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I use KDE (Kubuntu 14.04), the Oxygen theme and Firefox, and FF46 has several bugs with GTK3, the most annoying being displaying tooltips as dark text over a barely darker background.

So I'am looking for a temporary change in them settings to either have the text in white (but I think the problem is that FF46 isn't using the theme color) or having a lighter background.

As far as I can't tell the tooltip background is not even a solid color but a vertical gradient, from roughly 60,53,48 at the top to 42,37,33 at the bottom and I cannot relate these to some contents of the theme in /usr/share/themes/oxygen-gtk/gtk-3.0/ (kdeglobals, oxygenrc or the two CSS files).

So, where are these colors defined?

  • Try looking at gtk.css: I have a line with @define-color tooltip_bg_color #333333;. See if changing the hex value helps. – DK Bose Jun 6 '16 at 17:10
  • This line is not in my gtk.css, and adding it completely wrecks the display... – xenoid Jun 6 '16 at 20:43
  • Same here. Someone says the problem fixed in FF47. Let's wait a bit for it appear in the repository, and see. – Hi-Angel Jun 8 '16 at 4:51
  • @Hi-Angel: I hope so, because that's not the only problem with FF46 (it hoses the file selector, too....). But I tried the other themes and I don't like their looks. Btw, thx for introducing me to Kubuntu Forums, they look a bit more active than the KDE ones. – xenoid Jun 8 '16 at 12:01
  • Well, just if anybody interested: although upgrading to FF47 didn't help, but upgrading distro 14.04 → 16.04, did help. I guess, there were some themes fixed. – Hi-Angel Jun 23 '16 at 22:49
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You can change the colour in the System Settings, which will fix it for all applications, not just Firefox.

On Kubuntu 14.04 LTS: System Settings > Application Appearance > Colours (side selection) > Colours (the tab) > Tooltip Background and Tooltip Text

  • Yes, that what I did three weeks ago :) – xenoid Jul 30 '16 at 18:01
  • It does not fix it for me in Kubuntu 14.04.5 LTS, on Firefox 48... – kavadias Sep 13 '16 at 3:00

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