Software & App Development

Chrome Extension Development Company

Custom Manifest V3 extensions, AI copilots, and workflow scrapers built for security, background performance, and seamless Chrome Web Store approval.

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Who brings us browser extension projects

You need a purpose-built browser tool that interacts with web pages or brings your software directly into the user's workflow, without risking security rejections or fragile page breaking.

  • SaaS founders expanding their web platform with an in-browser companion copilot or sidebar tool
  • Operations and research teams needing custom web scrapers and data-entry automations across internal portals
  • Agencies and product teams looking to hire chrome extension developer experts for client deliverables

Manifest V3 extensions built for performance and security

We design and engineer custom browser extensions for Chrome, Edge, and Chromium browsers: workflow copilots, web scrapers, automation tools, and SaaS companion utilities. Modern browser development demands strict Manifest V3 compliance, moving background logic from persistent background pages to event-driven service workers while handling content script isolation and strict Content Security Policies. Whether you want to hire chrome extension developer talent for ai chrome extension development or build an enterprise sidebar tool, our experienced engineers direct architecture, security reviews, and store release approvals while AI coding agents accelerate implementation. We assist with Chrome Web Store submission, scoped permissions, and secure token storage so your extension functions reliably without risking user privacy.

AI-assisted, expert-led browser extension engineering

How AI assists

  • Scaffolding Manifest V3 manifests, boilerplate communication channels, and offscreen document scripts from scoped technical tasks
  • Generating initial DOM parsing, selector extraction, and page automation scripts across different website structures
  • Drafting unit and mock-browser integration tests for extension messaging, popup views, and background worker handlers
  • Drafting extension build configurations, bundle minimization scripts, and localized metadata files for store listings

What our experts own

  • Engineers design the extension architecture, service worker lifecycle state management, and permission boundaries before writing code
  • Security specialists audit Content Security Policy settings, OAuth token storage, and third-party API communication to prevent injection risks
  • QA specialists validate asynchronous message passing, tab reloads, browser permission prompts, and offline behavior across Chromium browsers
  • Engineers review store review policy compliance, manage packaging keys, and control submission to the Chrome Web Store and Edge Add-ons

What you receive

What we deliver for your browser extension

  • Manifest V3 compliance

    Built from the ground up on Manifest V3 using event-driven background service workers, offscreen documents, and declarative net request rules.

  • AI copilot and LLM integration

    In-browser contextual AI copilots that summarize pages, generate text, or automate user workflows via streaming backend or model APIs.

  • DOM scraping and automation

    Robust content scripts for contextual data extraction, form automation, and page interaction designed to handle dynamic single-page applications.

  • Secure authentication and storage

    OAuth sign-in flows with chrome.identity, session sync with your SaaS platform, and secure encrypted storage for sensitive user tokens.

  • Sidebar, popup and injected UI

    Responsive popup panels, side panels via the Chrome Side Panel API, and isolated Shadow DOM injected overlays that do not break page styles.

  • Store packaging and review support

    Clean production packaging, privacy policy guidance, minimal permission scoping, and hands-on support through the Chrome Web Store review process.

Where each part of your browser extension runs

Illustrative architectural split for a Manifest V3 extension; actual distribution follows your specific workflow and privacy requirements.

  • In the browser content script and UI

    • Popup interface, side panel view, and options pages built with modern UI components
    • Isolated Shadow DOM overlays injected directly into target web pages
    • Content scripts reading webpage DOM elements and listening for DOM events
    • No private secret keys: any code or variables in content scripts can be inspected

  • On the background service worker

    • Event-driven background listeners that activate on web navigation or user actions
    • Inter-component message routing between popup, side panel, and content scripts
    • chrome.storage management and state synchronization across browser restarts
    • Offscreen documents for DOM parsing tasks unavailable in service workers
    • chrome.declarativeNetRequest rules for header and network request handling

  • On your backend API and external services

    • Your SaaS application backend and databases, reached via authenticated endpoints
    • AI model inference endpoints and private LLM keys, safely kept off client machines
    • OAuth authentication servers validating session tokens and user subscriptions
    • Chrome Web Store Developer Dashboard and update servers managed under your account

Typical browser extension requests

Typical scenarios we scope, not client case studies.

