I didn't use many add-ons, but I miss the home page thing which had my most used sites. (I don't see the point of the tab collections. I don't want to nor have time to do many things at once when I'm using my phone – I want to do one thing now.)

It also starts up a lot slower than the old one, and there's a bug where sometimes a page will just stay white and I have to flick back and forth between tabs or restart it to get it to load.

But I do notice there's less delay when clicking on a link from a page, so that's nice I guess.