15 Privacy Settings Every Firefox User Should Enable Today (2026 Guide)

In the modern digital era, where aggressive web scrapers, multi-billion dollar data brokers, and massive advertising giants ruthlessly track your absolutely every single click, scroll, and keystroke, your choice of web browser is your absolute first, most critical line of defense.

While tech giants like Google Chrome and Microsoft Edge continue to massively dominate the global browser market share, it is critical to remember that they are explicitly built, funded, and maintained by massive advertising corporations. Their foundational architecture fundamentally prioritizes aggressive data harvesting and highly targeted monetization over your personal privacy.

That is exactly why Mozilla Firefox remains one of the absolute best open-source alternatives for power users seeking true, uncompromising online privacy in 2026. Because Firefox is strictly maintained by the non-profit Mozilla Foundation, its core business model does not inherently rely on monetizing your personal data or tracking your search history.

However, Firefox’s out-of-the-box, default settings are deliberately configured to strike a delicate balance between website compatibility, user convenience, and basic security. They are not configured for maximum privacy.

To completely transform Firefox from a standard web browser into a hardened, highly secure, tracking-resistant digital vault, you must take control and meticulously configure a specific set of advanced settings manually.

Here is our exhaustive, massive step-by-step guide to the 15 critical Firefox privacy settings you absolutely must enable today.

1. Enable Enhanced Tracking Protection (Strict Mode)

Firefox includes an incredibly powerful, built-in feature called Enhanced Tracking Protection (ETP) that automatically blocks known, malicious trackers from loading on the webpages you visit. By default, upon a fresh installation, this is set to “Standard”. Standard mode deliberately allows certain types of tracking to occur in order to completely prevent older, poorly coded websites from visually breaking.

To maximize your privacy and aggressively block surveillance capitalism, you absolutely must change this setting to “Strict”. Strict mode ruthlessly blocks social media trackers (like Facebook “Like” buttons spying on you across the web), highly invasive cross-site tracking cookies, device fingerprinters, hidden cryptominers, and all known tracking content in every single window you open.

How to Enable:

1. Click the Menu button (the three horizontal lines, often called the “hamburger menu”) located in the absolute top-right corner of the browser and select Settings.
2. Navigate to the Privacy & Security panel in the left-hand sidebar.
3. Under the highly visible Enhanced Tracking Protection section, firmly select the radio button for Strict.
4. Click the large blue Reload all tabs button that instantly appears to immediately apply the aggressive new rules.

[!NOTE] If a specific, older website’s visual layout completely breaks under Strict mode (e.g., a video fails to load, or a login button disappears), do not panic and revert the global setting. You can easily and temporarily disable Strict mode for that specific individual site by clicking the small Shield icon located to the immediate left of the URL bar and simply toggling the switch off.

2. Aggressively Block Third-Party Cookies

Third-party cookies are small, highly invasive tracking files deliberately placed on your hard drive by advertising domains other than the specific website you are currently visiting. They are the primary weapon used by global advertisers to silently track your browsing habits across dozens of completely different, unrelated websites in order to build a massive, highly accurate psychological profile of your interests, fears, and shopping habits.

While Firefox’s Strict ETP mode (enabled in Step 1) handles the vast majority of this automatically based on a known blocklist, you can forcefully customize this behavior at a deeper level to ensure absolute, 100% block coverage against unknown or newly created trackers.

How to Enable:

1. Navigate back to Settings > Privacy & Security, and scroll down to the Enhanced Tracking Protection section.
2. Select the Custom radio button.
3. Ensure the Cookies checkbox is explicitly checked.
4. From the associated dropdown menu, meticulously select All third-party cookies (may cause websites to break).

3. Block Known Trackers in All Windows

Trackers are invisible JavaScript files aggressively embedded deep within the HTML of websites that silently collect massive amounts of telemetry data about your device’s hardware configuration, your physical IP location, your screen resolution, and your highly specific browsing habits.

By default, Firefox’s custom mode only aggressively blocks this tracking content when you are using “Private Windows.” You absolutely want this intense protection running 24/7/365, regardless of what type of window you are using.

How to Enable:

1. In the highly customizable Enhanced Tracking Protection section of Privacy & Security, ensure the Custom radio button is still selected.
2. Ensure the Tracking content checkbox is explicitly checked.
3. Change the specific dropdown option from its default In all private windows to the highly aggressive In all windows.

4. Enforce HTTPS-Only Mode Globally

When you browse the internet using standard HTTP connections, your web browser transmits all of its data completely in plaintext. This massively exposes you to local network snooping, ISP data harvesting, or highly malicious “man-in-the-middle” attacks at public coffee shops.

