Immediately after my last Mozilla update, the system asked me if I wanted Firefox as my search engine. I clicked yes, as I always do when prompted. I don't know if this is the cause or if there's another connection I'm missing, but since then I haven't been able to access other websites. Every time I try, an error message appears saying "Oops, the system has crashed..." or something like that. However, if I use Google or Edge, everything works fine. How can I fix this problem? Can anyone help me? Thank you very much in advance.

my e-mail : [edited email from community support forum]