Yes some of the Add ons don't work on all 64 bit operating systems. I'm sure they'll get there in the end.

If you are using Firefox I guess you mean that when you type something in the URL bar / location bar the browser prompts you with where you've been and what you've saved as favourites...

Go to Edit => Preferences => Choose Privacy => At the bottom you'll find the location bar settings. Here you can choose what you want.

Does that help?