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Namely, is there some equivalent extension around that runs in FF4, or is there some way to alter oldbar?

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up vote 0 down vote accepted

Moot. The newest version does run in FF4.

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If it ever doesn't, then look for checkCompatibility and checkUpdateSecurity settings online.

Here is what I've added to my about:config because I've a nightly build for optimization purposes...

enter image description here

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