Amazing! Been using this for years, and recently it has been updated to work again on Firefox (after Chrome was updated already). Keep up the amazing work, I've sent you a donation again. Even better would be if you could make it available for Firefox Mobile as well :-D. Probably not in yours hands though. Or an alternative Marktplaats app that works on mobile, without the ads. Marktplaats on mobile really is unusable in my opinion.