How to Block and Unblock Internet Sites with Firefox

Written by Jack Lloyd

Last Updated: December 24, 2019 Tested

This wikiHow teaches you how to block a website on your computer's Firefox browser. While there isn't a built-in way to do this in Firefox's settings, you can use an add-on called "Block Site" to block sites for you. You can use the same add-on to unblock the sites that you initially blocked later if you so choose. If you want to unblock a site that you didn't block in the first place, Firefox has a built-in VPN that you can use with an existing VPN subscription, or you can use a proxy site.

Method 1

Method 1 of 3:
Blocking and Unblocking Pages with Block Site

1
Open Firefox. Its app icon resembles a blue globe with an orange fox on it.
2
Go to the Block Site installation page. Block Site is a clean site-blocking add-on for your Firefox browser.

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3
Click Add to Firefox. It's a green button near the top of the page.
4
Click Add when prompted. You'll see this in the upper-left side of the page.
5
Click OK. Doing so will install Block Site in your Firefox browser.
6
Click ☰. It's in the top-right corner of the Firefox window. A drop-down menu will appear.
7
Click Add-ons. You'll find this option near the middle of the drop-down menu. Your Firefox add-ons' page will open.
8
Find the Block Site icon. It resembles a chain link and a red "restricted" sign. You may have to scroll down to find this.
9
Click Options. It's to the right of the Block Site icon.
- On Mac, click Preferences instead.
10
Scroll down and click the "Add domains manually to block list" field. This text field is near the bottom of the page.
11
Enter a website's address. Type in a website's address, making sure to include the "www." and ".com" (or ".org", or whatever the site's tag is) parts of the website's address.
- For example: to block Facebook, you would type in www.facebook.com here.
12
Click +. It's to the right of the text field. Doing so immediately adds the website and all of its associated pages to the block list.
- Repeat this process for other sites that you want to block.
13
Unblock sites on Block Site's list. If you decide that you want to unblock a previously blocked site, do the following:
- Click ☰
- Click Add-ons
- Find Block Site.
- Click Options or Preferences
- Scroll down to your list of blocked sites and find the site that you want to unblock.
- Click X to the right of the site.
14
Try to access a recently unblocked site. Click the address bar at the top of the Firefox window to select its contents, then type in the address of the website that you just unblocked and press ↵ Enter. You should now be able to open the site.
- If you can't access the site, you may need to close and re-open Firefox.
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Method 2

Method 2 of 3:
Unblocking Sites with a Proxy

1
Open Firefox. Its app icon resembles an orange fox on a blue background.
2
Open the HideMe site. Go to https://hide.me/en/proxy in your browser.
3
Enter a website's address. Type the address of a blocked website into the "Enter web address" text box that's in the middle of the page.
- You can also select a different country by clicking the "Proxy location" drop-down box and then clicking a new country in the resulting drop-down menu.
4
Click Visit anonymously. It's a yellow button below the text box. Doing so will begin loading your website.
5
Browse your site. Once the website loads, you should be able to use it like usual. Keep in mind, however, that your website's load times will likely be significantly slower than usual.

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Method 3

Method 3 of 3:
Unblocking Sites with a VPN

1
Open Firefox. Its app icon resembles an orange fox encircling a blue globe.
2
Click ☰. It's in the top-right corner of the Firefox window. Clicking it prompts a drop-down menu.
3
Click Options. You'll find this option near the middle of the drop-down menu. Doing so opens the Settings page.
- On a Mac or Linux computer, you'll instead click Preferences.
4
Click the General tab. It's on the left side of the page.
5
Scroll all the way down to the "Network Proxy" section. This section is at the very bottom of the "General" Settings page.
6
Click Settings…. It's to the right of the "Network Proxy" heading.
7
Check the "Manual proxy configuration" box. You'll find this near the top of the window.
8
Enter your VPN's address. Type your VPN's network address into the "HTTP Proxy" text box.
- If you don't have a subscription to a VPN service, you'll need to sign up for one before you can do this.
9
Select a port. Type your VPN's port into the "Port" text box.
10
Check the "Use this proxy server for all protocols" box. It's below the "HTTP Proxy" text box.
11
Click OK. Firefox will now use your VPN's address to reroute its traffic, which should help unblock most sites (including system administrator-blocked sites and region-locked sites) in your Firefox browser.

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Community Q&A

Question

How do I unblock the website?

Zildjian Recongco

Community Answer

Try to use a VPN. I always use browsec when I'm using a computer on our school to access YouTube and Facebook, it works and it's free to download, but it may affect your internet speed. If you have a high-speed internet that won't be a problem.
Question

How do I allow ads on one specific website with Firefox?

Community Answer

You can allow/block ads on any site with just an extension/add-on such as AdBlock or AdBlock+. If you would like to know how to use AdBlock then here are the instructions: If you're on a site in which you want to allow ads, click on the AdBlock extension icon, then disable it on the site you're currently on. If you're on a site in which you want to block ads, the AdBlock extension blocks all ads from all pages.

Warnings

There is no way to password-protect your Firefox extensions, so anyone with access to the Add-ons page can disable or remove the program.

Thanks!
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