When clicking the "new tab" overlay button on the right edge of the screen in Metro Firefox, I see two new tabs appear instead of one.
This is reproducible only with touch, not with mouse. NavButtonSlider.js performs its own click/drag detection. It calls preventDefault on touchstart to prevent widget clicks, but it appears to receive a click anyway.
Actually, bug 861876 was for win32 (desktop). This is a chrome-only bug in WinRT widget. Taking this.
Created attachment 828681 [details] [diff] [review] it's so beautiful Chrome should use the same logic as content here.
it's so bright and vivid https://hg.mozilla.org/integration/fx-team/rev/36fb3e83f249
Moving the keyword to bug 943451
Verified as fixed with Firefox 28 beta 7 on a Dell XPS 12 ultrabook with Windows 8 64-bit.