This method seems to work for me for Forbes specifically on Windows (Mac people, do Cmd+R I guess, and maybe it'll work):
As soon as the pop-up appears, press ESC, and then F5 (reload window) immediately. Do this enough times, and eventually, the page will load with either no ads or else blanked out ads ;-) (And with your adblockers intact!)

@Julieanna -- You like CBD *and* PHP. Wow! beebop-boo-bee-bop ...

Damn, how come I never discovered this site before. StackX and LinkedIn are way too stuffy for me, though Reddit is cool. I like the specific ranty-pants focus of this though! :-)