how to use this script??

This is actually not a script, it is just a library that can be used by other scripts:

• The main script is here: https://greasyfork.org/en/scripts/13881-highlight-och-links It is a link checker that checks whether links are online or offline. If you install that script, you can press the Escape key on your keyboard on any website and the script will highlight all online links in green and offline links in red.

There are also two download helpers, but they are only useful if you have a nopremium.pl or premiumize.me account:

• https://greasyfork.org/en/scripts/13884-multi-och-helper
• https://greasyfork.org/en/scripts/13882-multi-och-helper-highlight-links