A good point. If the FF engine is so slow it needs this, then the engine needs help.

However I see no reason why you should not be able to indicate to firefox that for this page do not optimize the javascript, then vuala good debugging. The only catch is that the optimizations need to be proven to be correct in all cases.

Once we have Safari for Linux I will consider using it as the main browser...

Scratch that, once at work we officially support it ill consider it :)