Sites like Uptodown maintain version histories for Windows and Mac, though using official Mozilla links is generally safer. Step-by-Step Installation Guide
Downgrading is not as simple as running a new installer; Firefox includes to prevent data corruption. Older versions of Firefox Developer Edition (Windows) download older version of firefox developer edition
A classic alternative for direct access to raw files is ftp.mozilla.org/pub/firefox/releases/ . Note that "Developer Edition" builds are often nested within specific version folders or separate directories like /pub/devedition/ . Sites like Uptodown maintain version histories for Windows
Finding and downloading older versions of (formerly known as Aurora ) is a common task for developers who need to test site compatibility, reproduce specific bugs, or maintain legacy extensions. Where to Download Older Firefox Developer Edition Releases Note that "Developer Edition" builds are often nested
Mozilla maintains a public directory of every release. You can find Developer Edition builds specifically at archive.mozilla.org/pub/devedition/releases/ .
The most reliable way to find previous versions is through Mozilla’s official archives rather than third-party sites.