Can you provide sites so that we can see if we can replicate the issue? Also, post screenshots showing the issue.

Hi Jayhawk714, I don't believe that Firefox has any in-built adblocking system. Have you got any add-ons installed? You may want to try disabling any that have ad-blocking features ([[Disable or remove Add-ons]]). Alternatively, sometimes VPNs and security software, like Kapersky Total Security, have settings which block ads. If the problem still persists, it may be worth actually installing an ad-blocker extension if you haven't already, as they can remove pop-up messages. You can view a list of recommended privacy add-ons [https://addons.mozilla.org/en-GB/firefox/extensions/category/privacy-security/?promoted=recommended&sort=recommended%2Cusers here]. Hope this helps!