Created attachment 8651583 [details] Nightly first run - Ubuntu As a result, it's not readable when seen against the light gray background. Expected result: text appears in dark gray (as seen on the bottom part of attached image).
This looks like bug 1187203 but I can't tell if you're seeing this on newer nightlies (and it's a regression from the fix for bug 1187203, maybe?) or if it's a duplicate of bug 1187203. Can you doublecheck?
This seems to be a duplicate. Unfortunately, the Nightly build I’m running from ppa:ubuntu-mozilla-daily was last dated August 17. No wonder the fix isn’t present yet.