Hi Jane,

Sorry to hear that the page doesn't work as expected. In order to look for the root cause, please follow the steps below and provide us with more information to troubleshoot your issue.

1. Please check if you have Enhanced Tracking Protection (ETP) enabled. You can do that by clicking the shield icon at the left of the address bar.
   • If ETP is enabled, try disabling it. Does the problem persist?
2. If the problem is not fixed, try clearing Firefox cache. Does it help?
3. If it does not help, also try clearing cookies and data for the website you experience troubles with (warning: you will be logged out on this website). Does it help?
4. If it also does not help, try running Firefox in Troubleshoot Mode. Does the problem persist?

Looking forward to your update!

hello Denys and thank you for your reply. I tried all those things in order.

The one that made the difference was starting in trouble shoot mode. When in troubleshoot mode I saw the website's popup (see attached image).

So please now can you tell me what to do next? I do not want to run Firefox in troubleshoot mode all the time just to avoid this problem on this website.

If it is an extension which is doing this, how do I find out which one? I run Adblock, but I previously tried turning Adblock off and it makes no difference. So I don't think it is Adblock which is blocking the pop-up. In any case I have set Adblock to ignore this website and allow pop-ups on London Picture Archive. Even with Adblock off entirely I still get the problem.

What other extensions might be doing this?

Many thanks for your help.

Interesting... What are your settings? see screenshots The message is about cookies and I have Adblock Plus and Ghostery on with no issues. My privacy settings are really strict, but I'm not getting any messages.

Did you accept all? You can also click on preferences to see the settings.