HTTPS securely, mathematically encrypts this connection between your browser and the server. Enabling HTTPS-Only Mode aggressively forces Firefox to attempt to automatically upgrade all web connections to secure HTTPS. If an older, insecure website physically does not support HTTPS encryption, Firefox will throw up a massive, full-screen red warning page demanding your explicit consent before letting you connect to the dangerous, plaintext site.

This perfectly matches the same strict cryptographic encryption principles we heavily discuss in our massive masterclass guide to Encryption Tools and Full-Disk Security.

How to Enable:

1. In Settings > Privacy & Security, scroll all the way down to the absolute bottom of the entire settings page.
2. Locate the highly important HTTPS-Only Mode section.
3. Select the radio button labeled Enable HTTPS-Only Mode in all windows.

5. Enable DNS over HTTPS (DoH) to Hide Your Traffic

Whenever you type a human-readable web address (like freetechlearner.com), your browser must explicitly ask a Domain Name System (DNS) server to mathematically translate that name into a machine-readable IP address. By default, on almost every operating system, this highly sensitive DNS request is sent completely unencrypted in plaintext. This means your local Internet Service Provider (Comcast, AT&T), and absolutely anyone snooping on your local Wi-Fi network, can see a perfect, clear-text log of absolutely every single website you visit.

DNS over HTTPS (DoH) completely encrypts these highly sensitive requests. To deeply understand how DNS routing works under the hood, read our massive architectural guide on What is DNS and How the Internet Phonebook Works.

How to Enable:

1. In Settings > Privacy & Security, scroll down to the DNS over HTTPS section.
2. Under the Configure protection level header, select Max Protection. This highly aggressive setting routes absolutely all DNS queries entirely through the encrypted DoH tunnel and violently refuses to fall back to the insecure system DNS unless you explicitly allow it.
3. Choose your highly preferred, secure resolver from the dropdown menu. Cloudflare is the default and is incredibly fast and highly secure.

6. Automatically Clear All History on Exit

To completely prevent highly invasive local snooping (for example, a roommate, a coworker, or a hostile actor opening your physical laptop while you are in the bathroom and viewing your highly sensitive search history), you must aggressively configure Firefox to instantly, automatically wipe your browsing history, your image cache, your active session logins, and all tracking cookies every single time the browser is closed.

How to Enable:

1. In Settings > Privacy & Security, scroll down to the History section.
2. Next to the text Firefox will, select Use custom settings for history from the dropdown menu.
3. Check the highly critical box that explicitly says Clear history when Firefox closes.
4. Click the Settings… button immediately next to it to select exactly, precisely what you want aggressively cleared (Ensure Cookies, Cache, Active Logins, Browsing & Download History are all checked). Click OK.

7. Disable Dangerous Automatic Downloads

Highly malicious, compromised websites frequently attempt “drive-by downloads.” This is a devastating attack where malicious executable files or ransomware payloads are automatically, silently downloaded to your computer’s hard drive without your physical interaction or consent. Configuring Firefox to aggressively ask for your explicit, manual confirmation before downloading any file completely stops this massive attack vector dead in its tracks.

How to Enable:

1. Click on Settings > General in the left-hand sidebar.
2. Scroll down to the Files and Applications section.
3. Under the Downloads sub-header, firmly select the radio button labeled Always ask you where to save files.

8. Globally Block Location Access Requests

Modern websites constantly, aggressively ask for your physical, geographical location under the guise of providing “better local services” or “local weather.” However, this highly sensitive data is frequently abused, harvested, and sold to global advertisers to physically track your real-world movements. You can permanently, globally block websites from even asking for this highly invasive permission.

How to Enable:

1. In Settings > Privacy & Security, scroll down to the Permissions section.
2. Click the Settings… button immediately next to Location.
3. Check the highly critical box located at the very bottom that explicitly says Block new requests asking to access your location.
4. Click the blue Save Changes button.

9. Globally Block Camera Access Requests

Sophisticated malware, highly malicious browser exploits, and rogue websites can attempt to silently hijack your laptop’s physical webcam to spy on you. Globally blocking all camera requests keeps your camera completely disabled at the browser level for all websites, unless you explicitly, manually grant them temporary permission on a highly strict case-by-case basis (like for a specific Zoom web call).

How to Enable:

1. Under Settings > Privacy & Security > Permissions, click the Settings… button next to Camera.
2. Check the box located at the absolute bottom: Block new requests asking to access your camera.
3. Click the blue Save Changes button.

