Showing a random photo from the past is a nice feature. Used to have it on an Android tablet where an idle lock screen slideshow allowed this. There are also wi

Showing a random photo from the past is a nice feature. Used to have it on an Android tablet where an idle lock screen slideshow allowed this. There are also windows in different programs where I don't mind having a random picture as a background. Looks like a "New tab" page in the browser is ok for this. Anyone know how to set this up in Firefox?