All the naysayers in these comments read like shills and if they aren't, they really should read how the tracking in question works. https://support.mozilla.org/en-US/kb/privacy-preserving-attribution?as=u&utm_source=inproduct

While it was kinda lame for Mozilla to add it with it already opted-in the way they did, they were still completely open about how it works from the start with a link right next to the feature in settings (the same link pasted above) and it's far less invasive than the other mainstream browsers.

It can be turned off too, easily. It requires unchecking a checkbox. No jumping through 10 different menus trying to figure out how to turn it off, like a certain other browser does with its monstrous tracking and data collection machine.

With ublock origin it's also moot, since ublock origin blocks all the ads anyways.

Call me a fanboy if you want, I wont care. Firefox is still the superior browser in my opinion.