Yes, sorry. I can confirm the bug exists in 18.04. It is trivial to
reproduce, which is unusual :(

When the screen freezes multiple process start spinning:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
13113 dan       20   0 12.947g 7.897g 7.788g R  91.0 51.5   1:00.90 gnome-shell 
13773 dan       20   0 2169752 277244 142700 S  46.2  1.7   0:17.66 firefox     
13832 dan       20   0 2039840 165760 109716 S  28.6  1.0   0:10.49 Web Content 
13132 dan       20   0 1241100 241772 220172 S  13.3  1.5   0:09.01 Xwayland    

To un-freeze the system I just have to:
killall -9 firefox

This is a scary bug because it's also spinning consuming memory (see the
above list).

I will get the upstream Gnome guys to look at this ASAP.

** Changed in: gnome-shell (Ubuntu)
       Status: Incomplete => Confirmed

** Changed in: gnome-shell (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1749779

Title:
  System freeze when going back and forth fullscreen mode with Firefox

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