Using a bookmarks toolbar not only saves you time accessing frequently-used sites, it also makes the line of death a lot clearer and makes it harder to fake notifications/permissions popups.
It bugs me further that browsers don't let me decide whether the top bars get shown. Sometimes it'd be really nice to toggle off all the browser chrome and just have a true full-window view of a page (Full-window, not full-screen: in particular if I'm opening multiple pages and tiling them vertically, all that browser chrome starts taking up a lot of space really quickly).
Dear browsers: this is hopelessly backwards! Websites should never be allowed control my browserchrome. I should always be in control my browserchrome. Given that this is already configurable per-window, put that switch solidly in my hands!
I thought everyone just googled and looked for links they'd previously visited...