Its all very slick, until you try and install your favorite extensions that havent updated yet.

Heres how to force them to work.

Open up the about:config page, and then right-click anywhere and choose New > Boolean.

How To Bypass Firefox 4.0 Beta’s Incompatible Add-on Error and Install Extensions Anyway

At this point your extensions should install just fine…

The same goes for quite a few extensions that we tested, though some of them worked fine.

Were pretty sure theyll be updated very soon.

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