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Not able to resize Firefox (when sized via KWin)?
(slrpnk.net)
A place to discuss the news and latest developments on the open-source browser Firefox
This won't help you, but I wanted to chime in and say that I do not experience this bug. OS is Nobara, KDE 6, FF from repo. I have a KWin command to open FF with a specific size at a specific location and can resize it just fine.
Bazzite is still on KDE 5, can't wait for the update! Will probably fix this too. Thanks for sharing though 🌻