What extension development includes

Browser extensions combine product UI, permissions, runtime behavior, store policy and often a backend. A development scope needs to make those boundaries explicit so the owner knows what is being built and how it will be maintained.

NEW PRODUCT

Custom extension development

Translate the product brief into browser surfaces, permissions, runtime logic, APIs, testing and store-ready delivery.

MODERNIZE

Manifest V3 migration

Review background behavior, service workers, content scripts, permissions and APIs for a maintainable Chromium architecture.

DISTRIBUTE

Cross-browser adaptation

Assess Chrome, Microsoft Edge and Firefox compatibility, implement necessary differences and test the actual target browsers.

Capabilities

  • Popup, options, side-panel and content-script interfaces.
  • Manifest V3 service-worker architecture where applicable.
  • Browser APIs, permissions and messaging.
  • Backend/API integration, authentication and remote configuration.
  • Chrome-to-Microsoft Edge adaptation and Firefox compatibility review.
  • Store package preparation, technical documentation and release support.
  • Maintenance, issue diagnosis and scoped product improvements.

Project stages

  1. Define the scope. Record user value, target browsers, store category, permissions, data flows, APIs and acceptance criteria.
  2. Plan the architecture. Separate browser UI, runtime, backend and external dependencies into reviewable delivery points.
  3. Build the extension. Create semantic, accessible interfaces and maintainable logic for the agreed browsers.
  4. Test the result. Check core flows, permissions, upgrades, failure cases and browser-specific behavior.
  5. Hand off the project. Deliver the agreed source, documentation and release materials; the store retains final approval authority.

Ownership and responsibilities

The project brief should state who owns store accounts, domains, vendor accounts, credentials, legal text, privacy decisions, backend hosting and post-handoff maintenance. Secrets should remain in owner-controlled systems rather than being embedded in source or transfer documents.