Blaukovitch’s Firefox 140 build for Windows 7 is a remarkable achievement in preserving open-source web technology on legacy systems. While Mozilla officially dropped support for Windows 7 beyond Firefox 115 ESR, this independently maintained port brings the latest Firefox 140 engine to users of older operating systems without requiring kernel extensions or version spoofing. Through rigorous patching, API-level workarounds, and dependency tweaks, Blaukovitch ensures the browser runs natively on Windows 7 and 8, maintaining full compatibility with modern web standards, extensions, and rendering features like WebRender and AV1 playback.
This release highlights Blaukovitch’s deep technical expertise and commitment to software freedom. His Firefox 140 build not only restores functionality but improves performance, unlocks features like WebGPU and advanced sandboxing, and works around barriers that were never meant to be bypassed without corporate resources. By delivering cutting-edge browsing to systems abandoned by mainstream vendors, Blaukovitch empowers users to continue using secure, fast, and modern tools without being forced to upgrade their OS. It’s a shining example of independent development keeping the web open and accessible.
Features:
- Based on Firefox 140.0.2 with full support for Windows 7 and 8, both x64 and x86 architectures
- DRM playback (Widevine) is repaired using a manual or automated patching method for widevinecdm.dll
- Updated system APIs and fixed bugs like kernel64.GetOverlappedResultEx and WindowsStringHasEmbeddedNull
- Performance fixes applied to key components like mozglue.dll and xul.dll, with better sandbox and COM support
- updater.exe and crashhelper.exe are disabled by default, with optional profile and VM optimization tools included
Requirements:
- Windows 7 or later
- This web browser is in Russian by default. You will need to manually change the settings in the browser!
Screenshots:
