In response to Asa and mpt’s conversation, Basil rants that user interaction != user interface. Basil makes a good point: broken pages cause usability problems, regardless of whether it is the web developer or browser that is at fault. Having some indicator in Mozilla that the page has problems seems reasonable, but I sort of agree with Asa that users will think it reflects their feelings and will do nothing to help them. I doubt most users even notice the little triangle warning on the status bar in IE that says there are script errors. Still, informing the user is better than not. Even Asa is arguing for more information for the user when he describes the problems with installing plugins.