User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/113.0

Steps to reproduce:

Sort of n/a, I just opened the task switcher on KDE Plasma (thumbnail grid), and obsereved that the logo used for firefox is the wayland logo.

Actual results:

The wayland logo was displayed instead of the firefox logo.

Expected results:

The Firefox logo should be displayed instead of the Wayland logo.

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Thanks for the report! This is either bug 1751153 or bug 1826330.

If you have Debian or Ubuntu, you can install Mozilla's experimental Firefox Nightly debian package (bug 1799516):
It has gotten a proper .desktop file today (bug 1824327) which solves this bug.

$ curl -sSf https://packages.mozilla.org/apt/repo-signing-key.gpg | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/packages.mozilla.org.gpg > /dev/null
$ echo "deb [signed-by=/etc/apt/trusted.gpg.d/packages.mozilla.org.gpg] https://packages.mozilla.org/apt mozilla main" | sudo tee -a /etc/apt/sources.list.d/mozilla.list > /dev/null
$ sudo apt update
$ sudo apt install firefox-nightly
$ xdg-mime default firefox-nightly.desktop x-scheme-handler/https
$ xdg-mime default firefox-nightly.desktop x-scheme-handler/http

With apt-cache search firefox-nightly you can find out which language packs can be installed.
e.g. $ sudo apt install firefox-nightly-l10n-de

Disable the default browser check on about:preferences and don't use it (as it would create a faulty ~/.local/share/applications/userapp-Nightly-*.desktop file).