Hello fribir,

Unfortunatly that screenshot failed to upload - would you try again please  ?

In the mean time : When you're on that site, do you see a shield icon between the padlock and the 'i' in a circle  ?

If not : that means that the site is not blocked .....

no, there is no shield, BUT there is NEVER such a shield, even when in "settings" I choose the most severe rerstictions.

Nevertheless I have no access to some contents because "tracking block" is active.

Would you please do this :

Options => Privacy & Security => under 'History' choose : 'Use custom settings for history' and make sure that 'Always use private browsing mode' is unchecked.

You will then have to restart Firefox.

The shield icon should now appear .....

I just found the reason for this behaviour of Firefox: My anti-virus programm (Avast) has an online-security feature where all trackers were blocked, Firefox could not do anything to unblock. I diabled this particular feature of Avast and now Firefox works as expected! Maybe helpful to others a well! best regards fribir

Well done you  !

But also remember to make sure that you're not in permanent private browsing mode .....

I noticed that you marked my post as Chosen Solution, but it is your post that should be marked as such  !

You can rectify it by clicking on the 'Undo' button to the right of that post and then mark your own (last) post as Chosen Solution.

Again : well done  !

In addition a personal note :

You'd be better off removing Avast and just use Windows built-in Defender and maybe let malwarebytes run a scan once a month.

Also see :

http://tech.firstpost.com/news-analysis/ex-mozilla-firefox-developer-says-anti-virus-software-does-more-harm-than-good-359798.html

And : https://www.howtogeek.com/239950/dont-use-your-antivirus-browser-extensions-they-can-actually-make-you-less-safe/

Note that you can select more precisely what to block under the "Cookies and Site Data" section.