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In Kubuntu 23.04 the option to hide the titlebar is missing:

enter image description here

This happens with version 114.02, be it local ("portable"), snap, or mozilla-team PPA version. The same with beta and nightly (115, 116).

In a "portable" non-snap ESR version (102.12.0esr) the setting is present but it does nothing anymore, although it worked until some time ago.

enter image description here

The older solution of using true for about:config - browser.tabs.drawInTitlebar option doesn't work either.

Is this related to some update in Plasma integration packages for gtk apps or what?

As said in a comment, and as confirmed by me too, on a separate machine that runs Kubuntu 22.04 the problem is absent with latest 114 as well as with latest nightly 116. This looks independent of the Firefox version.

cipricus
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2 Answers2

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In case this won't be fixed or as a workaround:

  • add a window rule to hide the Firefox title bar:

enter image description here

  • install addons that provide the window buttons: maximize (links to the other two at that page)

(There are other addons for buttons, but the above give me the best KDE integration.)

I think this new configuration looks and acts even better than the old one!

enter image description here

cipricus
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A somewhat workaround/hack is to right click on the title bar and select Un/Decorate. This will remove the title bar, but it will also remove the minimize, maximize, and close buttons along with it.

slacle
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