The most popular Firefox extensions of 2021 were both adblockers

Customizing Mozilla’s browser with add-ons can give you a whole new experience when browsing the web though only one-third of Firefox users have installed an extension or theme.

Among the 100m + users that did install an extension this year, adblockers were the most popular with Adblock Plus taking the top spot followed by uBlock Origin. Across the span of 2021, Adblock Plus had an average of over 6.1m daily users while uBlock Origin averaged just over 5m + daily users over the course of the year.

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