Facebook makes a very good image host if you want to hotlink an image on your own website and you want to save bandwidth. Just upload the image and view it in a large size and then right-click the image and click open in new tab and get the URL that way. Then you can put the image on your website and show it off without having to upload the image to your own website as Facebook allows hotlinking.
To save an image from Firefox to the desktop easily, just drag the image from the Firefox window to the desktop and it will be saved there. This works on Linux and Windows.
I have been having problems getting to my Youtube inbox with the Chromium browser so I created a bookmark with this link: http://www.youtube.com/inbox. That did the trick.