I don't think I can provide any concrete steps to reproduce the crash, but in all three cases, the browser had been running for 2-3 days and I had at least one "private" window open. I always restore my previous session and generally have around 100 tabs (of which only 10-15 are active) in session. Other than that the issue seems to be random.
This is the first time I'm seeing crashes so the issue seems to be tied to the latest version of the browser as my browsing habits and browser configuration has not changed.
Arch Linux 32-bit ver 27.4.2