Not to let Firefox off the hook, but the link in that bug loads a tag list, which the page writer geniusly decided to non-breaking space the entire thing. It's essentially treating almost 1 Mbyte of text as a single word 90,000 letters long (850,000 including font sizing tags). I replaced one of the non-breaking spaces with a normal space and the page loads instantly and type ahead search works perfect.
You can't necessarily blame Firefox every time a web designer makes a bad choice.
Promising costs nothing, it's the delivering that kills you.