I closed Firefox and tried to re-open it, but I keep getting a message that says "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." Help!
My Mac laptop was working very slowly. I closed it but I can't re-open the version I had. I tried to move it to the trash and download a new version but, I keep getting the same message. How can I get rid of this copy and get back to work????
My Mac laptop was working very slowly. I closed it but I can't re-open the version I had. I tried to move it to the trash and download a new version but, I keep getting the same message. How can I get rid of this copy and get back to work????