Cursor on Firefox?
Press F7! Its a feature and an annoying one until you know about it. Its called "caret browsing." Well its been around for a long time..but I noticed it until recently, when I changed my keyboard for mercy of my hands and started pressing all the wrong keys! :)
More here: http://en.wikipedia.org/wiki/Caret_navigation
More here: http://en.wikipedia.org/wiki/Caret_navigation