I’m pretty sure that Chrome’s alternative is designed by Google to track you in a way that’s harder to block and gives them more control over the advertising market by forcing advertisers to play along and use their method instead of collecting your data directly. Sure, it’s more private, but it’s still tracking you.
Firefox, on the other hand, is focusing on completely blocking cross-site tracking. They have no incentive to completely block 3rd party cookies as long as there is also a legitimate use case for them, but I guess they will eventually also block them if Chrome is successful in forcing websites to stop relying on them for core functionality.
I don’t doubt the fact that they take some margin to extend the lifetime of the battery, but if we take iPhones as an example, they:
This makes me suspect that that the margin between what’s reported in software as 100% and the actual capacity of the battery is less than 20%. This also makes sense from the standpoint of the consumer expecting a long battery life on their expensive high-end device, putting pressure on the companies to make the margin smaller and the charging algorithms smarter. Just my observations, of course.