- Hotkeys - very handy ones
- fullsizing image to its original size when opened, nothing else than image
- autofit to screen big images by default (larger than screen both vertically and horizontally)
- address of page doesn't change so you still can copy\share it
- image centering (like in firefox) - pretty usefull on wide monitors
- configurable - choose background color and what images to fit to screen when opened, or run your js
- fast - does its job before page loads its resources (or run JavaScripts in FireFox)
- fail-safe - if it didn't find image to fullsize - it won't do anything to mess the page up and will try again in few sec.
- WASD \ arrows \ num4862 - scroll image to right\left\top\bottom accordingly
- Q \ num5 \ click on image - resize image from full-window-size to original and vica versa
- ctrl+space and ctrl+shift+space - simular to scroll of spacebar but horizontally
- P \ menu item in (tamper\grease)monkey icon - open configuration menu
- R - reload page with script disabled (to see comments etc)
In the topic title, write "fix" if the site is already on the list or "add" if it is a new request, and the domain (eg: add googleimagehost.com)
* But keep in mind that when requesting nameless non-popular image hosting google knows not much about you'd have to provide a reason for adding it - a website url which uses that hosting a lot for images
** Or if you are a developer yourself and would like to help add new hosts, you can submit code edits at GitHub page
https://github.com/Owyn/HandyImage/blob/master/supported-host-list.txt