LibreWolf 135.0-1 works fine.
Even Dark Reader works on reddit.
Zen 1.7.6 Beta (FF 135-based) works fine.
Some *.js / *.mjs from original omni.ja has problem on Win 7. Omni.ja from FF 134-based Zen 1.7.0 works fine.
SnowFox 134 works fine.
Fixes are as same as for FF 133.
Firefox 136.0 Beta 9 x64 works fine on Win 8.1 and Win 7!
Install language pack from https://releases.mozilla.org/pub/firefox/releases/136.0b9/win64/xpi/
All DLLs are as same as in Blaukovitch's FF 135 x86/x64.