Photo editing web tools perhaps very popular on internet recently but some of the online image editor require you to install the plugin or component before you can use their services. This may cause us less user friendly or troublesome.
Beside that, PXN8 also provide bookmarklet feature so all you have to do is click your PXN8 bookmarklet to grab images that you want to modify from a website.
Currently, The online photo editing is workable on Firefox, Safari and IE only.
PXN8 Web Image Editor Features