If you're looking for tenfourfox.plugins.enabled, the last version of TenFourFox to support that was 17.0.11. Because of changes in Mozilla's plugin architecture, there is no way to reenable old PowerPC-compatible plugins in TenFourFox 19 and later, so this is no longer possible.
You might have some luck with SandboxSafari but you're on your own with that.
flash player and silverlight don't work with a power pc G5, so HULU don't work because it needs flash player and Netflix don't work because it needs silverlight, i was sure it did before but netflix and hulu must have changed it, youtube videos work great but thats it, if the power pc don't have these it kind of makes the whole computer go down hill pretty fast, i with the ten4fox people would get these two working for their browser, that would be a big thing that it really needs
Tony, please read the comments by Cameron Kaiser (above). You can try Safari or TenFourFox 17, but the PPC plugins available (Flash 10.2 and Silverlight 1 (?)) will likely be too old for Netflix/Hulu anyway nowadays. These plugins will never be updated again for PPC by Adobe and Microsoft. If you depend on Netflix, a PPC Mac isn't the right option for you.