Trying to open Firefox today I get the message: A copy of Firefox is already open. Only one copy of Firefox can be open at a time. 'm stuck!
I can't access Firefox. Get message: A copy of Firefox is already open. Only one copy of Firefox can be open at a time.
Firefox is not open and I need it!
Solution choisie
Macs: Make sure you install Firefox properly and that you do not run Firefox from within the DMG (Disk Images) file. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac
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What's your computer system and Firefox version?
https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
https://www.basezap.com/cant-open-firefox-because-a-copy-of-firefox-is-already-open-mac/
iMac OS 11.3.1 Can't identify FF version as can't open it! Can't find FF in library or app support so can't find profile Really stuck.
Solution choisie
Macs: Make sure you install Firefox properly and that you do not run Firefox from within the DMG (Disk Images) file. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac
Thank you so much! I didn't quite understand everything but by some magic it worked!! And Firefox is back with me and all seems to be in order.
Glad to help. Safe Surfing.