AniList's unofficial search от Youssef H.

This add-on adds AniList search to Firefox's omnibox.
To search for an anime, type "al" followed by the a keyword:
al clannad after story

To search for a manga, staff, studio, or a character, type "al" follow by the type, and finally a keyword:

al anime [anime title]
al manga [manga title]
al staff [staff name]
al studio [studio name]
al character [character name]