Correct: it's not related to any specific browser.
In this case, you would only exposed if you phone the number on the "warning" page and follow their instructions to "clean" your system by handing over remote control, or downloading/installing their "patch".
But yes, it's surely an annoyance.
I haven't seen it since disabling the second ad network. But I was only seeing it maybe once a week or so.
View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)