Thank you very much Pondus and Polonus
I attached here the popup warning.
The "logs to assist in cleaning" tells me to open "Malwarebytes Anti-Malware" and you ask me, Pondus, about the popup warning, so before opening it, I rather wait for your answear about the popup.
It is curious that not always the popup appears in the articles or photos of Xinhua and after I move downward the display of an interior page to continue the reading, the pop up may not appear anymore for other pages.
Polonus thank you, any additional clue to interpret and use your information?
Thank you again for your kind help.