Open IT Online, an add-on for Firefox, delivers you what you want.  Well, it delivers you what you want, if you are one of those people who love all these new Online services such as Zoho’s office applications or Google Docs.  Open IT Online allows you to open your documents and images online without the need of any software to be installed.

Here are some of the extension types it can recognize and handle:

• Documents (*.doc, *.rtf, *.odt, *.sxw)
• Spreadsheets (*.xls, *.csv, *.ods, *.sxc)
• Presentations (*.ppt, *.pps, *.odp, *.sxi)
• Images (*.jpg, *.gif, *.png)

How do you use it?  Well whenever you face a document with the “Open With” option, it will also give you the option to open it Online.  From there you can choose one of the various Web 2.0 tools to view and edit the document in question.

One last really nice feature is that Open IT Online gives you the ability to also see the file size of the document you are about to view.  This is handy in determining if you want to open the file, or not.

You can pick up the Open IT Online extension from the Firefox Add-ons site or learn more about it at OpenItOnline.com.