After creating a fresh installation of Ubuntu 24.04, I installed DEB Firefox from APT by following Mozilla’s instructions from here. But I noticed that it was secretly replaced with Snap Firefox. I was able to verify this by checking the About Firefox page. This is the third time I noticed this.
Maybe it was that i had to install the snap version (or maybe flatpak?) and uninstall theirs, which fixed the crashes. I thought it was a hardware issue for awhile because it was so random.