It made the back button useless for me.

If you curate your browser history, this is an easy fix. This is more of a problem for people like me who occasionally check their browser history because they want to revisit a site they were on recently.

Not tackling the same problem but in the spirit of removing things and Firefox, you can bring up a url in the address bar, press down arrow, press Delete, and it'll go away

It only deletes that very specific url though, like foo.com, however foo.com/bar will still exist

I think that only works before Sync replicates all those crufts to every other device.

Wow, that took multiple minutes to run here.

Well done to the author of this hack on finding a way to dump massive amounts of data to firefox's sqlite store.

It actually just updates window.location.hash instead, which does cause a flood of history entries (looks like just one per distinct animation state, though, at least in Chrome). See the "One Last Thing" section near the bottom of the article for the rationale. See the inline code snippets in the article, or view source for wavyurl.com to see the actual code used.