I re-installed firefox as it seemed to have irregular problems. After download software and installing I imported saved bookmarks. Since then every time I have tried to click on links in emails or documents on my desktop (Windows 7) I get the message "this operation has been canceled due to restrictions in effect on this computer. I have followed all the suggested solutions eg clearing cache, editing registry but nothing works. Firefox is my default browser. Could something have gone wrong with new installation. Should I do it again. Or is it something else. I have been using Firefox as my default browser for more years than I can remember and dont want to change now.