Inbound Data Filters - legacy browsers not working

I have turned on Filter out known errors from legacy browsers in Inbound Data Filters but still have errors like Exception... "Not enough arguments" (NS_ERROR_XPC_NOT_ENOUGH_ARGS)" from Firefox 4.0

So the code for the legacy browser filters lives here
but the tl;dr is that we don’t specify any old versions of Firefox to be filtered out.

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