When closing browser I get this message: Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.
For last 2 years I get following message after previously closing Firefox browser and later in same computer session after clicking on Firefox icon to initiate new browser:
Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.
I have updated Firefox every time new version is available and still same issue over last 2 years.
Opaite Mbohovái (3)
Make sure you close the browser using; Windows: Menu > File > Exit Mac: Menu > Firefox > Quit Firefox Linux: Menu > File > Quit
Some users have reported issues when closing the browser using the X upper-right of the window.
https://support.mozilla.org/en-US/kb/firefox-already-running-not-responding
https://www.basezap.com/cant-open-firefox-because-a-copy-of-firefox-is-already-open-mac/
Thanks but I already know this. Want to close browser by clicking "X" at upper right like every other browser.
As my last post says; Some users have reported issues when closing the browser using the X upper-right of the window.
When you start Firefox, it creates several sub-programs. The reason for this is; if one process should lock up or whatever, the user can still have some control.
More than one process is normal for the current Firefox. http://www.ghacks.net/2016/07/22/multi-process-firefox/
Multi-process Firefox is codenamed "e10s". https://wiki.mozilla.org/Firefox/multiprocess