Perplexity's Comet Browser
I switched from Chrome to Comet this week, it took less than 10 seconds! ALL my Chrome extensions and bookmarks imported and worked immediately! (I did have to log back in to some of the extensions). I use a Mac and Chrome is a big memory hog on a Mac. I haven't had any memory warnings since I switched. I haven't had time to play with the Browser assistant - its supposed to be able to do agent type tasks - but so far I really love the browser.