You have to give instructions on where your doing your settings at so others can follow and also link to the site would help others see if there is a problem is browser or site issue.

Well, here's my current settings for Content Blocking, as for the site it's https://www.notebookcheck.net/

You can check the Web Console for possible messages about blocked content.

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en-US/Tools/Web_Console

Are there third-party cookies blocked on this website?

I'm not seeing this message, even with Content Blocking enabled and over 300 warnings in the Web Console about blocked content. If I only enable Logs in the Web Console then I notice messages about "Enabling malvertisement scanner" and other messages."Bidding over. Calling ad server...".

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en-US/Tools/Web_Console

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Ow apparently Windscribe VPN add-on got their own built in adblocker. I found this after restarting on Safe Mode. Thanks for your help.

You're welcome.