10. Globally Block Microphone Access Requests

Just exactly like camera access, your physical microphone access can be heavily exploited by rogue, invisible JavaScript to silently listen in on your physical environment, recording your private, real-world conversations and sending the audio to external servers.

How to Enable:

1. Under Settings > Privacy & Security > Permissions, click the Settings… button next to Microphone.
2. Check the box located at the absolute bottom: Block new requests asking to access your microphone.
3. Click the blue Save Changes button.

11. Globally Block Annoying Website Notifications

Almost every single modern website on the internet today instantly, annoyingly prompts you with a highly intrusive popup requesting to “Show Notifications” the absolute second you load the page. These notifications are rarely useful and are incredibly frequently abused by scammers to deliver highly malicious spam links or target you with aggressive, desktop-level advertisements. You can turn off these prompts completely and permanently.

How to Enable:

1. Under Settings > Privacy & Security > Permissions, click the Settings… button next to Notifications.
2. Check the highly critical box located at the absolute bottom: Block new requests asking to allow notifications.
3. Click the blue Save Changes button.

12. Disable Unnecessary Add-ons & Use a Real Password Manager

Browser extensions (Add-ons) are incredibly dangerous. They inherently require access to a massive amount of highly sensitive data to function, including reading the content of the pages you visit and physically logging the keys you press. The more extensions you have actively installed, the vastly wider your digital attack surface becomes. You must periodically, aggressively audit and completely disable any unnecessary add-ons.

Furthermore, you must absolutely never, ever rely on Firefox’s built-in password manager to save your highly sensitive credentials. Browser-based password managers are notoriously less secure than dedicated, heavily encrypted offline tools. Instead, disable the Firefox password manager and use a highly secure external vault.

How to Disable Add-ons:

1. Click the Menu button and select Add-ons and themes (or press the hotkey Ctrl+Shift+A / Cmd+Shift+A).
2. Click Extensions in the left-hand sidebar.
3. Aggressively toggle the blue switch entirely off for any extensions you do not use on a daily basis, or click the three dots and select Remove to delete them permanently.

13. Completely Disable Mozilla Telemetry & Data Collection

Mozilla explicitly collects telemetry data from your browser to monitor software performance, track usability metrics, and analyze crash statistics. While Mozilla is a highly trusted, deeply respected non-profit organization that respects user privacy, true, uncompromising OPSEC means sending absolutely zero telemetry data back to any external servers, no matter who owns them.

How to Enable:

1. In Settings > Privacy & Security, scroll deeply down to the Firefox Data Collection and Use section.
2. Aggressively uncheck absolutely all of the following tracking options:
   • Allow Firefox to send technical and interaction data to Mozilla
   • Allow Firefox to run and install studies
   • Allow Firefox to send backlogged crash reports on your behalf

14. Verify Total Cookie Protection (dFPI)

Firefox includes an incredibly revolutionary architectural feature called Total Cookie Protection (technically known as Dynamic First-Party Isolation). This brilliant technology aggressively confines all cookies strictly to the specific website where they were originally created. This creates a virtual “cookie jar” for every site, physically preventing massive trackers from illegally reading cookies from other sites to mathematically reconstruct your global browsing profile.

Total Cookie Protection is enabled entirely automatically when you use Firefox’s Standard or Strict tracking protection. By aggressively switching your browser to Strict Mode (as detailed in Step 1 of this masterclass), you have already successfully enabled Total Cookie Protection.

To visually confirm it is actively working, simply look for a solid green shield icon located directly next to the URL when browsing, representing highly active, mathematical isolation.

15. Enforce Permanent Private Browsing Mode

For extreme power users who demand maximum, absolute, paranoid security with absolutely zero traces ever left behind on their local operating system, you can deeply configure Firefox to run in permanent, unyielding Private Browsing mode. In this strict mode, Firefox will literally never mathematically remember your browsing history, caching cookies, highly sensitive search inputs, or saved form data. Every single time you close the browser, it is as if you just installed it fresh.

How to Enable:

1. In Settings > Privacy & Security, scroll back to the History section.
2. In the specific dropdown menu located directly next to Firefox will, select Use custom settings for history.
3. Check the highly critical box next to Always use private browsing mode.
4. Firefox will immediately prompt you to fully restart the browser. Once restarted, Firefox will run in private mode permanently, forever.

Summary Checklist: Secure Your Firefox Today

By aggressively applying these 15 meticulous settings, you successfully transform Firefox from a highly vulnerable, standard web browser into a heavily armored, hardened privacy tool capable of repelling massive surveillance networks.

For even greater, network-wide security protecting every single device in your home, consider exploring our masterclass guide on How to Implement Advanced Firewall Security to aggressively protect your entire household.