The 121.0 version of Firefox Developer Edition for Mac is provided as a free download on our software library. This free Mac app was originally designed by Mozilla. The program belongs to Developer Tools. The file size of the latest installer available is 131.2 MB. Our built-in antivirus scanned this Mac download and rated it as 100% safe.
From the developer:
Welcome to your new favourite browser. Get the latest features, fast performance, and the development tools you need to build for the open web.
Firefox Quantum includes a new CSS engine, written in Rust, that has state-of-the-art innovations and is blazingly fast.
Firefox DevTools now grays out CSS declarations that don’t have an effect on the page.
You may want to check out more Mac applications, such as BandDEK Editor, Firefox Live CD or Firefox, which might be similar to Firefox Developer Edition.