Using FF 56.0.1 (tested in a clean profile too) with GM 3.17 and script v7.2.0.

Yesterday, an extra tab, 'Discover repositories' was added in the News Feed (blog post).
Unfortunately, this has broken the script functionality:

• all counters in the 'News feed filter' table now have zero values, and,
• clicking any filter entry, no filtering is applied to the news feed.

There's no entry in Browser Console when this happens.

@jerone, it would be great if you fixed the script, to work with the new layout. I love your script!