How do you browse and upload a photo from an iPhoto Library to a website using a browser like Safari, Chrome, Firefox, etc I've at a site that wants me to upload a photo.  I choose Browse... but when I get to iPhoto Library, it's opaque.  Is there some way to browse and choose one?
The iPhoto Library folder can not be browsed directly. In Finder you can open/access it by righ-clicking and selecting the "Show Package Content" option, but this is not possible in the Open dialog.

But there is an easier way: you can access the content of your iPhoto Library directly from the file browser in the Open dialog:



This also gives you all your events, albums etc. to browse through.