Turns out this is an issue with the nouveau driver, and trying to use it
to drive an older nvidia GPU (geforce 9400) found in the iMac A1225.
Nvidia's proprietary driver for this card (nvidia-340) is only supported
on Linux Kernel 5.4, so installing Ubuntu 20.04, locking to that kernel
version, and installing the proprietary driver solved the problems.
This had nothing to do with snaps, after all.
We can close this bug.
** Changed in: snapd (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1971707
Title:
Ubuntu 22.04 freezes when opening a new tab on Firefox or Chromium
snaps
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