Hi @cyber-l,
Do you have Adblock Plus or Adblock Plus Pop-up to blocks javascript?
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).
Do NOT click the Reset button on the Safe Mode start window.
And deactivate all your plugin and try it again.
Thanks
Confirmed. Having the same problem with typist.js crashing Firefox after an extended period.
Currently using Firefox v45.0.2
Looks like typist.js is continuously looping even after you click to other sections of website. Maybe that’s why it’s causing the crash? Please investigate and fix if possible.