Normally I use www.bloglines.com to read feeds. Today I wanted to subscribe to a intranet local RSS feed, I choosed Thunderbird as the aggregator of choice. The handy subscribe feature in Firefox 2.0 didn't show Thunderbird as an application. Choosing it by "Choose application..." didn't do what I expected. Thunderbird popped up but didn't subscribe to the feed. In settings about:config:browser.feeds.handlers.application has Thunderbird set now as an application, but how to make it work? Adding "%s" - similar to the other settings - to the config value didn't help.