Support classic feedreader and mark feeds as read

I use tt-rss on Mobil phone and that works as expected. But while surfing on my desktop I like the dynamic RSS from Firefox.

Describe the problem you’re having:
I wish to see only unread feeds in the Firefox feedlist

If possible include steps to reproduce the problem:
At moment I create a public link from specific labels and put them into Firefox.

tt-rss version (including git commit id):
v17.4 (b0113ad)

Please provide any additional information below:
As far I know Firefox should support a http authentication of the feed-reader. If possible use tt-rss as Proxy so a clicked Link could be recognized and marked as read, redirect after that to the correct link.
If possible please allow to made an application password for that.