First of all, it works! Rated 5 out of 5 stars

There are several addons that say, that they shrink images, but this happens only in words and not de-facto.
This one does what it says and this is fully enough for 5 stars.
Regarding additional toolbar on working area - it is indeed a little big.
But I have one proposal - to make it hovered: when the addon is switched on - it appears on few seconds and dissapears.
But it is enough to remember its position.
When user brings cursor to this area - the toolbar appears and user can click on its buttons/icons.