3.01 has been pretty good to me, that is once I turned off the bookmark search part of the NOT-awesome URL bar.
While it was still searching 500+ bookmarks every time I’d type a character in the URL bar my older laptop was unusable.
You can turn it off with an about: parameter or with the add-on called “Hide Unvisited 3”.
Okay, uninstalled & reinstalled twice (even wiped all saved data).. still freezing. F-ing strange, this...