[_delirium]

Some do, but they have them Mozilla-approved. Vendor-specific patches are allowed in a product called "Firefox", if Mozilla approves the patches before release. I believe Red Hat is one vendor that does that. Debian won't agree to include a package that needs third-party approval of modifications, though.

[Xylakant]

I'm sorry about the miswording - I meant "unoffical" as in "not officially approved". Thanks for the correction.