i really wanted to use Firefox, so I switched recently. It lasted about 3 hours. Every time I tried to Google something I got a warning that Google was a danger

i really wanted to use Firefox, so I switched recently. It lasted about 3 hours. Every time I tried to Google something I got a warning that Google was a dangerous site because of their self-signed certificate (seriously? Google should be on the list of trusted certificate signers, no matter what you think of their business model). Then it asked if I wanted to trust them. I answered yes, repeatedly, yet the error message reappeared over and over again. (really bad). I gave up. A little more competence and I'm on board.