This wikiHow teaches you how to block websites in the Firefox browser on a computer. While you can't do this through Firefox's settings, you can use an add-on called "Block Site" to block sites. This add-on can also be used to unblock sites that have been blocked if you wish. If you want to unblock sites blocked by the system, Firefox provides a built-in VPN that can be used if you have a VPN subscription. In addition, you can also use a proxy site (proxy).
Step
Method 1 of 3: Blocking and Unblocking Sites with Block Site
Step 1. Start Firefox
The icon is a blue globe surrounded by orange foxes.
Step 2. Visit the Block Site installation page
This site blocker add-on can be used safely in the Firefox browser.
Step 3. Click the green Add to Firefox button at the top of the page
Step 4. Click Add when prompted
It's in the upper-left side of the page.
Step 5. Click OK
Once you do that, Block Site will be installed in the Firefox browser.
Step 6. Click which is located in the top right corner of Firefox
A drop-down menu will appear.
Step 7. Click the Add-ons option located in the drop-down menu
The Firefox add-ons page will open.
Step 8. Look for the Block Site icon
The icon is a chain with a red prohibition sign. You may have to scroll down the screen to find it.
Step 9. Click Options located to the right of the Block Site icon
Click Preferences if you are using a Mac.
Step 10. Scroll down and click the " Add domains manually to block list " text field
This text field is at the bottom of the page.
Step 11. Type in the address of the desired site
Type in the site's address, and make sure you include "www." and ".com" (or ".org", or any site tag) which is part of its site address.
For example, type www.facebook.com here if you want to block Facebook
Step 12. Click the + to the right of the text field
The site you enter will be immediately added to the block list along with all associated pages.
Repeat the process to add any other sites you want to block
Step 13. Unblock the site in the Block Site list
If you want to unblock a site that has been blocked, perform the following steps:
- Click ☰
- choose Add-ons
- Look for Block Sites.
- Click Preferences or Options
- Browse the list of blocked sites and find the site you want to unblock.
- Click X which is to the right of the desired site.
Step 14. Try visiting an unblocked site
Click the address bar at the top of Firefox to block its content, then type in the address of the newly unblocked site, and press Enter. Now you can open the site.
If the site won't open, you may need to close and run Firefox again
Method 2 of 3: Unblocking Sites Using Proxies
Step 1. Start Firefox
The icon is an orange fox on a blue background.
Step 2. Visit the HideMe site
Run a web browser and visit
Step 3. Enter the desired site address
Type the address of the blocked site into the " Enter web address " text box in the middle of the page.
You can also select a different country by clicking the " Proxy location " drop-down box, then clicking another country in the drop-down menu that appears
Step 4. Click Visit anonymously
It's a yellow button below the text box. The site you entered will start loading.
Step 5. Browse the site
Once the site loads, you can browse it as usual. Keep in mind that your computer's speed for loading sites will be significantly reduced than usual.
Method 3 of 3: Unblocking Sites Using VPN
Step 1. Start Firefox
The icon is a blue globe surrounded by orange foxes.
Step 2. Click which is located in the top right corner of Firefox
A drop-down menu will be displayed.
Step 3. Click Options
It's in the middle of the drop-down menu. The Settings page will open.
Click Preferences if you are using Mac or Linux.
Step 4. Click General
This tab is on the left side of the page.
Step 5. Scroll down to the “Network Proxy” section
It's located at the very bottom of the "General" Settings page.
Step 6. Click Settings… which is to the right of the "Network Proxy" heading
Step 7. Check the box "Manual proxy configuration"
This option is at the top of the window.
Step 8. Enter the VPN address
Type your VPN's network address into the " HTTP Proxy " text box.
If you haven't subscribed to a VPN service yet, register first so you can perform this step
Step 9. Select the port (port)
Type your VPN port into the "Port" text box.
Step 10. Check the box "Use this proxy server for all protocols"
This option is below the "HTTP Proxy" text box.
Step 11. Click OK
Now Firefox will use that VPN address to reroute its traffic. This will unblock almost all websites in the Firefox browser (including sites blocked by the system administrator and sites that cannot be opened in certain areas).
Tips
- If using Block Site, you can right-click an empty spot on the desired site, then click Block this domain in the menu that appears to add the site to the Block Site list.
- If you want to temporarily disable Block Site blocking, you can click Disable which is on the right side of Block Site in the Add-ons.
