[Bug 1964036] Re: Firefox icon missing from panel following Kubuntu LTS upgrade 20.04->22.04

[Brian Murray]

** Tags added: rls-jj-incoming

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https://bugs.launchpad.net/bugs/1964036

Title:
  Firefox icon missing from panel following Kubuntu LTS upgrade
  20.04->22.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  1) lsb_release -rd

  Description:    Ubuntu Jammy Jellyfish (development branch)
  Release:        22.04

  2) apt-cache policy ubuntu-release-upgrader-core
  ubuntu-release-upgrader-core:
    Installed: 1:22.04.6

  3) expected

  (upgrade from Kubuntu 20.04.3 -> 22.04. Reboot.)

  * Firefox icon on panel to be intact.
  * Clicked icon launches browser.
  * Icon tooltip/mouse hover to describe application.

  4) happened instead

  * Icon is missing/replaced with a generic icon
  * Icon click produces error notification "Plasma Workspace - preferred://browser"
  * Icon tooltip/mouse hover appears, though is blank.

  Additional info:
  * firefox is still installed, works as expected.

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