They sort-of-do, but on my machine (an i3 with 8GB memory running Ubuntu), there's threshold that - when crossed - causes it to slow down considerably, and e.g.

They sort-of-do, but on my machine (an i3 with 8GB memory running Ubuntu), there's threshold that - when crossed - causes it to slow down considerably, and e.g. take about 5 minutes to become interactive after quitting and restarting. Also, they are way too easy to close accidentally; bookmarks stay, but if you accidentally closed one of your thousand tabs 3 months ago, good luck finding it in history.