Last night after using Firefox for years I started experiencing extremely slow response time on most sites. Kept getting a message "A web page is slowing down your browser. What would you like to do?" The sites work fine on Internet Explorer. So I know it is an issue with Firefox. I tried so many things and has been very frustrating. After uninstalling and reinstalling several times and trying various things I believe I was able to troubleshoot possible cause but don't know why it is happening. If I reinstall and bring up Firefox the pages work fine. For many years I have been using Profile Manager option of Firefox to run multiple sessions. Now after setting up a profile, if I open the profile session this is when the slowness occurs. This has never happened in the past, never!! I could run 1 session or multiple and never had an issue. Now if I run one or more sessions I get the slowness and no response from many sites, which are working fine on other browsers. PLEASE HELP!!!!