AFAIK, SeaMonkey (a sister-browser of FF from Moz) has RSS integrated (along many other things), also, Thunderbird is the one to handle RSS from the Thunderbird-Firefox duo.
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AFAIK, SeaMonkey (a sister-browser of FF from Moz) has RSS integrated (along many other things), also, Thunderbird is the one to handle RSS from the Thunderbird-Firefox duo.