Hi Pat, One of the best methods to block websites in your browser is by using add-ons. Here are the two most popular add-ons (of the same name) for this purpose: * [https://addons.mozilla.org/en-US/firefox/addon/block-website/?src=search Block Site by Ray (recommendend)] * [https://addons.mozilla.org/en-US/firefox/addon/blocksite/?src=search Blocksite by Blocksite] To add these to your mobile browser, you can pull up this page on your browser, tap on either link, and then hit the blue '''Add to Firefox''' button. If it's too much trouble to pull up this thread on your phone, tap the three dots in the top right corner of your browser > Add-ons > Browse Firefox's Recommended Extensions > Type "Block Site" in the search bar and tap on your preferred Add-on. Both of these add-ons will let you block certain domains in your browser, so it will most likely come down to your preference on which one to use.