The event occurred again with the 3.0.9 update. I suspect that during the update something happens and prevents the old instance to close properly. Indeed also the "Clear Private Data" dialog does not appear. Note that I took the time to download, install and test the update on the original firefox binary provided by mozilla.com
It works flawlessy, the problem is probably due to the change in the update strategy made by ubuntu.
The event occurred again with the 3.0.9 update. I suspect that during the update something happens and prevents the old instance to close properly. Indeed also the "Clear Private Data" dialog does not appear. Note that I took the time to download, install and test the update on the original firefox binary provided by mozilla.com
It works flawlessy, the problem is probably due to the change in the update strategy made by ubuntu.