I love Firefox and NEVER use Safari. I thought something had happened to my MacBook Air, stuck space bar or maybe even a virus? BUT the space bar issue doesn't occur when I use Safari. The issue is this: I will use Firefox (for everything). All of a sudden, the space bar becomes "engaged" and my text starts scooting across with spaces between it. I can hear it "stutter" a sharp sound each time it lurches along. I can then open up a word doc and the thing follows me there. Or when trying to close an unsaved word doc to prep for closing the computer. I restart the computer and to begin with, the spacebar issue is resolved but before long (sooner and sooner) it begins again to the point that I am restarting my computer now within about five minutes. I have uninstalled and re-installed Firefox to no avail. BUT, I can use other programs without problem as long as the problem hasn't already begun again, via Firefox. What on earth? I am now stuck using Safari... I have the most recent Firefox installed. I just re-installed the program a second time, yesterday. I don't want to open the program or I'll end up turning it off and on again and lose all of this but it was updated as of yesterday but I keep up on all the updates, all the time. It's been going on...about 4 weeks? But it started with occurring maybe once a week, then once a couple days now to the place it is multiple times to constant, during a day. I cannot use Firefox until this is resolved. Thank you for whatever help you can offer. I've run the diagnostic /first aid stuff to no avail through my utilities.