Rated 5 out of 5 stars

You can modify easily the current version to use with TB 3.1 (works fine) until an official version is released.
Just edit the install.rdf file inside the .xpi file (it´s a zipped archive) with a text editor and change the line 20: 3.0.*
Save and reinstall the nostalgy-0.2.23-tb+sm.xpi extension

This review is for a previous version of the add-on (0.2.23).