Bit of a strange one this, and one I've only noticed lately.
When I'm typing, one of the keyboard shortcuts I use is ctrl+shift+left arrow to select an entire word at once, instead of using shift+left arrow to select one letter at a time.
However, when I'm typing a post here, and try to use the same shortcut, it doesn't work. Nothing at all happens actually, no letters are selected. I've the same problem composing a mail on gmail, but in other forums it works fine.
Just wondering if it's a known issue in firefox, or is it something else?
