Black Cat ^^ is a user on mastodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
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In Firefox's addressbar, you can limit results by typing special characters before or after your term
^ for matches in your browsing history.
* for matches in your bookmarks.
% for matches in your currently open tabs.
# for matches in page titles.
@ for matches in web addresses.
@dpreacher thanks for pointing out this cool feature, didn't know that before !
@numimyon Thank Asa Dotzler. I couldn't let a worthy tweet go waste among those Chrome loving Facebook users pretending to be cool by tweeting. Had to bring it here.