We don't support any longer Nabble or MarkMail search plugins. To create your own Firefox search plugins use the"Add to Search Bar" Firefox addon
For history you may look at
http://lists.ofbiz.org/mailman/listinfo
history of users is here for example http://lists.ofbiz.org/pipermail/users/
There is no embedded search tool but you may use google site search option
Attached in a ZIP file You may find 3 searchplugins respectively for All OFBiz ML List (User+Dev+Annonce), User ML and
Dev ML. I used Nabble for that. I don't know how far is the history but it works anyway.
To use it unzip files and put them in your Firefox's searchplugins dir.
For me on Windows it was : C:\Program Files\Mozilla Firefox\searchplugins, on Linux (Ubuntu 5.1) /usr/lib/mozilla-firefox/searchplugins
Thanks to Firas A. who was the original creator of this searchplugin (initially on own OFBiz ML)