fannish search bar add-ons?

I'm slowly digging around through this new computer, restoring things to my preferred configurations - and I had this great thing going on my old laptop that added both Fanlore and the AO3 to the drop-down list of possible search engines in the search bar on Firefox, but I can't figure out now how I made it do that. Any ideas?

(Also, this machine seemingly did not come with Garamond? idek. I had to go find the .ttf file in the Boy's PC and email it to myself - I cannot live without Garamond, fr srs.)