I have downloaded and Installed several firefox add-ons and plugins. I like to be able to backup these add-ons, so that a new fresh installation does not require new Downloads.

So my question is --

How can I backup my current installed firefox add-ons, to avoid redownloading?

Edit

One answer Added a method to backup. How can i restore those add-ons without installing every add-ons I had installed ?. (Like copying add-on files on specific directories.)