EVERYTIME I HIT COMMAND, OPTION OR CONTROL MY COMPUTER DOES WEIRD THINGS WITH A CLICK SSSSSHH SOUND
about three days ago , out of the blue, my computer started making weird loud echoey sound every time I hit the COMMAND, OPTION, AND CONTROL KEY AND THE LEFT HAND SHIFT KEY> < GOING TO CAPS< NOT RESPONDING< DOING THIS STUPID ARROW THING< GOING INTO SYMBOLS< ETC ETC>
HELP
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Is this only with Firefox or the computer.
Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
Start your Computer in safe mode. Then start Firefox. Try Safe websites. Is the problem still there?
http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia
You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.