Clear improvement Rated 3 out of 5 stars

This is a good start. There are few annoyances though:

1. it does not search for folder names
2. it does not show where in the hierarchy a name found is (instead it has two windows, so I have first to carefully find the folder by using the right button, then use the arrows, to find the folder)
3. when I remove the search word, the folder is gone, so I still have to try to find the folder manually.

If it could just leave things are they are after the last search, i.e. hiearchy for the bookmark visible with the bookmark found still marked it would be perfect.

An optional option, would be to e.g extend the search syntax, like
f:foldername
l+n:location_or_name
t+k:tags_or_keywords
a-l:all_but_location
where
a:all (default)
n:name
l:location
t:tags
k:keyword
d:description

This review is for a previous version of the add-on (1.9.1-signed.1-signed).