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Re:Firefox 5 is now officially released by fishtastic on Tuesday June 21, 2011 @01:47PM (#2679669)
I found a way to do this in XP. (Vista or 7 should be similar)

1. Open "Documents and Settings\<user name>\Application Data\Mozilla\Firefox\Profiles\<profile>\extensions

2. Find the folder for the unsupported extension, there should be a file called install.rdf inside.

3. Open the file and change the <em:maxVersion> to 5.*.

Might have missed something, but that did the trick for me.

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