There's no commitment on Netscape's part to ship the work you do, nor would it be reasonable for them to make that commitment. We go thru this all the time. Developers, paid or not, make mistakes, or see things thru a narrower perspective than you can support. You have to read the code carefully before giving it to your users. I've learned this the hard way.
Software has to have goals.
And if Navigator fragments into fifteen incompatible browsers, they play right into Microsoft's strength. MSIE will become the market share leader, and content will be coded for their browser, not the various flavors of Navigator. Think it thru. Netscape has bitten off a huge political task. At age 42, I hear much of the philosophy of open source coming from people who are younger.