Initial revision came up

Version 1.0 uploaded, with basic functionality, allowing to open .doc and .xls by the Windows registered applications online.

Future developments will include:

Make plugin screen look better

Replace nasty text message with dialog resource like this:

|Logo| |Microsoft Office document is being opened.| |Content-Type:|application/msword| |File name:|test.docx| |online?|and open?| |x? Remember the choice and do not ask me anymore|
Develop an XPI Installer

Firefox installer to run on single click
Ability to view documents in-place

Preview screen in browser window
Register for all Office content-types

Make sure all documents are handled properly.
Develop dynamic configuration dialog

Configuration dialog to set file associations and actions for each of them.
Use browser download and authentication

As of right now WinInet? is used to download the file. It makes sense to use Firefox or Chrome to authenticate only once. This needs research though.