Hello mar685,

Reason could be that maybe you're using Tracking Protection, in which case you should turn it off.

See : https://support.mozilla.org/en-US/kb/tracking-protection

Does that make a difference  ?

Thanks for your reply but unfortunately it didn't help. Maybe I have to reboot in order for the change to take place. Will try.

mar685 said

Thanks for your reply but unfortunately it didn't help. Maybe I have to reboot in order for the change to take place. Will try.

If it didn't help, then please remove the "Chosen Solution" mark from my post - just click the "Undo" button to the right of the post.

Maybe you could try the suggestions in this thread about the same problem :

https://support.mozilla.org/en-US/questions/1233486

In addition (and it's a stab in the dark) :

Maybe some ads will be read as pop-ups - would you go to Preferences => Privacy & Security, and under "Permissions" uncheck "Block pop-up windows".

Does that make a difference  ?