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12 best Firefox security and privacy add-ons in 2021 (free)

Your Firefox web browser is now the most used app on your computer and on your mobiles devices. Almost all apps are now running on them: webmail, office (Word, Excel…), media library (Plex), and plenty of other online apps. Not surprisingly, they are also one of the main vector for malwares, and need to be properly secured.

Firefox add-ons

You can find Firefox add-ons here:

Secure browsing

Those are basics, but they will allow to strengthen your browsing sessions.

HTTPS everywhere

HTTPS everywhere encrypts the web by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https prefix.

Be aware it does not protect you on ‘HTTP only’ site though, so never provide any passwords or credit card numbers on those sites !


Although this add-on may be a bit irritating sometimes, this is definitely the best security you can get in a web browser!

It allows potentially malicious web content to run only from sites you trust. It protects yourself against XSS and other web security exploits.

Ad blockers

Not being bombarded by advertising will improve your browser speed and page load speed by decreasing bandwidth. But did you know ads may also contain tracker or malware ? So blocking them is important. Pick only one add-on among the list below.

uBlock Origin

uBlock is free, open source and easy with CPU and memory efficiency.

It has wide-spectrum content blocker, which include Youtube ads, malware domains…

AdBlocker Ultimate

AdBlocker is free and open source.  It blocks 100% of ads and is guaranteed without any whitelist (i.e. certain advertisers pay to bypass ad filters).

It filters against annoying display and video ads, including YouTube.

AdGuard AdBlocker

AdGuard is free and open source. It blocks ads on facebook, Youtube and all other websites.


Anti-trackers block invisible trackers as their name may suggest, and come in addition of ad blocker. Pick only one add-on among the list below.


Ghostery’s built-in ad blocker removes advertisements from a web page.

But this add-on also has enhanced anti-tracking functions and anonymises your data to further protect your privacy.

Privacy Badger

Privacy Badger automatically learns to block invisible trackers. Instead of keeping lists of what to block, Privacy Badger automatically discovers trackers based on their behaviour.


Decentraleyes protects you against tracking through “free”, centralised, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking.

Cookies cleaner

Cookies also contribute to tracking… and are a real nuisance. That’s why regularly deleting them contribute to blurring the lines.

Cookie AutoDelete

Cookie AutoDelete is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Whitelist the ones you trust while deleting the rest. Support for Container Tabs.

VPN Proxy

Changing IP (in addition of encrypting the data) is also a great way to blurring the lines. It can be used in addition of a standard VPN installed on your router or on your computer / mobile device.

Hotspot Shield free

Hotspot Shield free will allow you to surf the web without restrictions and access all your favorite news, social media, and streaming sites with Hotspot Shield Free VPN Proxy.

Password managers

Having different password for each website is mandatory. Password managers help you to generate them, to remember them, and automatically fill them in! We love Bitwarden, but there are plenty other free or paying password managers. Pick only one add-on among the list below.

Bitwarden Free Password Manager

Bitwarden is a secure, open source and free password manager for all of your devices

LastPass Password Manager

LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

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