Close All Web Browsers -> Open My Computer -> go to Windows Drive (C:\) -> Windows -> System32 -> drivers -> etc -> open "hosts" file in Notepad -> at the end of the file write

127.0.0.1 www.xyz.com

xyz = the website you want to block

Save the file and exit. Now restart your web browser. Check and tell if its working.

You could use this extension to "block" within Firefox and only for Firefox.
https://addons.mozilla.org/en-US/firefox/addon/blocksite/

The HOSTS file will affect all browsers in that PC equally.

tnx a lot.......it works.......

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