User Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:29.0) Gecko/20100101 Firefox/29.0 (Beta/Release) Build ID: 20140428194004 Steps to reproduce: Labtop: Asus M2400, 512MB RAM, Pentium M "Banias" using "forcepae". OS: Xubuntu 14.04, all updates up to May 1, 2014. Application: Firefox 29, version "29.0+build1-0ubuntu0.14.04.2" Updated Firefox to Firefox 29 by automatic software update. Restarted firefox, now all the HTTP address entries in the address box are unreadable; it looks like they are masked by a black or grey/black mask. This independent of address and website. I tried firefox "save mode" and resetting firefox, but none of them corrected the problem. I have no "add ons" loaded. I have also reported the problem to Xubuntu (https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1314924, "Adressbox Entries unreadable: Grey/Black Mask overlaying text")