Request for enhancement: at the bottom of the mozilla window, display an icon indicating whether the page is valid html or not. I imagine small icons without bright colors, with a number (html version) and a green check mark for valid html and a red X for invalid html. When displaying a blank page, the area would be blank. When displaying an image, mozilla could leave the area blank or put a "gif", "png", etc. icon in the same location. Double-clicking the icon should explain why incorrect html is incorrect, and always give users the option of turning off the feature (along with instructions on where to find the option in preferences if they want to turn it back on). This feature would help mozilla testers figure out why pages are displaying differently in different browsers (is the html bogus, or is one of the browsers messing up?) If on by default, it would also encourage webpage builders to write html that displays as intended on all compliant browsers.
This would be nice. Perhaps a friently green mozilla in the throbber for valid page and a steaming red one for the page with errors/quirks/... This would make the throbber actually useful :)
verified dupe of bug 6211