Add
%to search for matches in your currently open tabs.
Saved my day…
| Address bar autocomplete in Firefox - Search your bookmarks, history and tabs | Firefox Help https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox#w_changing-results-on-the-fly
Please be advised that this post was written or last updated a while ago and may therefore contain outdated information or opinions I no longer hold.
请知悉本文自写作或上次更新已届相当时限，或包含过时信息及观点。