Or your User Agent is corrupted, so please use Websites say that Firefox is outdated or incompatible even though it's the latest version
Did you update to Firefox 23.0.1? Please do that before continuing. all other versions are not supported.
Everytime I boot the PC I check for updates , also for plugins and addons. I have the latest version. An new problem occurred....my Youtube account is not accessible. When using Ff portable-no problem. Even in safe-mode this problems persists.
Have a nice day, Defrag
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem.
Thanks a lot for your replies. A reset solved the problems described in the post 04-03-13. A folder "Old Firefox Data" appeared-what to do with this folder? The reset deleted all add-ons, fortunately I saved the troubleshooting info, so I have a list with these addons and more. The problem with the Youtube-account still persists-no idea what the problem is. Co-rel's suggested readings I have still to read....I will do this at home, seems to require some time.
PS: "Most Visited" does not display most visited sites-how to add or remove something there?
Keep the old data for now. It may be of use if you need to transfer or check things from the old profile. There could be a slight privacy / security issue with permanently retaining the old profile on your desktop,especially if multiple users use that account.
Try and check how things are after the reset and report back what issues you still have, before making any further changes, other than creating a new profile.
If you do or did create a new profile note it is good practice
Please post back for further advice if you are considering re naming or deleting any Firefox profile.