Ctrl+Left Shift Vs. Ctrl+Right Shift = Chrome Justifying

I've been battling with Google Chrome for a while because it keeps messing about with my text entry on web forms. The text justification just goes wrong after I do a certain key combination and until today it completely baffled me.

Finally solved it: Ctrl + left Shift = Left justify. Ctrl + right Shift = Right justify.

I don't really understand this even existing as an option, but I also seem to remember reading about it, thinking it was a good idea and turning it on. Now I can't remember how to turn it off, but as soon as I find out I'll post it here! Grrr.