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Works in FF 4.0 Rated 5 out of 5 stars
Works great in Firefox 4.0.
To use this module in FF4.0, rename it as a .zip file (ie "openbook-188.8.131.52-fx.xpi" to "openbook-184.108.40.206-fx.zip"), extract and edit the file "install.rdf" as follows: locate the line "em:maxVersion="3.*" />" and change it as "em:maxVersion="4.*" />". Save, replace the original "install.rdf" file in the .zip archive, rename the .zip in .xpi and load it in FF4. Enjoy.