Note: this extension will only work on chromium based browsers for ex: chrome, opera, brave ETC..., now you should write on your browser chrome://extensions and enter. this will take you to the extensions section on your browser. when you get to the extensions page, at the top right there is a developer mode switch, turn it on. and then 3 options will appear on the top left, click the button that says "load unpacked" and then select the "Katrom-Blocker official" folder that appeared once you extracted the zip file, and then press "select" or "open" and you're good to go. There you have the new Katrom-Blocker extension!!!!
Note: In case the ad-blocker didn't work at first you put it . you will find a refresh/reload button/icon right next to the remove button press it and you're good to go!!!!