You will need
  • - браузер Internet Explorer, Mozilla Firefox или Google Chrome
In Internet Explorer, click "Tools" > "Internet options" and select the tab "Content". Click on the "Settings" button, which is located in the section "Restricting access" and select the tab "approved sites". Enter the name of the site in field the "Allow viewing of the next node, and then click "Always." Now click "Apply". In the window that appears set the password and (optionally) a hint to him, to prevent access to the lock settings. To close the window "Limitation of access" and "Internet options", click in each of them OK.
In Mozilla Firefox press Ctrl+Shift+A. menu Opens add-ons Manager. In the search bar, which is located in the upper right corner, type "blocksite" and press Enter on the keyboard. In the search results, select Blocksite and click on the "Install" button, which is located on the right side of the row. After downloading the add-on, restart Mozilla Firefox, re-open the menu "Manage add-ons", select Blocksite and click "Settings". In the window that appears, click the Add button in the input field enter the desired website and click OK. Activate the Whitelist. To block access to the settings of this add-on, check the box next to Enable Authentication and enter a password in the New Password field. To save the changes click OK.
In Google Chrome click on the wrench, then Tools > Extensions. If you have already installed any of the plugins, click on "More extensions", if not "...view the gallery". In the new window, type in the search bar (located in the top right corner) "siteblock" and press Enter. In search results click on Siteblock, and in the appeared window – the button "add to Chrome". Again, go to extensions menu, find there Siteblock and click "Settings" next to it. In the input field enter the following:
Accordingly, instead of enter the desired website. To save the result, click Save Options.