The attachment reminder notification bar's text has low contrast. First bad Daily: 20150824 (43.0a1) This got mitigated for Thunderbird 45 in bug 1245926 (switch back to gtk2). comm-central contains only a blocklist update: https://hg.mozilla.org/comm-central/pushloghtml?fromchange=7965091ed556&tochange=01a3c10a11d3 Regression range for mozilla-central: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=22c34579ae0720e7d3dc39a22b9d33f13bc0198b&tochange=8a6045d14d6bd348a3b5bfeb55a9321e680cc93e So this is a regression from bug 1187203. There might be similar issues in the codebase. The general GTK2 to GTK3 bug is bug 627699.

We use the plain rule from https://dxr.mozilla.org/mozilla-central/source/toolkit/themes/linux/global/notification.css#7 I could override it with color: inherit; but I think this is a issue of the GTK integration which chooses the wrong color for -moz-gtk-info-bar-text. Should this bug not move to toolkit?

Ambiance chooses low contrast colors for info bars, and Gecko is succeeding in using the same colors as the theme. Fortunately this means that a different GTK theme can be selected and Gecko will use that.

(In reply to Richard Marti (:Paenglab) from comment #1) > Should this bug not move to toolkit? Your decision, you have more expertise with this. (In reply to Karl Tomlinson (:karlt) from comment #2) > Ambiance chooses low contrast colors for info bars, and Gecko is succeeding > in using the same colors as the theme. This applies to notification bars with type="warning", but not with type="info" (like the datareporting notification in the second session after profile creation uses - it's high contrast). To see such a notification bar in Firefox Nightly, go to http://www.popuptest.com/popuptest4.html and move the mouse over the link.

(In reply to Sebastian Hengst [:aryx][:archaeopteryx] (needinfo on intermittent or backout) from comment #3) > > To see such a notification bar in Firefox Nightly, go to > http://www.popuptest.com/popuptest4.html and move the mouse over the link. This is a good example for Firefox. Moving to toolkit.

(In reply to Karl Tomlinson (:karlt) from comment #2) > Ambiance chooses low contrast colors for info bars, and Gecko is succeeding > in using the same colors as the theme. Please file these kind of issues at https://launchpad.net/ubuntu-themes. I know the theme is almost orphaned by Canonical, but hopefully the external pressure will make them wake up.