check this out :-https://support.mozilla.org/en-US/kb/Mozilla%20Crash%20Reporter?esab=a&s=crash&r=0&as=s

Guess I forgot to include crash reports. This is on my work computer, but same error. I'll post more crashes later. https://crash-stats.mozilla.com/report/index/c60cd329-1fed-420f-a448-288c82140207

This is an OOM (out-of-memory) issue as you can see by the signature of the crash report.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Same crash in safemode https://crash-stats.mozilla.com/report/index/590bc314-eaee-4a70-982e-d57122140210

Also I've already tried the above (Safemode, disabling hardware acceleration etc)

Is this with the 32 bit Nightly build or with the 64 bit build?

The 64 bit Nightly build for Windows is only generated to test for compilation errors and doesn't undergo all the tests that other builds get, so the risk that something goes wrong can be quite high.

32-bit from nightly.mozilla.org

Another crash from a different computer (This one not in safe mode) https://crash-stats.mozilla.com/report/index/ff85762c-bd3c-4651-8b50-d35dc2140210

better use safe mode for starting fx browser