Odd advert behaviour

Getting this pop up on some pages, usually alongside a request to use WebGL graphics, which I've got set to request use rather than automatic since that seems to have solved problems with adverts taking up most of my increasingly aged resources.

Happened in the last couple of days - no system changes my end
Screen Shot 2018-09-23 at 21.24.55.png


Book Reviewer
The certificate of the ad site expired on the 18th. Looks quite mundane. Shame sites with expired certificates aren't hoofed server side.

But my skills are lapsed.

Similar threads