Go and view the items in those feeds. Then Liferea should either crash or print an error in the terminal.
I should also say that I can't reproduce it in gutsy (not sure in feisty), though I could some time ago in Feisty. I've noticed that I don't have sun-java-* installed, so I've installed it, and still can't reproduce it.
Steps to reproduce:
Launch liferea from the terminal (because it might not crash for some people):
$ liferea
Add the following feeds: radiofrance- podcast. net/podcast/ rss_16277. xml feeds.feedburne r.com/CommeCaDu Japon
http://
http://
Go and view the items in those feeds. Then Liferea should either crash or print an error in the terminal.
I should also say that I can't reproduce it in gutsy (not sure in feisty), though I could some time ago in Feisty. I've noticed that I don't have sun-java-* installed, so I've installed it, and still can't reproduce it.