Hello, I know that enabling Numlock to prevent this. See https://support.mozilla.org/de/questions/882228 but this happens to me anyway ant its so annoying, especially, while typing a huge text and than make this disturbing short cut. I'm now looking for a possibility to disable this short cut, to at least realize the unicode input is not working anymore and have a chance to correct it by enabling num lock, without the very bad experience that I lost everything I typed in the last half or even worse full hour or even more typed in.