To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for ANIMATED - Snoopy Nap by sean50350
Rated 5 out of 5 stars
Everyone that got problem should read this: https://support.mozilla.org/en-US/questions/965834?esab=a&as=aaq
It fixs the problem I met.
To create your own collections, you must have a Mozilla Add-ons account.