Theres been a change over at the FF add ons page, theyve updated the look of the site and introduced a new add on called "Collections"
Quote:
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"Collections are groups of related add-ons assembled for easy sharing."
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https://addons.mozilla.org/en-US/fir.../editors_picks
So you can make your own pack of add ons or download other peoples
https://addons.mozilla.org/en-US/firefox/addon/11950