Best Mozilla Firefox Browser Add-ons for Security in 2021

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Over the past few decades, the Internet has grown to become an irreplaceable part of our lives. And while many of us love the worldwide network, we do fail to forget the dangers it might bring into our lives, such as hackers.

Even though hackers mostly tend to target businesses in their search for profit, we cannot say that any other “insignificant” user is safe from their attacks. Moreover, a 2019 research has shone a light on the fact that there are around 300 000 new pieces of malware created on a daily basis.

This allows us to conclude that a separate cyber attack takes place every 39 seconds. These statistics help you understand that you can never be too careful on the Internet. Naturally, the first step to take would be to use a secure and reliable Internet browser, such as Mozilla Firefox.

Mozilla Firefox is known to be one of the most secure Internet browsers out there. Nevertheless, its default version does not guarantee absolute immunity. To ensure maximum security you should use Firefox add-ons that provide extra safety on all fronts and improve your browsing experience.

It should be mentioned, of course, that most of the available add-ons are developed by third-party companies that are not always able to deliver the best results. For your safety and convenience, we have picked the best security add-ons for Mozilla Firefox to ease your way into the world of secure browsing.

5 Best Firefox Add-ons for 2021

#1 VPN Service

As most Internet browsers, Mozilla Firefox does not protect you from ISPs collecting and selling your data to third-party companies. This nuance leads to hackers being able to easily attack you as all your Internet activity can be accessed by using your IP address.

The best way to protect yourself from this sort of a risk is using a Firefox VPN extension. Even though you might be safe from potential cyberattacks, you cannot trust your data to any ISP. When it comes to data security, Virtual Private Network (VPN) is the best add-on Firefox can offer. So it’s must have a VPN Extension for Firefox to stay private when you browse.

The title is pretty self-explanatory: the service provides the user with an encrypted private network that allows them to browse the Internet safely. VPN uses secure channels to hide your IP address to ensure that no third party can intercept your data in any way or form. Moreover, the add-ons also come with an ad-blocker and a malware shield that helps you avoid any potential attacks.

#2 HTTPS Everywhere 

Although the safety protocol (HTTPS) has been developed and implemented by many websites a long time ago, most websites still do have limited support for its functionality.

What is more important is the fact that all websites, including the ones with HTTPS, have ads and links for other websites placed all over. This raises the probability of opening an unencrypted page to a dangerous point. The solution to this problem is an HTTPS exclusive Firefox add-on, such as HTTPS Everywhere.

HTTPS Everywhere is an extension developed by Electronic Frontier Foundation that encrypts every single web page you open in your browser, no matter HTTP or HTTPS. Other than that, it also encrypts your searches and takes care of all such nuances.

The way it works is pretty simple as well: the program rewrites the URLs and adds exception filters to encrypt all data and open websites securely. In case a website seems suspicious or cannot be encrypted, the add-on lets you know by showing a lock icon, which allows you to back off from a potentially harmful website.

#3 uBlock

If there is something everyone can agree on is that ads are annoying. Moreover, they often can be called borderline illegal, if we take a look at the way they collect data and then use it to target us with more and more ads. And as if it couldn’t get any worse, ads are also known to be a tool cybercriminals often use to their own advantage as they are able to hide all sorts of crypto-miners and other malware.

So, it is a good thing someone came up with the uBlock Firefox add-on. uBlock blocks any and all ads that might pop up, making your browsing experience more secure and pleasant at once. If you are not using it yet, you definitely should try it out right now. Welcome yourself to the brand new world of ad-free Internet.

(Side note: other ad blockers, such as Adblock Plus, are now known to sell user data to third-party companies. uBlock is the safe way to go.)

#4 Bloody Vikings!

Although spam emails are not necessarily always a targeted hacker attack, they can still be pretty hard to deal with. You delete one email, but this doesn’t break the never ending cycle of junk coming to your mailbox due to the fact that you constantly give away your email address on every other website.

A great way to solve this problem is to use a disposable email address instead of your main one. Bloody Vikings! is a Firefox browser extension that pretty much follows the same principle.

Bloody Vikings! is a simple and convenient browser add-on that generates disposable email addresses for its users. It uses a variety of different email services that provide addresses that have an expiration date on them. All it takes to activate it is to click on it and choose the email service you want to use and voilà, your fake address is ready to use.

#5 Decentraleyes

Vast amounts of data being exchanged makes about half of everything that happens on the Internet. The mechanism that simplifies the whole process is the central delivery networks (or CDN) that deliver web pages to the users according to their geographical location.

The CDNs are mostly giant companies, such as Google and Microsoft. Therefore, it is safe to say that while they provide you with access to whatever it is you do on the Internet, they also keep their eye on your Internet activity and use the information for the development of new business strategies. If you are looking to avoid being exploited like this, you will need to install a CDN barrier extension, such as Decentraleyes.

Decentraleyes is an innovative open-source Firefox add-on that allows its users to use local CDN resources. Basically, it stops primary CDNs from accessing (and eventually selling) your data on the Internet. If your browser tries to connect to a CDN, the add-on automatically blocks the request and forwards it to a local network. Thanks to Decentraleyes, you can say goodbye to data tracking.


The Internet is a wonderful and irreplaceable part of our lives that lets us connect with each other as well as get our hands on any information we might need. Nevertheless, we are still vulnerable to the dangers of cyber-attacks and spam emails along with countless others.

The best way to secure yourself is to get a reliable browser, such as Mozilla Firefox, and top it off with all the add-ons that make your Internet experience safe. We have compiled the list above to make this whole process easier for you. Make sure to check them out and be safe.

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