Gah. Your tab just crashed. How do I know what made the tab crash?

I am using Firefox Quantum (57.0.1) on Bunsenlabs Hydrogen (Debian Jessie with Openbox). For some pages, (namely, Panopticlick's result page), the tab start to load, and crash. All I then get to see is a white page with Gah. Your tab just crashed. We can help! Choose Restore This Tab to reload the page. I ve tried to open the console and reload the page, but it get cleared as soon as the tab crash, and go to about:crashes, but it only seems to only account for full-on firefox crash, tab crash doesn't get reported. At the very least the list was empty for me. I sometime encounter pages that don't work properly, since I use uBlock Origin and uMatrix, so usually, when I really need a page and I can't get it to work in firefox, I just use chromium, but in this case, the whole point is to test firefox, so this workaround just don't work. What can I do to have information on the crash? So I can then attempt to fix the problem myself, or ask for help?