I'm seeing similar problem. The only solution I found is to close and
reopen browser.

snap    2.48.3+20.10
snapd   2.48.3+20.10
series  16
ubuntu  20.10
kernel  5.8.0-41-generic

dasm@dell:~/git/canonical$ sudo snap get system 
experimental.refresh-app-awareness
error: snap "core" has no "experimental" configuration option
dasm@dell:~/git/canonical$ sudo snap get core experimental.refresh-app-awareness
error: snap "core" has no "experimental" configuration option
dasm@dell:~/git/canonical$ sudo snap set system 
experimental.refresh-app-awareness=true
dasm@dell:~/git/canonical$ sudo snap get system
Key           Value
experimental  {...}
refresh       {...}
seed          {...}

I'll report back if I'm still seeing issues with this behavior.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1914918

Title:
  The snap being updated in the background causes both old and new tabs
  to die to SIGTRAP

Status in chromium-browser package in Ubuntu:
  Confirmed
Status in snapd package in Ubuntu:
  Confirmed

Bug description:
  The last few background updates of chromium have made some old tabs
  suddenly crash with SIGTRAP and it also makes it impossible to open
  new tabs, those die instantly with a SIGTRAP as well.

  This is incredibly destructive to whatever might be the dying tabs'
  unsaved state and there's no warning about it. Yet again a snap-
  related change rolled out to users with absolutely amateur-tier
  testing.

  Ubuntu: 20.04.2
  Snap: 2.48+20.04
  Chromium: 88.0.4324.150

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1914918/+subscriptions

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