The dashboard of Firefox looks different and I have tried everything suggested.

Hello, My Firefox dashboard looks very different. I like a darkview mode and it won't connect to dark view mode. Also, for each website I visit........it looks different and connection is questioning my access each time. I've compare this to my laptop and the same website looks different. Please help. In fact, right now, this page won't allow me to select the option to email me when someone answers the thread. My email address is [redacted email from public community support forum] Thank you in advance. Margaret