Some people miss this but Librewolf uses most of the code from Firefox...so its still VERY dependent upon Firefox developers/services to do its thing. Its still better, but if Firefox suffers, then Librewolf does too.
Theres an excellent graphic here: https://codeberg.org/librewolf/source
I used to compile and contribute a long time ago. Its pretty easy to get it working and make adjustments...when you know what Firefox does in the background.
