Your System Details says you are on Windows 8. But the crash report says: OS Windows 10 OS Version 10.0.10240 ++++++++++++++++++++++++++++++++++ bp-894a792a-adbe-4531-908e-8816e0201219 bp-ed914423-a0fe-4b8f-a9b7-3710b0201219 Signature: OOM | small MOZ_CRASH Reason (Sanitized) : MOZ_CRASH() MOZ_CRASH Reason (Sanitized) : [unhandlable oom] Failed to allocate slots while tenuring. Crash Reason EXCEPTION_BREAKPOINT ++++++++++++++++++++++++++++++++++ bp-2010b0c3-afdd-46a3-b3ab-2a2670201219 Signature: OOM | large | js::AutoEnterOOMUnsafeRegion::crash | js::AutoEnterOOMUnsafeRegion::crash | js::gc::AllocateCellInGC MOZ_CRASH Reason (Sanitized) : [unhandlable oom] Failed not allocate new chunk during GC Crash Reason EXCEPTION_BREAKPOINT

Basically, an OOM (Out Of Memory) means the system is having issues with the RAM. https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding https://support.mozilla.org/en-US/kb/firefox-takes-long-time-start-up https://support.mozilla.org/en-US/kb/quick-fixes-if-your-firefox-slows-down MemTest LAST UPDATED : 12/04/2020 Could you please run a tool from http://memtest.org/ in order to check the integrity of your RAM? You will need a thumb or disk drive to install it on. Do you let Windows handle the page file or did you set a fixed size ? If you use a fixed size for the page file then try the former and let Windows handle the page file. [https://docs.microsoft.com/en-us/windows/client-management/determine-appropriate-page-file-size#:~:text=Support%20for%20system%20crash%20dumps%20%20%20,on%20kernel%20virtual%20memory%20usage.%20%20...%20 How to determine the appropriate page file size for 64-bit versions of Windows] {web link}