Just wondering if anyone has experienced this same problem and might have an answer...
I recently upgraded both Ubuntu (to 11.10) and Firefox (to 8.0), so I'm not sure which one (if any) is the culprit. In my Run>Config dialog box I have the following settings for firing up my (Thin) server:
IP Address: 0.0.0.0
Run browser: checked
Run browser field: http://0.0.0.0:3000
This config has worked for as long as I can remember, however, now when I fire up the server Firefox still gets started, but I get a "Firefox can't find the server at www.%u.com" error.