This just started happening March 31st. I'm suddenly finding that a lot of typing shortcuts that used to work - hitting the home key to go to the beginning of a sentence, for instance, or being able to hit Enter whilst typing and go to a new line within the window instead of posting instantly, aren't working any long. Neither are the Page Down/Page Up keys, nor scrolling with my mouse pad. I just recently starting using Firefox 4,, but haven't encountered this problem before today. Anyone have any ideas? Because this is really annoying.