Third party developers are free to go here and see what Apple is doing:

https://github.com/WebKit/WebKit

> Most users wouldn’t even notice that their choice to use Safari is responsible for their great battery life.

Seeing that MacOS has called out which apps are using the most energy for years, users can definitely tell which apps are using the most battery life.

Apple can and does leave things out of that repo.

So you think there is a conspiracy by Apple to not allow third parties to be battery efficient and make there hardware look bad?

But you are free to download the source code, compile and run it yourself to see if it is less battery efficient than the official builds.

I absolutely think there is a conspiracy (inasmuch as "conspiracy" can be defined as "not going out of their way to change it") to make the competitors to Apple applications look worse than their own offerings. It does not reflect poorly on Apple when Firefox performs worse and uses more memory and battery than Safari.

How is Apple suppose to change Firefox and Chrome’s source code?

If either browser’s manufacturer wants to see what Apple does to make Safari more battery efficient, they are free to look at the source code to WebKit.

And as the other person told you already, Safari.app is not what you get if you build the WebKit source. In much the same way that you can't judge Chrome by Chromium, one is the base of the other, not the whole.

I did not say that.