New feature: Close tab after save

[asdf-456]

Hi there, great job! Im wondering is there is any chance to add one option to close the tab after saving one image.

Thanks a lot.-

[Martii]

@benbasson
Heya... a rough version of this enhancement is available on my SF repo near-parallel fork of your extension... granted it could use some improvement especially in the arena of when the common dialogs close before the image gets saved... which I've never found a work-around for that... but feel free to cherry-pick, if you wish, any changes... #4 here might be higher priority though. I've also just started developing for PaleMoon which neither of our extensions appear to work even with the <em:id> change in the latest PM... debugging time after I get used to PM... but that seems related to #9

Thanks for keeping up with this add-on for quite a long time. :)