Attached in a ZIP file You may find 3 search plugins 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 creator of the original search plugin (initially on own OFBiz ML)