mozilla firefox addonsHow to use mozilla firefox addons?

I've installed a mozilla firefox theme, from the site...but it doesn't seem to work....what can i do?
once you download the theme, you`ll have to close the firefox browser and re-open (aka restart browser), once you re-open, follow the steps below:

step 1 - go to &qmozilla firefox addonsuot;tools" -> "Add-ons" from the browser menu, you will be presented with a "add-ons" dialog box,

step 2 - Select the "themes" icon from the top of the dialog box.

step 3 - Select the theme you downloaded, and click the "usemozilla firefox addons theme" button.

step 4 - restart browser.

Voila!
:)
Try another theme and see if the other one works. If not, then try reinstalling your Mozilla. I use Mozilla and my theme is RedShift V2. That works perfectly for me. Try that.