Goodbye trackers

How to enable ‘Content Blocking’ feature in Firefox

Mozilla Firefox has a new content blocking feature to protect your privacy online, and in this guide, you'll learn the steps to enable and configure the level of protection that's right for you.

Firefox content blocking feature

Starting with version 67, Firefox is also focusing on improving privacy to block web trackers from collecting data about you when surfing the internet.

Mozilla is improving privacy with “Content Blocking,” a new feature that allows to choose among three different levels of privacy, including standard, strict, and custom to prevent malicious and advertisement companies from collecting your activities and other valuable information.

While the new content blocking feature comes enabled by default using the “Standard” level that offers a balance of privacy and performance, the level of tracking will be different depending on the option you select.

In this guide, you’ll learn the steps to enable and configure the tracking prevention feature in Firefox for Windows 10 as well as for Windows 8.1, Windows 7, Linux, and macOS. (Microsoft Edge (built on Chromium) also includes a similar feature, which you can configure with these steps.)

How to enable content blocking in Firefox

Use these steps to configure the online tracking prevention level when in Firefox:

  1. Open Firefox.

  2. Click the Settings hamburger button in the top-right corner.

  3. Click on Options.

  4. Click on Privacy & Security.

  5. Under the “Content Blocking” section, select the tracking prevention level:

    Firefox Content Blocking settings
    Firefox Content Blocking settings
    • Standard — (default) blocks known trackers in private windows and third-party tracking cookies.
    • Strict — blocks trackers in all windows and third-party tracking cookies. However, using this option may result on some websites no to work correctly.
    • Custom — allows you to specify what to block. Also, using this option, you can disable all content blocking, including trackers, cookies, cryptominers, and fingerprints.
  6. Click the Reload All Tabs button (if applicable).

  7. (Optional) Click the Manage Exceptions button in the bottom right.

  8. Select the website that you allow trackers when privacy prevention is enabled.

  9. Click the Save Changes button.

Once you complete the steps, you should be able to browse the web without worrying about malicious trackers, and you should starting seeing less targeted advertisements.

How to customize content blocking in Firefox

Use these steps to disable or customize content blocking in Firefox:

  1. Open Firefox.

  2. Click the Settings hamburger button in the top-right corner.

  3. Click on Options.

  4. Click on Privacy & Security.

  5. Under the “Content Blocking” section, select the Custom option.

  6. Check the Trackers option. (Usually, “Trackers” refers to content, cookies, or scripts that can collect your browsing data across multiple websites.)

  7. Use the drop-down menu on the right and select the In all windows option.

  8. (Optional) Click the Change block list option.

    Firefox block list settings
    Firefox block list settings
  9. Select the “Diconnect.me” list that Firefox should use to block content:

    Firefox Disconnect.me block lists
    Firefox Disconnect.me block lists
    • Level 1 block list — (Recommended) allows some trackers so fewer websites break.
    • Level 2 block list — blocks all detected trackers. Some websites or content may not load properly.
  10. Check the Cookies options.

  11. Use the drop-down menu on the right and select the Third-party trackers option. However, you can also select to block cookies from unvisited websites, all third-parties, or even all cookies, but these option may break the functionality of some websites. (Advertisers most commonly use these third-party cookies to track you across multiple websites and target you with ads.)

    Firefox Content Blocking cookies settings
    Firefox Content Blocking cookies settings
  12. Check the Cryptominers option to prevent malicious individuals to invisibly mine cryptocurrency with your computer.

  13. Check the Fingerprinters option to prevent websites from collecting information about your browser and device configuration, such as your OS, screen resolution, and other settings. By compiling these pieces of data, companies create a unique profile of you that can be used to track you around the web.

  14. Click the Reload All Tabs button.

After you complete the steps, Firefox will start blocking harmful scripts as well as other trackers making sites load faster while protecting your privacy, but these settings can affect the web page functionality.

How to disable content blocking in Firefox

Firefox online tracking prevention feature comes enabled by default, but if this isn’t for you, it’s possible to disable “Content Blocking” with these steps:

  1. Open Firefox.

  2. Click the Settings hamburger button in the top-right corner.

  3. Click on Options.

  4. Click on Privacy & Security.

  5. Under the “Content Blocking” section, select the Custom option.

  6. Clear the Trackers option.

  7. Clear the Cookies option.

  8. Clear the Cryptominers option.

  9. Clear the Fingerprinters option.

    Disable Firefox Content Blocking feature
    Disable Firefox Content Blocking feature
  10. Click the Reload All Tabs button.

Once you complete the steps, “Content Blocking” in Firefox will be disabled entirely allowing websites to track your activities.