A version which will not break bookmarking Rated 5 out of 5 stars

Yes, this extension on AMO currently breaks a number of basic bookmarking features.

But Frank Lion has a couple of versions of the same extension and they do not break bookmarking.

He has them named Compact Menu3 (two display versions)
http://franklion.co.uk/extension.html

This user has other reviews of this add-on.