Rated 3 out of 5 stars
3 Stars for 1.5.1.
I hope the setting in about:config is just a fast workaround (thx for that!).
It would be much better with a small interface for setting these options.
Thanks for the fast update!
Please feel free to try 1.6.0, still experimental, available at https://addons.mozilla.org/en-US/firefox/addons/versions/6715.