Since upgrading to Ubuntu 8.04 I am running Firefox in its latest version 3. At the beginning it was the beta 5, in between RC2 and now the final version. At the beginning I found some issues with some websites, for example the typo3 backend and simply ignored it and used Opera instead. But it seems there is more behind it than just initial hickups as I found more and more sites apparently incompatible to the new Javascript engine.

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