[defa]

Why do browsers in general have such a bad UI feedback while uploading files? If you have a very slow connection or a very large file (or worse both!) than you browser keeps working for ages without an appropriate feedback. Neither in OmniWeb nor in Safari you have any kind of feedback how much of your data has been delivered or how long the delivery is expected to take.

Some thoughts on how to provide the best feedback to the user should be done... but a simple progress-bar and a ETA would be nice. Since uploads can take a very long time a confirmation dialog would be helpful for actions that would abort the upload.

Maybe a sheet would be nice during upload but that wouldn't work with tabbed browsing, right? What about dimming the background like dashboard and showing a progress-bar with a cancel button?

No browser that I know of handles file uploads well.