Firefox has a very good search bookmarks feature.  Issue the command control I to toggle it on and off.  Type part of what you are looking for.  It doesn’t have to be the start of it.  For example, I search for The New York Times with rk ti.  Look at what I wrote caracgter by character.  The period ends the sentence and is not part of the search string.  Note the space in the string.

 

You can open bookmarks with alt b.

 

Gene