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You should always use the latest version of an add-on.
Version 5.5.5Released Feb 7, 2016 - 13.87 KBWorks with firefox 44.0a2 to 48.0[Changed]: Improved icon beside link
[Changed]: Using MS Office Online to view files replacing Google Docs Viewer as Google Docs Viewer is not supported any more.
Source code released under GNU General Public License, version 3.0