igorlogius thank you for replying to my concern about the change from an options tab to choose between PNG and JPG as well as max page px height. As you recommended I downgraded to v1.4.7 and disabled updates for this add-on. I should mention I found no delay when saving long webpages as PNG vs JPG.

In the interim I did use the default Firefox Take Screenshot which saves as PNG but it requires right click then press "t" then choose full page download which I found difficult to map to a mouse key which is what I did with your add-on.

I hope you will reconsider reinstating the options tab for your add-on.

The simplicity and speed of your add-on is what made me choose it. :-)