plus
BigCommerce
WooCommerce
Magento / OpenCart
Webflow / Framer
Cloud & DevOps
AWS / GCP / Azure
Docker / K8s
Terraform / IaC
GitHub Actions / CI
Datadog / Grafana
Industries We Serve
Chrome Extension Expertise Across Every Vertical
Deep domain knowledge across the categories where browser extensions move the needle — from SaaS and sales to enterprise IT.
Fintech & Banking
Payments, KYC, regulatory tech
Healthcare & HealthTech
HIPAA, telehealth, clinical SaaS
Retail & E-Commerce
DTC, B2B, marketplace, headless
EdTech & Learning
LMS, course platforms, proctoring
Manufacturing & Industrial
IoT, predictive maintenance, MES
Logistics & Supply Chain
Routing, fleet, warehouse, B2B
Legal & LegalTech
Document AI, contract analysis
Media & Entertainment
Streaming, content AI, audience
We understand your vertical. Let's build an extension users actually keep installed.
Why Choose Us?
How We Compare To Alternatives
An honest look at your Chrome extension development options.
| Capability | Freelance Dev | DIY / In-House | Cheap Agency | Stallyons Technologies |
|---|---|---|---|---|
| Native Manifest V3 Expertise | Hit or Miss | ✕ Learning Curve | ✕ V2 Ports | Native V3 |
| Web Store First-Submit Approval | Trial & Error | ✕ Guesswork | Frequent Rejects | 98% First Try |
| Cross-Browser (Edge/Brave/Firefox) | ✕ Chrome Only | ✕ Chrome Only | Extra Cost | One Codebase |
| Service Worker Architecture | Varies | ✕ Buggy | ✕ Flaky | Rock-Solid |
| Security & Permissions Hygiene | Sometimes | Over-Scoped | ✕ Risky | Minimum Scope |
| OAuth & Backend Integration | Basic | In-House Load | ✕ Limited | Full Stack |
| Post-Update Maintenance | ✕ Disappears | Reactive | Paid Add-On | Retainer |
| Enterprise Managed Deployment | ✕ No | Partial | ✕ No | Workspace / MDM |
See the Stallyons difference for yourself
Complete Engagement
Everything You Get with a Chrome Extension Partnership
From Idea to Web Store & Beyond, We Handle It All
Here's everything included when you partner with Stallyons on your extension:
Complete Chrome Extension Package: No Hidden Costs.
Every engagement includes all 8 components above — one contract, one senior extension team, one quality bar. Get a custom quote tailored to your use case, browsers, and roadmap.
🔒 No obligation. We'll deliver a detailed proposal within 48 hours.
Plus, Get These Free Bonuses
Free Extension Audit
A 30-point review of your current extension or idea — Manifest version, permissions, service-worker health, Web Store policy risk, and performance bottlenecks.
Included Free
Extension Roadmap & Estimate
A phased build plan with architecture, browser targets, milestones, a dependency map, and transparent effort estimates — yours to keep.
Included Free
Policy & Permissions Review
For qualifying projects, a pre-submission review of your permissions justification and privacy disclosures — so you clear Web Store review the first time.
Included Free
Risk-Free Partnership
Our Triple Extension Guarantee
We stand behind every Chrome extension engagement with commitments that protect your investment.
01
Manifest V3 Compliant
Every extension we ship is native Manifest V3 — service workers, declarativeNetRequest, and the scripting API — built to survive Chrome’s quarterly policy updates, not lazily ported from V2.
02
Web Store Approval Ready
Permission justifications, privacy disclosures, single-purpose compliance, and promo assets prepared up front. If a rejection happens, we handle every appeal until it ships — at no extra cost.
03
Cross-Browser Compatible
One codebase, tested and packaged for Chrome, Edge, Brave, Opera, and Firefox — with per-browser manifest variants so your extension works everywhere your users are.
Build with zero risk, backed by our Triple Extension Guarantee
Track Record
Engagements That Ship, Scale, and Compound
500+
Projects Delivered
29+
Service Categories
81%
Repeat Client Rate
4.9 ★
Clutch Rating
"We came to Stallyons after burning two years and four vendors on a multi-platform launch that kept slipping. They scoped it end-to-end — web app, iOS, Android, an AI summarization layer, and a Shopify integration — and shipped it in 22 weeks. One team, one budget, one quality bar. We've handed them three more engagements since."
Mark Sawyer
CEO/Founder
PlatinumLED
"Stallyons rebuilt our customer-facing portal, integrated three legacy systems, shipped an AI document analysis pipeline, and brought our compliance posture to SOC 2 — all under one engagement. The senior engineers on the team have shipped at companies five times our size. It's the best vendor decision we've made in a decade."
Mark Sawyer
CEO/Founder
PlatinumLED
FAQ
Frequently Asked Questions About Chrome Extensions
Cost varies with scope, complexity, cross-browser targets, backend integration, AI/LLM usage, and enterprise deployment needs. A simple productivity extension is a very different investment than a multi-browser AI-powered SaaS companion with Stripe billing and chrome.identity OAuth. You get a detailed, transparent estimate after a free discovery call — no sticker shock.
Yes. Google completed the deprecation of Manifest V2 in mid-2024 — V2 extensions no longer install for new users. Every new extension we build is native Manifest V3 from the ground up, and our migrations rewrite V2 patterns properly (service workers, declarativeNetRequest, scripting API) rather than lazily porting them.
A focused single-purpose extension typically runs 4-7 weeks. A SaaS companion with backend integration runs 8-12 weeks. A multi-browser AI-powered extension with billing usually takes 10-16 weeks. Enterprise managed deployments add 2-4 weeks for SSO and policy work. You get accurate timelines during discovery and weekly progress.
Not on first submission, in 98% of our cases. We know which permissions trigger reviewer scrutiny, what belongs in the permissions justification, how to structure the privacy policy, and how to satisfy the single-purpose policy. If a rejection does happen, we handle every appeal and revision until it ships — at no extra cost.
Yes — V2-to-V3 migration is a specialty. We rewrite background pages as service workers, convert blocking webRequest to declarativeNetRequest, replace eval/remote code with bundled logic, refactor persistent state to chrome.storage and IndexedDB, and run full regression testing across dynamic SPAs. We architect properly so the extension actually works in V3’s lifecycle model.
Yes. We build single-codebase extensions that ship to Chrome, Microsoft Edge (rebadged to the Edge Add-ons store), Brave, Opera, Vivaldi, and Firefox (via the WebExtensions polyfill) — with per-browser manifest variants, automated builds, and store-specific submission packages included.
Yes. We build force-installed enterprise extensions deployed via Google Workspace admin policies (ExtensionInstallForcelist), Microsoft Intune for Edge, or MDM — internal tools, compliance helpers, SSO integrations (SAML, OAuth, OIDC), and corporate dashboards that bypass the public Web Store entirely, at Fortune-500 scale.
Yes. Retainer-based support covers Chrome Canary/Beta testing every release, quarterly Chromium policy tracking, emergency hotfix response, Web Store rating monitoring and review responses, and feature-roadmap execution. Chrome updates every 4 weeks — your extension needs an active partner, not a project-and-disappear vendor.
Still have questions? Let's talk.
Schedule an appointment with us today!
Ready to Work With a Chrome Extension Company That Ships?
Get a free 45-minute strategy session with our Chrome Extension Development team. We will audit your idea or existing extension, flag policy risks, and map the fastest path to a Web-Store-approved launch.
