I will build a custom chrome or firefox browser extension

Need a browser extension that actually works and ships to the Chrome Web Store or Firefox Add-ons?

I'm a software developer who has built and published extensions to both stores. My extension Download Buddy is live on the Chrome Web Store and Firefox Add-ons, so I know the full pipeline: development, manifest configuration, store submission, and review navigation.

What I can build:

• Page modifiers (content scripts, DOM manipulation)
• Popup UIs with settings and storage
• Background service workers and event listeners
• API integrations and data fetching
• Tab/URL management and automation
• Cross-browser support (Chrome, Firefox, Edge)

All packages include:

• Manifest V3 compliant code (Chrome's current standard)
• Clean, documented code
• Source files (.zip ready for store upload)

Premium package also includes:

• Chrome Web Store submission on your behalf
• Post-launch support for store review issues

I write clean, modern Manifest V3 code, not the outdated MV2 tutorials floating around online. If you have an old extension that broke after Chrome's MV2 deprecation, I can migrate it too.