  • AI sidebar copilot for customer support

    A support team wants an extension that reads open ticketing pages, queries company knowledge via an API, and drafts contextual replies in a side panel. We build a Manifest V3 side panel extension with secure OAuth authentication and API streaming.

  • Workflow scraper and lead enrichment tool

    A sales platform needs a custom browser extension agency to build a tool that extracts structured prospect information from web directories and pushes it to their CRM. We build isolated content scripts and robust background messaging that respect target site changes.

  • Enterprise internal tool enhancer

    An enterprise uses a legacy internal web app and needs custom keyboard shortcuts, autofill features, and security banners injected on specific internal URLs. We build a permission-scoped extension deployed privately via Chrome Enterprise policies.

How an extension project runs

  1. 01

    Discovery and permissions architecture

    We review required browser capabilities, target websites, third-party APIs, and permissions, then agree on the architecture and AI engineering package.

  2. 02

    Interface and interaction design

    Designers craft clean popup layouts, side panels, or on-page overlays, ensuring clear user interactions and seamless UX within the browser frame.

  3. 03

    Manifest V3 build, testing and code review

    Coding agents implement scoped modules while engineers review every pull request and QA tests messaging across real browser profiles and tab lifecycles.

  4. 04

    Store submission and post-launch updates

    We prepare store assets, manifest packaging, and review disclosures, guiding your listing through Chrome Web Store approval with optional support plans.

Two ways to work with AI tools

Choose where AI coding agents may process your code while we build. The engineering standard is the same either way.

Not sure? We'll recommend one during scoping. Compare AI delivery options

How security, UX and store compliance connect

  • Zero unnecessary permissions

    We request only the host permissions and browser APIs strictly needed. Over-permissioned extensions face user distrust and lengthy store review delays; minimal scoping protects approval.

  • Resilient service worker lifecycles

    Manifest V3 service workers terminate when idle. Our engineers architect persistent state using chrome.storage and alarms rather than fragile in-memory global variables.

  • Isolated UI via Shadow DOM

    Injected UI components run within isolated Shadow DOM boundaries so host website stylesheets cannot alter your extension's design, and extension styles cannot break customer pages.

  • Human-reviewed store compliance

    AI tools speed up coding, but senior engineers verify compliance against strict Google Chrome Web Store Developer Program Policies before any package is uploaded.

Not part of an extension project

  • Full standalone web applications, databases, or public customer portals are scoped separately under Web Design & Development or SaaS & MVP Development.
  • Native mobile applications for iOS and Android require separate codebase architectures and belong under Mobile App Development.
  • Remotely hosted executable scripts injected at runtime are banned under Manifest V3 and will not be built; all extension logic must be packaged within the extension.
  • Work aimed at bypassing website paywalls, scraping copyrighted content without authorization, or violating third-party platform terms of service.

FAQ

Frequently asked questions

Why is Manifest V3 compliance important for new Chrome extensions?

Manifest V3 is Google's required standard for browser extensions. It replaces persistent background pages with ephemeral service workers, restricts remotely hosted code, and alters how network requests are modified. As a manifest v3 developer team, we build compliant architectures from day one to ensure fast performance and avoid store rejections.

How do you handle API keys and AI models inside browser extensions?

Browser extension code can be unpacked and inspected by end users. To protect proprietary keys and prevent abuse, sensitive AI model keys or payment logic should never reside in extension client code. We route requests through your secure backend proxy or authenticate users via your SaaS API using scoped OAuth tokens.

Can you help get our extension approved on the Chrome Web Store?

Yes. We prepare the extension package, audit permissions against Google's Single Purpose and Minimal Permissions policies, draft clear rationale justifications for the review team, and help resolve feedback if reviewers request changes. While store decisions rest with Google, compliant engineering minimizes friction.

Where is our proprietary code processed when AI tools are used?

It depends on your chosen package. With Private / Local AI Engineering, models run on your infrastructure or an isolated environment. With Claude Code / OpenAI Codex Engineering, commercial tools run under agreed access terms. In all cases, experienced engineers review every line of code before merge.

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Ready to build your browser extension?

Tell us about your extension concept, required permissions, and web platforms. We will propose a scoped architecture, milestone plan, and development package at https://www.canvasdevelopers.com/contact.

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