giovanni69,
Please post back with the following information.
1. What version of Firefox do you currently have installed. (open firefox, then click on Help, then About Mozilla Firefox). If you have changed from the version you were using when you made the screen shot in your earlier post, please post another screen shot with the current version, then don't change that until the problem is resolved.
2. With all browsers closed, click on Start, Click on Search, in the "All or part of the filename:" box type in Hostperm.1
In the "Look in:" box use the pull down to select "Local Disk (C
Under More advanced options tick the boxes for "Search system Folders", also the box for "Search hidden files and folders" and also the box for "Search subfolders"
Now click on search. Let it run until the search has completed, then copy accurately the full path shown for every Hostperm.1 shown. A typical path would be C:\Documents and Settings\giovanni\Application Data\Mozilla\Firefox\Profiles\ly4nqznc.default
3. Repeat 2 above but using the filename permissions.sqlite
4. Post the above information. Please do not block out or change the user names (where "giovanni is shown in the typical path above). Post the exact path details as otherwise it will be difficult if not impractical to provide you with the next steps
5. Please post exactly how many different log on accounts are being used at present, and whether there have been any other accounts in use.