Updates cannot be installed because other copies of Firefox are running - when I know there aren't any running.
When I start Firefox I get the message 'The update could not be installed. Please make sure there are no other copies of Firefox running on your computer'. 1. I cannot find any other copies on my computer. 2. I have run the 'Refresh' programme without any improvement. 3. I have uninstalled ans reinstalled Firefox but continue to get the message.
Solución elegida
Some protection programs don't like the update/install stubs http://www.mozilla.org/en-US/firefox/all/ Download Firefox For All languages And Systems
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Reboot the computer. Then try the install.
How to crash Firefox (All Systems); Instructions here; https://developer.mozilla.org/en-US/docs/Mozilla/How_to_report_a_hung_Firefox
This link has a program that can crash Firefox.
I have done as you suggested but I still get the message about being unable to instal updates when I restart the programme.
Solución elegida
Some protection programs don't like the update/install stubs http://www.mozilla.org/en-US/firefox/all/ Download Firefox For All languages And Systems
FredMcD, Thank you for your advice. It has solved the problem. Many thanks again for your help.
Glad to help. Safe Surfing.