Rated 3 out of 5 stars
My lovely wife (it is her who acrually uses the extension, but she is too shy to write here) have found the solution to feed refresh hanging problem:
Open NewsFox settings dialog, "Feeds/Articles" tab, set "Feed refresh" -> renewal (seconds) to 0.
By the way, the Russian translation is not correct here, the "threads" setting name is translated to Russian as "feeds".
Last update of NewsFox - not updating feeds Rated 3 out of 5 stars
Yes, garsh, NewsFox hangs on updating every feed. :(This review is for a previous version of the add-on (18.104.22.168.2.1-signed).