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Seems to have stopped working. Firefox says the host site's security certificate is out of date so it won't log on to get data.
5 stars again after this is fixed.
Worked easily after downloading. Still short on definitions or the expansions for many acronyms, but allows for the expansions to be added when not found. Works well, in that you do not have to go and run a separate search to look up and research the acronym.