After installing Office 2007, the following plugin shows up in Firefox:
2007 Microsoft Office system 12.0.4518.1014
Office Plugin for Netscape Navigator
What exactly does it do?
At some point in the future, I would expect the Mozilla Plugin Checker will at least display the current version, but I think that is all you can determine for now, without calling Microsoft and getting the paid-for-support answer.
That plugin should allow you to open Microsoft Office documents in Firefox (when you click on a link), rather than having to download the file and then open the file in the proper program.
This plugin should allow you to view, alter, and save excel workbooks online (such as spreadsheets hosted on docs.google.com)
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