Hello!
on my own librem 11, that went back because of memory problems, firefox was not usable due to repeating crashes, besides beeing a prehistoric version…
now i am running on the librem11 of my father, and its exactly the same, firefox is not usable, it crashes all the time, is there any fix to this? or a reasonably modern version of firefox?
As Firefox Opensource is not good anymore you may use Whatever browser to jump the crash.
If still want to stay with FF, launch FF debugging on console to see what going on.