The issues with Palemoon is the UA (user agent) It's the damn websites that seem to want a UA from Firefox, Chrome or Safari. Check out the addon UAControl and add this line:
Code:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_1) AppleWebKit/601.2.4 (KHTML, like Gecko) Version/9.0.1 Safari/601.2.4
That will also fix the F-up that is Google in their infinite wisdom to mess up YouTube with a UA.
This isn't a PM problem, it's a website problem.
Been using PM for over 4 years. I've had few issues and if I do I chime in on the PM forum.