> many pages simply do not work properly with it, plus it has bugs on macos (like onmousover stuff),

I use firefox on mac and I have simply no clue what you're talking about. Tons of people use firefox on mac quite successfully...

The only page that I know of that doesn't work is google earth - it doesn't work on linux either. (Technically it does, just incredibly laggy compared to chrome)

I can't think of a single macos specific bug. Or a single mouse over related bug.