Its another dishonest LYING Clickbait Add-On; something which is currently rife here at Firefox these days (and something which Mozilla FF should put a stop to).
They can twist and shape their BS description introduction as much as they want but - and its a 'Big BUT' - it is NOT free! Therefore they are lying to all of us, like all the software companies', do just to get your money.
Software (and the developers pushing it) that comes with a final money cost/price should not be allowed to use the FF Add-Ons area to sell their products! They are also blatantly using FF as a free advertisment area; for much of their inferior developments I must add...or should I say Add On, :) lol.

If a person/developer/company can't, or won't, tell people/clents the truth at the start then, they sure as hell are not getting my interest and definitely NOT my money.

PS: They will be giving Firefox a new name in the future if this BS is not stopped A.S.A.P. It will become 'MOZoogle' or, perhaps more commonly, FireFoogle!