Npsoplugin

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npsoplugin is a NPAPI⁠ library that allows to render LibreOffice documents directly in a browser. The plugin will be removed in LibreOffice 4.4 (see release notes and this blog)

With “Enable NPP_Initialize/Shutdown again” fixed on recent LibreOffice master towards LibreOffice 4.0, what works for me against a firefox-16.0.2-1.fc17.x86_64 is:

Create a symlink ln -s .../program/libnpsoplugin.so ~/.mozilla/plugins/ (or let LibreOffice do that for you via “Tools - Options... - Internet - Browser Plug-in - Display documents in the browser”)
sudo setenforce Permissive (instead of “Enforcing”) to prevent /usr/lib64/xulrunner/plugin-container from failing to mmap libnpsoplugin.so as PROT_READ|PROT_EXEC with EACCES.
Run firefox and open some URL pointing at a .odt file; soffice should start in the background and the document display in the browser window.

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