The top line in the window (nomen endereco), right-click on it and select/deselect what you want.

This hides the bottom two rows but some space is not recovered (there's some extra blank space that isn't removed).

#editBookmarkPanelRows #editBMPanel_tagsRow,
#editBookmarkPanelRows #editBMPanel_tagsSelectorRow,
#editBookmarkPanelRows #editBMPanel_keywordRow {
  display: none !important;
}

To find other selectors, you can paste the following to the address bar and press Enter to load the source for the skeleton of the Library window:

view-source:chrome://browser/content/places/places.xhtml

But that won't give you the applicable CSS unfortunately, so it will take more work to chase down the source of the extra space.

P.S. Why Yandex Browser?

The extra space seems to be that there is a height set to the #detailsPane container.

Add code to the userChrome.css file below the default @namespace line.

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

#editBookmarkPanelRows #editBMPanel_tagsRow,
#editBookmarkPanelRows #editBMPanel_tagsSelectorRow,
#editBookmarkPanelRows #editBMPanel_keywordRow {
  display: none !important;
}

#detailsPane {height:unset !important;}