When you take a look at the currently opened Tabs (Windows + Z), the "Close Tab" text is overlapping and is unreadable at times. Posted a screenshot to illustrate the issue. Steps to reproduce the issue: 1) Launch Firefox Metro 2) Select Windows + Z and take a look at the "Close Tab" 3) Open a few new tabs and load several websites (you'll see that its unreadable sometimes depending the sites color scheme)

I added a label to this button in bug 851156, for accessibility, but I didn't mean to make it visible. We hide <toolbarbutton> labels by default but not <button> labels. This patch hides the close-tab <button> label.

Went through the following issue using the latest Nightly build from the following location: http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2013-03-20-03-11-03-mozilla-central/ - Opened several different tabs and made sure the "Close Tab" was not appearing - Ensured that pressing the "X" on the tabs closed them without any issues - Ensured that the start page loads when all the tabs have been closed using the "X" - Pressed the "X" on the start page and made sure it re-opens the start page without issues