Extension? What do you mean?

If you mean a RSS self-hosted application, then the developers of FreshRSS and miniflux are both French, so both are based in France.

I like Commafeed: https://www.commafeed.com/

I realize the Github page isn't listed on that site, so here it is: https://github.com/Athou/commafeed

By extension I meant something with a browser extension ideally.

I don’t want to self host. Thanks for the sugggestions.

I'm not quite certain what you mean either, but I've been very happy with NextRSS that could be installed in my Hetzner-hosted Nextcloud instance. Granted, I use it through the Android app, but of course it has a web UI as well.

Not all (any?) of the free Nextcloud hosts allow installing the news app/extension though.

Capy Reader. Phone app with filters. Lets you limit news to phone hours.

I'm not sure what you mean, I use Feeder on android, that's all I need. Can recommend. No need to self host anything...?