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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?

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up vote 5 down vote accepted

Nobody knows.

  1. Google doesn't know. There is a pretty good article about the previous version on ProcessList.

    But the current version? No details. This page is #5 on the results!

  2. Microsoft doesn't know. Use the inline "Bing" interface at

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.

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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.

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Under which circumstances does that happen? I activated the plugin and tried it... it just doesn't do what you describe, I always get the download dialog -- even if the server does everything correctly (Content-Type "application/vnd.openxmlformats-officedocument.wordprocessingml.document" and no "Content-Disposition: attachment"). – Heinzi Oct 18 '09 at 11:20
@Heinzi: just a hint: go to about:plugins page in Firefox and you can see the MIME types the plugin is supposed to handle. – Amro Mar 2 '12 at 11:17
@Amro: Thanks, good idea. Apparently, this plugin only handles application/x-msoffice12. No idea what kind of file that would be... – Heinzi Mar 11 '12 at 22:32

This plugin should allow you to view, alter, and save excel workbooks online (such as spreadsheets hosted on

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protected by slhck Oct 24 '12 at 14:13

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