Pressing ctrl+tab does not switch tabs when browser.ctrlTab.previews = true
In about:config set browser.
I usually expect releasing ctrl+tab to close the preview and switch tabs.
Instead, the tab preview opens, further presses of ctrl+tab cycle through tabs, but releasing the keys does not close the preview window and change tabs. I can press escape to close the window without switching tabs, and I can click a preview to change tabs, but I can not change tabs just by pressing and releasing ctrl+tab.
I also saw this behavior in the Mozilla nightlies on this machine.
I filed a bug with Mozilla too, but I believe it is Ubuntu-specific: https:/
Description: Ubuntu Vivid Vervet (development branch)