Diễn đàn hỗ trợ Firefox

Why isn't there a simple means to remove/prevent searches for the address bar, using config doesn't work.

I've used Firefox for over twenty years, this annoyance will end that and force a move to Brave.

Somehow yahoo became my default search engine and when I do a search I get the same advertisement that blocks the entire landing screen, how can I change it back to google?