Upon downloading the addon, you may see a warning like the one above. 

Don’t panic – it needs to do these things to work! uBlock Origin is trusted by millions, and it has a spotless reputation.

Click the “add” button to continue installing the software.

Note that nothing can block all adverts. Some ads – including dodgy ones – might still get through.

However, with uBlock Origin installed, your web experience will be faster, safer, and less annoying.