Browser shortcuts Ctrl+TAB and Ctrl+L should not be used
Userecho uses the keys for formatting the text. Imo the keys are very annoying, because they block standard keys in IE and FF. The same is true for Ctrl+Shift+TAB. The keys should be changed to something, which doesn't conflict with standard shortcuts.
We have checked Ctrl-Shift-TAB sequence and in has priority over editor, we try it using latest Firefox and IE and it's switch between tabs.