While the YouTube search bar is focused, I am able to type characters, but anytime I type a character that the video player uses, the corresponding function is invoked. For example, if I type a "k" into the search bar, the video will pause or play, while also typing a "k." More strangely, If I try to type a space into the YouTube search bar, no space is added to the search string, but the video will play/pause. It almost appears as if Firefox is stuck on focusing the video. I've tried deleting cookies and cache to no avail. This issue doesn't exist at all in Chrome, and I really don't want to change my default browser over something so small.