NOTE: Using Ubuntu 7.04, but should be a Gnome-specific issue.
I want to move from using Evolution to web-based email at inbox.com. I have a mail notification applet running that checks my inbox.com account. When I get a new email, I can click on the applet to have it load up my preferred email application (as specified in the System->Preferences->Preferred Applications setting). Now, instead of having Evolution pop up, I want it to load inbox.com on Firefox.
So what I've done so far is go into that Preferred Applications setting and added a custom command: firefox www.inbox.com
When I click my notifier applet, it runs Firefox. Unfortunately, it ignores the url I attached. I've tried all variations that I can think of. The kicker? This works perfectly from the terminal, but not when it's loading as the "preferred application".