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I've tried, but it doesn't have support for FF 3.6.7. Looking for an extension that is os-independent

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You can try the oxymoronical addon by doing the following -

1. download the xpi 
2. change the extension to zip
3. extract the install.rdf
4. change em:maxVersion value to 4.0.*
5. replace the install.rdf in the zip with the one you just edited.
6. change the extension of the download back to xpi
7. open in firefox.
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Or you could just use Nightly Tester Tools ( ) to override the version check. – Matthieu Cartier Dec 25 '10 at 7:12

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