Rated 5 out of 5 stars

This is one of my favorite extentions. It is usually one of the very first ones I install.
My favorites in order:
1. XMarks (paid version)
2. Lastpass (paid version)
3. LittleFox
4. FasterFox
5. AdBlock+

This review is for a previous version of the add-on (2.0.13).