This incompatibility issue persists into Firefox 4 RC1 (No surprise).
It seems to me that it would be desirable to have this fixed before the
final release of Firefox 4, which is scheduled for 22 March 2011 (see
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Firefox extension doesn't work with FF4b10
Status in Zeitgeist Data-Sources:
When installed and up it shows alert box
and does so every time new window is opened.
Also previous FF4 betas were affected.
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