By design and by default, snapd won't let you update a snap that has
running apps, because it might result in crashes or unpredictable
behaviours.

Your best bet is to actually ensure firefox is not running before
refreshing it.

Alternatively, if you are an administrator on that machine, you could
try to turn off that default setting (but even that might require
restarting the firefox snap before it actually allows you refreshing
while the app is running):

    snap set core experimental.refresh-app-awareness=false

As I noted above, this might result in unpredictable behaviour of the
running apps that are being refreshed, so use at your own risk, that's
not a setting that I would recommend unless you really know what you're
doing.

** Changed in: firefox (Ubuntu)
       Status: New => Invalid

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Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1985066

Title:
  cannot refresh snap "firefox": snap "firefox" has running apps
  (firefox)

Status in firefox package in Ubuntu:
  Invalid

Bug description:
  Firefox installed via 22.04 snap does not seem to update properly.

  There is a log line (or error printout on manual execution), but it
  does not really point me to the actual bug. I already know firefox is
  running for some other user - that machine is never up and not running
  firefox - but I do not see how that matters.

  # snap list firefox
  Name     Version    Rev   Tracking       Publisher  Notes
  firefox  103.0.1-1  1635  latest/stable  mozillaâś“   -
  # snap info firefox | grep latest/stable
  tracking:     latest/stable
    latest/stable:    103.0.2-1    2022-08-09 (1670) 171MB -
  # sudo snap refresh firefox
  error: cannot refresh "firefox": snap "firefox" has running apps (firefox), 
pids:
         19113,19246,19268,19361,19524,19529,19588,19874,20047,20075,20105,20127
  # firefox --version
  Mozilla Firefox 103.0.1

  (expected: 103.0.2)

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