Hi Pascal,
1. Try my TextNav addon for NVDA - It will skip most of the ads
automatically for you. As a bonus, you can also skip over menu items
and other junk on the web pages with it.
https://github.com/mltony/nvda-text-nav/releases/download/v1.0/textnav-1.0.nvda-addon
Promo audio and usage explanation (7 minutes audio):
https://soundcloud.com/user-977282820/textnav-promo
2. Alternatively, there are browser extensions that can remove ads for
you. AdBlock and AdBlock+ are the two I know, I think both have
versions for both Chrome and Firefox. Not quite sure about their
accessibility, but from what I remember, you just need to install them
and never touch them again - they'll filter all your traffic for you.

Best
Tony