There's no RSS news aggregator

you can't create "groups" of links separate from your bookmark folders

This efficiency leads to Firefox's only real problem: It simply doesn't do enough. There's no RSS news aggregator, you can't drag tabs around to reorder them, you can't create "groups" of links separate from your bookmark folders, and so on. Firefox is a basic web browser, a framework that's "good enough for many of us" and meant to be extended through a rich plug-in architecture.