OK + Feature suggest. Rated 5 out of 5 stars

Fully working in my XP with FF 21.0.
Suggestions:
A• An option to change the background list.
B• An option to change the font color.
C• An option to change and/or disable the font shadow. (Realy i have to force my eyes to read)
D• A second animation targeting design (to let the user chose one or other) a little bit more smoothly. (I happened an animation's half size, circles with more thickness, changeable color, changeable animation time, and an option to play it twice)
E• I tried "Findbar Favorites" (here in AMO), and your add-on align to the most right of the findbar the words that Findbar Favorites add-on add to the findbar. Could you make it "compatible"? Is very interesting and usefull that add-on too.

Nothing more. Forgive my bad english, and keep doing good stuff. Thanks for the space.

This review is for a previous version of the add-on (3.4.1-signed.1-signed).