Best Firefox Add Ons

Best Firefox Add-Ons as of 2020: 11 Essentials

What are the most important add-ons for Firefox as of 2020? Whether you are looking for Firefox add-ons for blocking ads, privacy, online shopping, sustainability, tab management or students, you’ll find the best of them in this article.

Best Firefox Add-ons for Causes and Sustainability

Did you know you can help the world and the environment by installing simple Firefox add-ons? The following add-ons tempt to make the world a better place:

TreeClicks Screenshot

1. TreeClicks

While we’re talking about shopping, let’s think about the consequences of our online purchases. Because if anything, buying new products isn’t exactly good for our planet. Have you ever thought about the CO2, the toxins, the waste and the pollution that comes with buying stuff? Don’t worry, we’re not here to tell you to become an activist (although maybe we are?). Just add TreeClicks to your Firefox browser! It has 50.000+ stores (including Amazon) and whenever you purchase something, TreeClicks receives an ad fee and invests it in tree planting projects.

Download TreeClicks as a Firefox Add-on

2. Tab for a Cause

Tab for a Cause makes it super easy to contribute to a good cause. Just add the extension to your browser, open a new tab, and BOOM! – you help them raise money for charity without lifting a finger (well, except your index finger on the mouse).

Add Tab for a Cause to Firefox

Best Firefox Add-ons for Blocking Ads

We all hate pop-ups and ads. Yet, we can’t escape them, because ads are everywhere. We get bombarded with ads on social media, radio, podcasts, TV, the street, and the internet. Luckily there’s an app that you can add onto your Firefox browser that blocks ads as well as pop-ups.

Adblock Plus Firefox Add On
Adblock Plus Firefox Add On

Firefox Add-on 3. AdBlock Plus

AdBlock Plus is one of the most popular Firefox extensions for blocking ads. It’s easy to install and you can benefit from it right away. It allows you to block ads that interrupt your browsing, but you can control what it blocks as well. Sometimes, certain websites stop working if you use an adblocker. You can create your own filter to block certain types of ads and traffic. Here are more features of this beautiful, free add-on:

  • You can allow acceptable ads
  • You can disable tracking
  • You can block malware sites
  • You can block social media buttons

Download AdBlock Plus for Firefox


Adblock Plus is available for Firefox, but also for other browsers like Chrome. Adblock Plus and all the other listed plugins are all available for Firefox. Firefox is a browser, made by Mozilla and has the possibility to install add-ons that add capabilities to the browser.

Best Firefox Add-ons for Online Privacy

Your privacy and online safety is not something you want to mess with. Did you know that whenever you use a public Wi-Fi connection, you risk having your personal data stolen by hackers? You even risk identity theft! The best thing is to use a VPN (a VPN helps you to stay safe online) in combination with these Firefox extensions for privacy.

4. Privacy Possum

Want to keep your internet experience safe and private? Of course you do! Privacy Possum reduces and falsifies the data that is collected by tracking companies, so they can’t access your personal data. There have been some instances in which certain websites don’t work when this add-on is enabled, but you can customise it in the settings.

Download Privacy Possum for Mozilla Firefox

5. uBlock Origin

uBlock Origin lets you see how many ads it has blocked and from what companies the ads came from. You can load and enforce many different filters, such as EasyList, Peter Lowe’s Ad server list, EasyPrivacy, and malware domains. There are even more filters to select, but be aware of website breakage if you select too many. If you want, you can disable ad blocking for individual websites.

Install uBlock Origin for Firefox

Best Firefox Extensions for Shopping

A lot of people do (a big part of) their shopping online. It’s easy, convenient, and you can find loads of deals and coupon codes, which make online shopping often cheaper than “regular” shopping. Here are some add-ons that online shoppers will appreciate.

6. Honey

Enjoy a discount when you shop? Honey makes it super easy for you to shop online and save a buck. It automatically finds and tests coupon codes with only one click. It works with more than 10,000 online shops in the UK, Canada, the US, India, and Australia. Just add it to your browser and start shopping like you’re used to. When you want to check out and pay, click on the Find Savings button the add-on will apply a coupon code if it’s available.

Install Honey for Firefox


Get notified of new deals and offers as you shop. The Firefox add-on notifies you if there are any deals, offers or coupons as soon as you land on the website of a shop. Their database is one of the biggest, with over 14,000 coupons and they update it every day with more than 300 offers.

Install for Firefox

Best Firefox Add-ons for

What is the first thing that pops into your head when you think of online shopping? Amazon? Makes sense, as it has already taken over the world of online shopping. Chances are big that if you do shop online, it is at Amazon. Here’s an extension that will help you out on your Amazon adventures.

8. Amazon Assistant for Firefox

This add-on is Amazon’s official product to help you find your way around the giant online shop. Amazon Assistant finds personalised product recommendations and it shows you the best offers, ratings, and ratings regarding Amazon’s products. You can follow (future) deals and get notified when they go live. It also allows you to save all your favourite items in one place.

Install Amazon Assistant for Mozilla Firefox

Best Firefox Extensions for Tab Management

Tab management, we all need it. How many tabs do you open in one session? About 20? That is a LOT. It induces stress when you work with that many open tabs. Better keep it to a maximum of 5 open tabs per session. If you need some help organising and managing your tabs, here’s the perfect Firefox extension for you.

9. Tab Sidebar

Get a sidebar with thumbnails instead of your regular tab bar! Tab Sidebar is simple, lightweight, and fast. You can even drag and drop tabs between windows. It also makes it super easy to manage your browser history and bookmarks.

Add Tab Sidebar to Mozilla Firefox

Best Firefox Add-ons for Students

Students are tied to the internet – and Firefox – for research and educational purposes. Here are two Firefox add-ons students don’t deserve to live without.

10. Grammarly

English is the official language on the internet. Whether you are a native speaker or not, we can all use a little help to express ourselves more gracefully. Grammarly is an add-on that helps you write correct English. This tool goes beyond the standard spell checker, as it not only checks the grammar but also the context.

The Firefox add-on also works on social media

It works on many popular sites like Gmail, Facebook, Twitter, and LinkedIn. Super handy when you need to write an email to your professor or (future) employer! Grammarly is free to use unless you need more than 400 language corrections per month, which would be $140 a year.

Install Grammarly for Firefox

11. Dictionary

Do you know what “unabashed” means? Ah, well, we sure hope that you are unabashed if you don’t. Add Dictionary to your Firefox browser and you’ll be increasing your vocabulary in no time. This is another free extension, so go ahead and smarten yourself up!

Install Dictionary for Firefox

Best Firefox add-ons summary

So to summarize, in our opinion, the best Firefox add-ons are:

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