I was trying to use the Web Feed icon that appears in the address bar to add a feed to Google Reader. Normally, this should not be difficult given there is an option to set Google as the default handler for Web Feeds in Applications tab of the Preferences. (I have Web Feeds set that way.)

The problem appears to be caused by the Delicious feature that hides the regular Firefox bookmarks menu. This feature also replaces the “Live Bookmarks” feed subscription option with a command to add a Delicious bookmark. That’s fine with me, except that no amount of changing Web Feed preferences will replace the “Live Bookmarks” command attached to the Web Feed icon with what I want.

(If I disable the Delicious Bookmarks add-on the preference does effect as expected and clicking the Web Feed icon redirects to the default reader.)

Update: Turns out this is a known issue and that a fix is being worked on.