Firefox Extension Development Agency

Mozilla Firefox Extension Development

We build cross-platform WebExtensions for Mozilla Firefox — leveraging background event loops, sidebar action APIs, and secure AMO store publishing.

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Direct Desk: software@trustoryx.digital

Firefox AMO

Verified Builds

Native

Sidebar APIs

Cross-Browser

Shared Code

Strict

Safety Audits

Growth Obstacles

Problems This Solves

Struggling to support both Manifest V3 and Firefox's unique WebExtensions API architecture changes.

Firefox extension gets rejected by Mozilla reviewers (AMO) due to remote code execution blocks or strict safety audits.

Your browser extension popup layout breaks on Firefox due to CSS rendering differences compared to Chrome.

Inefficient sidebar integrations causing high CPU cycles and browser interface lag on Linux and Windows.

Methodology

Our Proven Process

WebExtensions Setup

We design Firefox-compatible manifests supporting background pages and custom sidebar panels.

React Sidebar UI

We build beautiful sidebar panels and options windows using React and Webpack configs.

Tab & Background Messaging

We write asynchronous message passing systems to link components, tabs, and services.

Mozilla Security Auditing

We inspect codebases to strip out remote executions and verify strict compliance with safety rules.

AMO Store Publishing

We package the extension, submit it to Mozilla Add-ons (AMO), and manage validation feedback.

WebExtensions Setup

We design Firefox-compatible manifests supporting background pages and custom sidebar panels.

React Sidebar UI

We build beautiful sidebar panels and options windows using React and Webpack configs.

Tab & Background Messaging

We write asynchronous message passing systems to link components, tabs, and services.

Mozilla Security Auditing

We inspect codebases to strip out remote executions and verify strict compliance with safety rules.

AMO Store Publishing

We package the extension, submit it to Mozilla Add-ons (AMO), and manage validation feedback.

Scope of Work

What's Included

AMO-compliant Firefox WebExtension zip package files

React/TypeScript layout modules for popup screens and native sidebar menus

Optimized background script modules controlling event status loops

Secure API connector layers linking Firefox storage with backend databases

Pre-submission source code validation and audit checklist reports

Mozilla AMO graphic templates and product listing copy write-ups

30-day post-launch support and Mozilla API security patch updates

Growth Targets

Expected Results

100% compliant Firefox extension passing AMO safety and code audit checks

Responsive, fluid sidebar designs utilizing Firefox native panel modules

Zero remote script references ensuring fast reviewer validation times

Seamless UI rendering matching standard Firefox dark and light styles

Shared cross-browser codebase matching Chrome/Edge extension API schemas

Tech Stack

Technologies We Master

Mozilla WebExtensions

React

TypeScript

browser-polyfill

Webpack

AMO Publisher

Node.js

Exhaustive Solutions

Comprehensive Capabilities

We don't just scratch the surface. Here is a detailed breakdown of everything we can engineer, optimize, and execute for your business.

Firefox Sidebar APIs

Building persistent tool panels that load on the side of the browser.

AMO Security Compliance

Refactoring JavaScript structures to meet Mozilla strict source code review mandates.

WebExtensions Polyfills

Using standard API wrappers to run unified extensions on Chrome and Firefox.

Asynchronous Message Passing

Structuring promise-based event streams between sidebars, tabs, and background scripts.

AMO Publisher Submissions

Managing AMO signatures and zip packages configuration for secure web deployments.

Local Storage Sync

Persisting user settings and application states across sessions using storage APIs.

Specialized Focus

Specialized Services

Explore our specialized engineering teams and tailored solutions for this domain.

Software Development

Custom digital product engineering.

Browser Extensions

Cross-browser extension development.

Chrome Extensions

Chrome Web Store extension setups.

API Development

Robust public backend APIs.

Transparent Pricing

Investment Plans

Transparent pricing with no hidden fees. Every plan includes dedicated support and monthly reporting.

Firefox MVP Extension

$2,500USD · USD fallback/starting

Single popup/options page tool, background scripts, standard API integrations, and AMO store submissions.

WebExtensions manifest setup

Single popup UI screen

Background worker scripts

Least-privilege permissions design

Firefox AMO store submission

Local storage integration

14-day post-launch support

Single browser targeting

Build Firefox MVP

Firefox Sidebar Tool

$5,500USD · USD fallback/starting

Native Firefox sidebar panel integration, custom React interfaces, persistent tab states, and Stripe payment wrappers.

Includes all Firefox MVP features

Native Sidebar API configuration

Persistent tab state management

Stripe subscription connector

React options page dashboards

Chrome and Edge port scripts

30-day active design support

AMO validation assistance

Deploy Sidebar Tool

Enterprise Cross-Browser Suite

$12,000USD · USD fallback+/project

Unified codebase targeting Chrome, Edge, and Firefox, advanced scraping workflows, priority SLA support, and 60 days support.

Unified cross-browser codebase

Polyfill compatibility layers

Advanced automation scrapers

Custom server database sync

Dedicated weekly strategy calls

SLA-backed priority consulting

60-day post-launch support

24/7 Slack developer channel

Build Cross-Browser Suite

All plans are month-to-month with no long-term contracts. Custom enterprise plans available.Contact us for a tailored proposal.

Why Trustoryx

Why Choose Us

No Long-Term Contracts

Month-to-month engagements. We earn your business every single month.

Dedicated Team

A named strategist, not a rotating cast of juniors. Consistent point of contact.

Revenue-Focused

We report on revenue impact, not vanity metrics. Every dollar is attributed.

Rapid Execution

Strategy in week 1. Execution by week 2. Results tracked from day one.

Support

Frequently Asked Questions

Yes, Firefox supports Manifest V3 while maintaining compatibility with key features like blocking WebRequest API, ensuring powerful functionality.

Firefox has a native Sidebar API that allows developers to run a persistent panel on the side of the browser window. This is perfect for utility apps.

Mozilla enforces strict security checks. They audit uploaded packages to confirm no remote scripts or obfuscated minified codes are executing.

Yes, we use the standardized WebExtensions API wrapper so that over 95% of the code is shared between the two extensions.

Ready to Get Started?

Start with a free audit. We'll analyze your current performance and show you exactly where the growth opportunities are.

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Or email our dedicated desk: software@trustoryx.digital