This is a decent replacement for the old built-in Firefox RSS lists, but there is one major problem for me: it doesn't let me scan a lot of headlines at once, which is the main purpose of RSS.
MOST stories are listed repeatedly 2 through 7 times, and there are 3 lines for each headline listing, so on my 17" screen laptop with standard 100% sized windows, I'm seeing only 14 headlines of which there are only 5 different ones for ABC New Top Stories. One of the three lines for each headline tells me it's from ABC News Top Stories - which it shouldn't need to do - and other is a blank line.