Open IT Online is a Firefox extension that allows to open and edit your documents from everywhere.

When Firefox encounters one of the file types supported by Open IT Online, it shows the "Open With" dialog: if you have installed Open IT Online, you will get, among the others, an option to open the file online. Choosing this option, you will also have the possibility to choose which online service you want to use to open the file.

Open IT Online shows you also the file size of the document you could see online: this information helps you determining if you want to open the file online or not.

From v1.2, Open IT Online allows to edit also the images you find on the net, just right click on the image and choose the Open IT Online item from the context menu (see screenshot below).