Empower Your Business With Custom-Built Browser Extensions.
AppQor designs, engineers, and publishes high-performance browser extensions that live directly inside your users’ daily workflow. From network inspection utilities and CRM side-panels to productivity automation and subscription-backed SaaS add-ons, our extensions strictly follow Chrome Web Store Manifest V3 security and minimum-permission standards.
Verified Delivery Metric
99% Client Satisfaction
Core Engineering Deliverables
- 100% Manifest V3 compliant service workers and declarativeNetRequest rules
- Isolated Shadow DOM content scripts that never conflict with host page styles
- Flexible engagement models: Full Project, Full Time Dedicated, or Hourly Basis
- End-to-end Chrome Web Store, Edge Add-ons, and Firefox AMO review compliance
Core Custom Browser Extension Development Specializations
Purpose-built technical solutions tailored for performance, security, and long-term product scalability.
Full Project Turnkey Delivery
Ideal for organizations with a defined extension specification. We manage architecture, UI popup/side-panel design, background service workers, QA, and official store publication end-to-end.
Dedicated Full-Time & Hourly Extension Engineers
Scale your product engineering velocity with dedicated browser extension specialists available on a full-time monthly retainer or flexible hourly basis for Manifest V2-to-V3 migrations and continuous feature releases.
End-to-End Capabilities & Sub-Services
Chrome & Edge Manifest V3 Extensions
Modern Chromium extensions utilizing event-driven service workers, sidePanel APIs, offscreen documents, and strict content security policies.
Firefox & Safari Cross-Browser Porting
Unified WebExtension codebases adapted for Mozilla Firefox Add-ons (AMO) and macOS/iOS Safari Web Extensions via Xcode.
Productivity & Workflow Automation Add-Ons
Custom browser tools that automate repetitive data entry, enrich CRM records, capture structured web clipping, and streamline enterprise operations.
Developer, SEO & Network Inspection Tools
Technical browser utilities for HTTP header inspection, API payload debugging, responsive viewport testing, and real-time DOM auditing.
SaaS Companion & Monetized Extensions
Turnkey SaaS extensions featuring OAuth2/JWT user authentication, Stripe/Paddle license verification, and usage metering.
Manifest V2 to V3 Migration & Store Audit
Refactoring legacy background pages and blocking webRequest listeners into compliant Manifest V3 service workers to prevent store removal.
How We Engineer & Ship Extension Development
Scope, Permissions & Hiring Model Selection
We define the target browsers, required WebExtension APIs, minimum permission scope, and select Full Project, Full-Time, or Hourly engagement.
Popup, Side Panel & Shadow DOM UI Design
Designing compact, high-contrast extension popups, options pages, and non-intrusive in-page overlays.
Manifest V3 & Background Service Engineering
Building message-passing pipelines, encrypted local/sync storage, API integrations, and declarative network rules.
Store Packaging, Privacy Justification & Launch
Preparing production bundles, permission justification documentation, privacy policy disclosures, and publishing to Chrome Web Store, Edge, and Firefox.
Key Business & Technical Benefits
Flexible Hiring Models
Choose between fixed-scope Full Project delivery, Full-Time dedicated engineers, or Hourly consulting tailored to your roadmap.
On-Time Store-Ready Delivery
Structured milestone execution with pre-submission permission audits so your extension passes Chrome Web Store review on the first submission.
Zero Host-Page Conflict
We encapsulate injected UI inside Shadow DOM boundaries and scoped CSS so your extension renders cleanly on any website.
Minimal Footprint & Fast Execution
Event-driven background workers that consume zero idle memory and wake instantaneously when triggered by the user.
Strict Privacy & Permission Hygiene
We request only the narrowest required permissions (such as activeTab or storage) to maximize user trust and pass strict store security reviews.
Global Support & Maintenance
Ongoing compatibility updates as Chromium, Gecko, and WebKit release new browser APIs and security policies.
Production Technology Stack
Frequently Asked Questions About Custom Browser Extension Development
Q1.What hiring models do you offer for browser extension development?
We offer three flexible hiring models: Full Project (fixed scope and milestone delivery), Full-Time Dedicated Developer (embedded with your team monthly), and Hourly Basis (ideal for Manifest V3 migrations, feature additions, or code audits).
Q2.Why is Chrome Manifest V3 compliance critical in 2026?
Google Chrome and Chromium-based browsers require Manifest V3 for all new and existing extensions. Manifest V3 replaces persistent background pages with event-driven service workers, forbids remotely hosted code, and enforces declarative network rules for improved security and performance.
Q3.Can a single extension codebase work on Chrome, Edge, Firefox, and Safari?
Yes. Using the standardized WebExtensions API and browser-polyfill adapters, approximately 90% to 95% of the TypeScript and UI codebase can be shared across Chrome, Microsoft Edge, Mozilla Firefox, and Apple Safari.
Q4.How do you prevent Chrome Web Store rejections during review?
Most rejections occur due to overly broad host permissions, unclear single-purpose descriptions, or missing privacy disclosures. We adhere to the principle of least privilege, bundle all scripts locally, and provide complete permission justifications and privacy policy pages.
Q5.Can we monetize our browser extension as a recurring SaaS product?
Yes. We integrate secure OAuth2 user accounts, license verification endpoints, freemium usage tiers, and Stripe or Paddle subscription billing directly into your extension workflow.
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