Dear FF volunteers, Thank you for your service!!! FF showed note that start process is slow and I should reset settings. I did so. And also deleted the profile and created a new profile just to be safe and start from a very clean slate. The new profile worked for a few hours fine, but when I start Firefox now, it opens with a new profile, i.e. all bookmarks and extensions are gone, except for the Lastpass and Avast plugin. Why? I had installed these extensions: Lasspass, Avast antivirus, easy copy, Adblock plus, Bbuffer, Fireshot. Is one of them corrupting the Firefox profile? When I press the "Automatically add" button for Troubleshooting information here in this form, I get the error message that it can't connect to the mozilla server. I had the same problem when installing the lastpass extension. Which I then did my manually installing it. I appreciate your help! Joerg