After updating "Refresh Firefox" I am no longer able to search in firefox search bar or go to youtube or google. I get your connection is not secure

I updated firefox with "Refresh Firefox" command inTroubleshooting information page. Now I can't access Youtube, Google and can't use the search function in the browser window. I get Your connection is not secure error page with no option to bypass. The reason I updated firefox was because it was very very slow... it would take 5-10 minutes after opening before I could go to any web site. Now its fast but can't use web sites I use everyday.