Extension Dev Lab

3 listings we've seen · as of 4 Oct 2026. This is the maker name shown on the store, not proof of who owns the company.

Workflow & Planning

Convert and save Gmail emails as PDF files with one click. Download your emails locally for secure and private message backup.

Developer Tools

Check Core Web Vitals and compare metrics for desktop and mobile devices. Check pagespeed insights using our Chrome extension.

Tools

Install RAR File Opener and extract RAR archives in your browser. Open RAR files on Mac OS and Windows 10/11. No WinRAR needed.