I've used Mozilla browsers from the days of K-Meleon, switched to Phoenix, which was renamed Firebird and finally renamed Firefox. Having used it for so many years, I have it highly customized. The incorporation of the "Bookmarks Toolbar" into the Nav bar is particularly important to me for getting to references and sites easily and the biggest problem with the new design of FF. Certainly, I could probably find an add-on that would solve the problem but I don't need to since Pale Moon works as expected.
To not be completely negative about the FF update, I do like the appearance of the curved tabs. However, merely working with Firefox 29 for short periods of time today, it would hang and then resume.
I did a comparison between Pale Moon and Firefox 29 and annotated the differences that stood out the most for my usage. To see the full size, click the image below.