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How to Block Websites on Firefox

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Although Firefox does not have a website blocking function, you can install an extension to detect and block websites with adult and restricted content. If you need a more comprehensive method, you can edit the hosts file to block the site on multiple browsers. If you need to block on multiple devices on the network, using a service like OpenDNS is the most effective way.

Using BlockSite

Image titled Block Websites on Firefox Step 1

Image titled Block Websites on Firefox Step 1

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Start Firefox on the computer. You can install many extensions on Firefox to block websites. These utilities are only supported on the desktop version. This method will focus on the popular utility BlockSite, which allows you to block specified websites.

  • Firefox extensions can be bypassed quite simply and only take effect on Firefox. If you want to block all access to that website on all browsers in use, you should refer to another method in this article.
Image titled Block Websites on Firefox Step 2

Image titled Block Websites on Firefox Step 2

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Click the Menu button (☰) and select “Add-ons” . This is the operation that opens a new tab showing the installed plugin.
Image titled Block Websites on Firefox Step 3

Image titled Block Websites on Firefox Step 3

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Click on the “Get Add-ons” tab on the left side of the screen. You will see some add-ons on Firefox.
Image titled Block Websites on Firefox Step 4

Image titled Block Websites on Firefox Step 4

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Click on “See more add-ons” at the bottom of the page. This is the operation to open a new tab displaying the convenience store.
Image titled Block Websites on Firefox Step 5

Image titled Block Websites on Firefox Step 5

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Find “BlockSite.” The screen will display the BlockSite utility, which helps you block websites quickly.

  • There are many utilities that block and filter websites. If you are not satisfied with BlockSite, try searching “site block” and “parental contrp” to find another extension.
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Image titled Block Websites on Firefox Step 6

Image titled Block Websites on Firefox Step 6

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Click the “Add to Firefox” and “Install” buttons. This is the operation to install BlockSite into Firefox.
Image titled Block Websites on Firefox Step 7

Image titled Block Websites on Firefox Step 7

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Start Firefox. You are required to restart Firefox after installing the extension.
Image titled Block Websites on Firefox Step 8

Image titled Block Websites on Firefox Step 8

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Click on “I don’t want to help” in the new tab. This option prevents your browsing data from being sent to BlockSite.
Image titled Block Websites on Firefox Step 9

Image titled Block Websites on Firefox Step 9

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Open BlockSite settings. Go back to the Add-ons tab and click on the “Extensions” item. From here, click on “Options” next to “Block site.”
Image titled Block Websites on Firefox Step 10

Image titled Block Websites on Firefox Step 10

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Set up a password. Check the “Enable authentication” dialog box to set up a password. Enter the password you want to use in the corresponding field. Anyone using Firefox is required to enter this password when they want to access BlockSite settings.
Image titled Block Websites on Firefox Step 11

Image titled Block Websites on Firefox Step 11

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Choose between “Blacklist” and “Whitelist” . When using blacklist, any added websites are blocked. When using whitelist, on the contrary, the entire website is blocked except for the added website. Whitelisting is more effective when you want to restrict your children to only view certain safe websites.
Image titled Block Websites on Firefox Step 12

Image titled Block Websites on Firefox Step 12

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Add the site to the list. Click the “Add” button and type or paste the website address into the corresponding field. This is to add the website to the blacklist or whitelist, depending on your settings.

  • You can use wildcard to block multiple websites respectively. For example, to block any pages with the word “drugs” in the address, you would type *drugs* .

Edit the hosts file

Image titled Block Websites on Firefox Step 13

Image titled Block Websites on Firefox Step 13

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Open the hosts file. The file allows you to redirect the route from a specific website to an internal address, and effectively block the web. This method affects all computer users. Editing the hosts file is only really effective when you need to block a few pages.

