I tried to open Wine RSS in Opera 10 beta 2 (build 1691) and found a bug in Wine
RSS related to language / locale.
http://img406.imageshack.us/img406/3939/winerssopera.jpg
It means
"Error in XML parsing! (Line: 43, character: 46)
Treat the document as HTML and show again."
As you can see in line 43, there is an error with Polish text "Wydanie
rozwojowe Wine 1.1.26 jest ju| dostpne." (which means "The Wine
development release 1.1.26 is now available.") It obviously fails at
parsing Polish characters like "|" or further "".
When I click "Treat the document as HTML and show again." or if I just
refresh the page, I can load it properly.
As a proof, I changed the language in Opera to English and the site loaded
instantly without any errors. Setting the language back to Polish allows me to
reproduce the error.
Looks like that's why Firefox didn't manage to view RSS feed. I hope it
will be fixed soon :-)