How to block a website on Firefox Desktop and Mobile

Featured - How to Block a Website in Mozilla Firefox

While the sites we frequent tend to be of high quality, the truth is, the internet is full of low quality content, spam, and even malicious content. It also has a lot of hazardous work-related content that you might not want employees of younger family members to access. If you are a regular user of Mozilla browser then knowing how to block a website on Firefox and Mobile is extremely useful. This is what we will show you today.

Before we begin, however, there is something important to note. As of this writing, there is no built-in way to effectively block websites in the Firefox desktop. Instead, you’ll need to install a third-party extension and allow it to access your browsing data.

If this makes you uncomfortable, we recommend using a different browser on desktop and mobile, such as Opera.

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With that said, here’s how to block a website on Firefox for desktop and mobile:

How to block a website on Firefox Desktop

Although you need to download a Firefox site blocker extension to shut down websites, it is very straightforward and it is straightforward to use. You can even block websites at certain times of the day, such as blocking YouTube while you are working. Here’s how:

  1. Install the Firefox Blocking Site add-on

    Go to the Firefox add-on store and type “Block the site” in the search bar. The plugin we’ll be using is called Block Site by a user called Ray. We recommend that you click on it in the list and install it to be able to follow along.

    Windows 10 - Firefox - Add-ons - Block site

  2. Press “Add to Firefox”

    Windows 10 - Firefox - Add-ons - Block site - Add to Firefox

  3. Click “Add” to accept permission prompts

    Windows 10 - Firefox - Add-ons - Block site - Add to Firefox

  4. Press “OK” until the prompt “Block site has been added”

    Windows 10 - Firefox - Add-ons - Block site - Add to Firefox - Add - OK

  5. Open your add-on settings

    You can do this by tapping on the hamburger menu at the top right and then clicking on “Complementary modules and themes”, or by pressing Ctrl + Shift + A.

    Windows 10 - Firefox - Add-ons - Block site - Add to Firefox - Add - OK - More - Add-ons appear

  6. OR: type “about: addons” in your URL bar

    Windows 10 - Firefox - about addons

  7. Click on “Extensions” in the right sidebar

    Windows 10 - Firefox - aboutaddons - Extensions

  8. Tap the three dots next to the Block Site Firefox extension

    Windows 10 - Firefox - aboutaddons - Extensions - Three Point Blocking Site

  9. Click on “Options”

    Windows 10 - Firefox - aboutaddons - Extensions - Three point blocking site - Options

  10. Enter the website you want to block in the “Add rule” field and press “Add”

    You can also adjust the blocking schedule if you want to block sites on certain days and times.

    Windows 10 - Firefox - aboutaddons - Extensions - Three dots Block site - Options - Add site

  11. Scroll down to the “Tools” section and press “Save options”

    Windows 10 - Firefox - aboutaddons - Extensions - Three dots Block site - Options - Add site - Save

  12. Try to access the blocked site

    If your Firefox website blocker is working correctly, you should get the following message:

    Windows 10 - Firefox - aboutaddons - Extensions - Three dots Block site - Options - Add site - Save - Result

How to block a website on Firefox Mobile

The method to block a website on Firefox mobile is a bit different. If you are using Android, you can add a free extension called Leechblock NG to your mobile browser. It works pretty much the same as Site Blocker above.

If you’re using iOS or iPad OS, you can use the built-in Screen Time tool instead. Just keep in mind that this will block sites on all browsers, not just Firefox. It will also apply to any device using your iCloud account, so beware. Here is how you can use it:

  1. Open the settings and press “Sceen Time> Content and Privacy Restrictions”

    Activate the option that says “Content and Confidentiality Restrictions” and press the “Content restrictions” heading below.

    Android - Leechblock NG - Content and Privacy Restrictions - Content Restrictions

  2. Tap the “Web Content” heading in the list of content restrictions

    Android - Leechblock NG - Content and Privacy Restrictions - Content Restrictions - Web Content

  3. Tap “Limit Adult Websites” and tap “Add Website” under “Never Allow”

    Android - Leechblock NG - Content and Privacy Restrictions - Content Restrictions - Web Content - Limit Adult Websites - Add Website

  4. Type in the URL of the website you want to block and press “Done”

    When you try to visit the website, you should now receive the notification that it has been blocked.

    Android - Leechblock NG - Content & Privacy Restrictions - Content Restrictions - Web Content - Limit Adult Websites - Add Website - Url - Done

How to change the default search engine and clear cookies / cache

Now that you know how to block a website on Firefox, you might want to change some other aspect of your browser. While you’re here, feel free to check out our guides on how to change the default search engine and clear cookies, cache, and site data.

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