  • Windows – Navigate to C:WindowsSystem32driversetc and double click on the hosts file. If asked to choose a program to open the file, select “Notepad.”
  • macOS – Open Terminal in the Utilities folder. Type sudo nano /etc/hosts and enter the password when prompted. This is to open the file in the editor.
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Image titled Block Websites on Firefox Step 14

Image titled Block Websites on Firefox Step 14

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Add a new line at the end of the file. Add the website you want to block in a new line at the end of the file.
Image titled Block Websites on Firefox Step 15

Image titled Block Websites on Firefox Step 15

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Type 127.0.0.1 <site> . For example, to block Facebook, you type 127.0.0.1 www.facebook.com .
Image titled Block Websites on Firefox Step 16

Image titled Block Websites on Firefox Step 16

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Add more pages to the new line. You can continue to add new lines to the file, one page per line. Don’t forget to add 127.0.0.1 to each line.

  • You should also block the mobile version of that site. For example, if you block Facebook, block m.facebook.com as well.
Image titled Block Websites on Firefox Step 17

Image titled Block Websites on Firefox Step 17

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Save the file when done. Once you’ve finished editing the file, you need to save your changes:

  • Windows – Press Ctrl + S or choose “Save” in the File menu.
  • macOS – press Ctrl + X and select “Yes” when asked to save the file. Use the old name to overwrite the original file.
Image titled Block Websites on Firefox Step 18

Image titled Block Websites on Firefox Step 18

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Review. After changing the hosts file, you can test the website in any browser, the website will be redirected to a blank page. This method affects all users on the computer and also private browsers. [1]

Using OpenDNS

Image titled Block Websites on Firefox Step 19

Image titled Block Websites on Firefox Step 19

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Go to the OpenDNS website. OpenDNS is a DNS service that redirects websites that contain adult or restricted content. This method allows you to block your website from all users on the same network no matter what browser or device they use. OpenDNS is a free service.

  • Go to opendns.com in your browser.
Image titled Block Websites on Firefox Step 20

Image titled Block Websites on Firefox Step 20

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Select “Personal” on the OpenDNS website. You will see different personal use plans.
Image titled Block Websites on Firefox Step 21

Image titled Block Websites on Firefox Step 21

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Select “OpenDNS Family Shield” (OpenDNS Family Shield). This is a pre-configured filter to block websites with adult or inappropriate content in the home network.
Image titled Block Websites on Firefox Step 22

Image titled Block Websites on Firefox Step 22

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Select “Home routers” . This is an option that lists the specific setup instructions of many popular routers.
Image titled Block Websites on Firefox Step 23

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Image titled Block Websites on Firefox Step 23

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Find the router you are using in the list. If you don’t know your router, or can’t find it in the list, select “FamilyShield Router Configuration Instructions”.
Image titled Block Websites on Firefox Step 24

Image titled Block Websites on Firefox Step 24

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Open the router configuration page. The process depends on the router and network setup. See the article Accessing the router for detailed instructions.

  • Normally, you enter the router’s IP address into a web browser, log in with the username and password to access the configuration page.
Image titled Block Websites on Firefox Step 25

Image titled Block Websites on Firefox Step 25

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Open the “Internet” or “WAN” section. This section contains the DNS settings for the router.
Image titled Block Websites on Firefox Step 26

Image titled Block Websites on Firefox Step 26

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Disable automatic DNS. Many routers enable DNS automatically. You need to disable it before manually entering the DNS server.
Image titled Block Websites on Firefox Step 27

Image titled Block Websites on Firefox Step 27

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Enter the two DNS servers below. Enter the address below in the 2 corresponding DNS fields:

  • 208.67.222.123
  • 208.67.220.123
Image titled Block Websites on Firefox Step 28

Image titled Block Websites on Firefox Step 28

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Click “Apply” or “Save Changes” . This is to apply the new settings and restart the router. You may have to wait a minute to get online.
  • Image titled Block Websites on Firefox Step 29

    Image titled Block Websites on Firefox Step 29

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    Review. The DNS server will automatically redirect access to the blocked site. Test import a website with adult content to make sure it works. [2]

    • Although Firefox does not have a website blocking function, you can install an extension to detect and block websites with adult and restricted content. If you need a more comprehensive method, you can edit the hosts file to block the site on multiple browsers. If you need to block on multiple devices on the network, using a service like OpenDNS is the most effective way.

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