The fact that the developer isn't aware that WebRTC is Web Real-Time Communication and not Chat is worrying. The WebRTC protocol can be used for a whole lot of stuff other than real time video chat, so if they're disabling it then that's a shame for their users. For one, you can use it to transfer files between two users without having to upload to a server in the middle - that's a privacy plus, not a threat.

It's worth noting that Pale Moon is actually slower than Firefox stable: http://portableapps.com/node/39509

It's also incompatible with many extensions.

Not to mention it adds another party you have to trust not to insert unwanted/malicious code into your browser.

When I get binaries from Mozilla, I only have to trust Mozilla. When I get binaries from my distro's repositories, I only have to trust Mozilla and my distro's maintainers. Both of those are entities I know and trust already, so I'm comfortable with that. But I don't know anything about Pale Moon.

My favourite ever comment about Pale Moon, for which I unfortunately can't remember the original source, is that it is "snake oil for users who are convinced that compiling with -O666 -funroll-all-loops will give them a better browser".