Thanks! Yes it was Pith Helmet

I've been reading about these add-ons but I've done extensive searches in forum discussions and I cannot seem to find anything on Safari add-ons but surely this topic should have been done to death by now

but I'm really stuck...I've heard that Saft also does adblocking, so is Saft a better all-in-one?
What are the differences in features between Saft and Safari Stand? What differences are the Pith Helmet to Safari Block? Any help would be great!
I would like the following features for Safari:
- Search shortcuts in the URL address bar eg. typing "g mactalk" will generate a google search results of "mactalk"
- Ability to move between tabs via a keyboard press
- Keyboard shortcuts
- Ability to save sessions so when I turn my Mac on again my browser restores that pages I was viewing prior
- History and Bookmark search
- Ability to add other "searches" eg. If I wanted to add Wikipedia search and again I go back to the first point where I can put "w safari" to do a wikipedia search on Safari
- Adblocking
Could you please recommend add-ons for the above features?