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.

While Adblock Plus led the charge at the beginning of the year, uBlock Origin was able to close the gap and if current usage trends among Firefox users continue, it may take the top spot in early 2022 according to a new blog post from Mozilla.

One of the reasons users choose Firefox as their preferred browser is to further protect their privacy online. While adblockers can stop ads from following you around the web, other popular extensions this year that protect against invasive tracking include Mozilla's own Facebook Container with 1.7m daily active users and Ghostery with 1.1m daily active users.

In addition to putting out a list of the most popular extensions each year, the Firefox Recommended Extensions program is a curated list of third party extensions that meet Mozilla's highest standards of security, utility and user experience.

For those who often find themselves drowning in a sea of open browser tabs, Tab Stash may be the perfect extension as it adds a toolbar button that when clicked, saves all of your open tabs as temporary bookmarks. If you're using Firefox Sync, the service will automatically show your Tab Stash bookmarks synced to other devices.

Another interesting extension highlighted by Mozilla is Stylebot. This extension gives you the power to dramatically alter the way any website looks from font sizes to color schemes to content layout. Perhaps you're intrigued by vertical tabs in Microsoft Edge? Then the Sideberry extension can be used to organize your open tabs in a cascading “tree” tucked away to the side of your browser.

While web browsers have certainly come a long way, extensions allow you to further customize their look and fell as well as their functionality which can help you be more productive or just have a better browsing experience overall.

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