That's not for Firefox forum user to help with - if you need to do what your asking you can look online search and there will be links talking about what your asking and what methods to use. This is beyond Firefox forum browser issues itself.

Hi Sam

Making sure you have tracking protection turned on will help and this guide will walk you through how to do this:

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop

If you want to block adverts more comprehensively, an add-on such as uBlock Origin will help.