Broken add-ons and extensions are also a major issue.
When Firefox is incorrectly installed, it can also crash from time to time.
Mismatched cache and other conflicts of settings can cause Firefox to crash.
It is also possible that the version of Windows 10 you are running is not up to dare.
The Firefox browser could be outdated and may need an update.
Some of the most common include the following There are very many reasons why Firefox may be crashing on Windows 10. Part 1: Why Does My Firefox Keep Crashing?
Part 4: Bonus Tips: Recover Lost Data from PC with Recoverit.