Excellent options! Rated 5 out of 5 stars
I run this in conjunction with the very similar Configuration Mania. PM currently is the best browser but I run every major browser for testing and comparison purposes. This add-on gives a number of options specific for PM. CM also gives great options and it works for both FF and PM- but this one is important for PM users.
PM users probably are likely to really want to fine tune their browsers and the developer MC does a really good job of maintaining user choice.
One of the greatest problems with rabid-release is it ultimately is destroying user choice- a pillar that Mozilla used to cherish. MC should be saluted for maintaining that value that so many hold near and dear.
If you like customization run Palemoon and then you can be in choice heaven!