Created attachment 8930000 [details] default-theme.png With Linux XFCE windowmanager (default dark theme) 4.12, and Firefox default theme enabled, the font of the activated tab header is hard to read. It looks like white text on white background with dark, narrow shadow. Switching to Firefox Dark theme makes the font readable. See screenshots.
I'm having a hard time making sense of this. My best and only guesses are that this is a bug in either that XPFE theme or our widget layer.
Component: Theme → Widget: Gtk
Product: Firefox → Core
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