Google Docs Viewer v1.2.6resigned1
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If you prefer Microsoft Viewer use this add-on:
https://addons.mozilla.org/firefox/addon/online-docs-viewer/
To view pdf files with the Google Viewer use this add-on:
https://addons.mozilla.org/firefox/addon/google-pdf-viewer
My other add-ons:
https://addons.mozilla.org/firefox/addon/always-preview-webextension
https://addons.mozilla.org/firefox/addon/viewerjs-we
https://addons.mozilla.org/firefox/addon/docs-online-viewer-fork/