Φόρουμ υποστήριξης - Firefox

As with others I can't find my old profile. I renamed it long ago as my primary profile and have updated firefox many times since. On Sat 8/14 I updated Sahara and my profile won't reload, instead I'm getting a window claiming the profile is too old. I've been through and through the FAQs and am not enough of a successful user to get to the right folder to find a usable profile with my data still in tact. about:profiles, where I usually go now had 43 profiles in it including my previously renamed profile but that doesn't help. I refreshed ff without success. I tried to find help in the many profiles help pages that said click on this, copy this, click on the profile tab, go up one level and turn left and you lost me. Can anybody help me find my usable profile and simply explain how do I re-initiate it? Thanks.

When I am using the firefox browser and I click on a link to take me to duckduckgo.com or I enter duckduckgo.com in the url line and hit enter, instead of taking me to the duckduckgo website I get a white page with the message: Application error: a client-side exception has occurred (see the browser console for more information).