Build Identifier: http://hg.mozilla.org/mozilla-central/rev/e1a40027dc7e Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120504014349 Tabbing and Shift-tabbing to move focus does notwork in Latest Nightly hourly. Reproducible: Always Steps to Reproduce: 1. Open about:home or any web page. and also any Browser UI 2. tab / shift+tab Actual results: Nothing happens Expected results: Move focus Regression window: Works: http://hg.mozilla.org/integration/mozilla-inbound/rev/a6a335cd2c94 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120503010011 Fails: http://hg.mozilla.org/integration/mozilla-inbound/rev/de5745bce8bc Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120503013602 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=a6a335cd2c94&tochange=de5745bce8bc Regressed by: Bug 166240

Maybe Windows specific problem