file extension .jpg missing when downloading a fullsize image
When clicking on an image on /photos/[webname], one enters the fullscreen mode of the image. When clicking on the arrow sign [alt="share"], the "Download fullsize image" button appears. When clicking this button, the image file is downloaded, but the extension .jpg is missing, thus a user can not open the downloaded file immediately. He can add .jpg in the file name manually, but this is not how it should be. Tested with Firefox.
On Safari, the behavior is a bit different. After clicking on "Download fullsize image", the image is shown in the browser in a new tab, but there's no file downloaded. I guess this is the way how Safari treats files with no extensions.