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#Firefox address bar modifiers:

^ to search your browsing history.
* to search in bookmarks.
+ to search in pages you've tagged.
% to search in your currently open tabs.
# to search in page titles.
$ to search in web addresses (URLs).
? to search for matches in suggestions.

Example: search for word headphones in your bookmarks only type on the address bar:

*headphones

And, if you want to include only the results of your browsing history it would be:

^headphones

https://wiki.tilde.institute/w/firefox-address-bar-tips