If you're security-conscious then you'll install updates immediately, before you get compromised by whatever attack it might be fixing.
In reality no-one outside Mozilla is auditing updates (other than black-hats reverse-engineering security fixes to catch the people who don't update immediately). I don't think the situation for other browser vendors is any different.
In reality no-one outside Mozilla is auditing updates (other than black-hats reverse-engineering security fixes to catch the people who don't update immediately). I don't think the situation for other browser vendors is any different.