So what? That doesn't mean they are obliged to comply with whatever you think is "the right thing"®.
I'm gonna highlight another another big difference that you seemed to overlook.
Microsoft is a company, their mission is to generate profits for their shareholders and they are the owners of Windows 10, because they developed it. Mozilla is a non-profit corporation whose main product, Firefox, is software that has been developed and tested (to a big extent) by people who do not get paid a single cent, because they have faith in the project and the overall mission that Mozilla attempts to portrait.
Now, I really want to understand your side, please explain, how come what Microsoft did with Windows was wrong but what Mozilla did with Firefox was ok?
Edit: Downvotes, but no arguments, as expected.