I trust Mozilla enough to continue using Firefox, and there is the fact that nonprofit organizations are very limited with what they can do regarding profit. That being said, I can see many of you guys' very valid points. Like the one about Mozilla and the opt-out features instead of being opt-in. Yet, for me, Firefox-esr on Debian mitigates much of the problems with Firefox (i.e you aren't allowed to opt-in for studies and telemetry). I remember switching from Chrome though, and the customize-ability and Freedom of Firefox is like a breath of fresh air. I reckon many of you old FOSS advocates never switched because you always used Firefox... And comparing the two - Mozilla vs Google and Firefox vs Chrome - Mozilla is already very open about what they do. Heck I still find myself using Chromium-based browsers for school and I hate the lack of options for settings customization and especially the lack of privacy settings.
PS something that made me laugh so much was when I contacted HP support for my printer (Isn't it nice that you don't need to mess with support when it comes to FOSS software...). Luckily I had the foresight to use Windows for this endeavor (I have a Windows partition for DRM controlled media and also to play with the ultimately useless WSL among other reasons that make Windows a toy). So anyway, she sent me this little applet to allow her to remotely control my pc. I didn't like it, but I thought hey, as long as she doesn't mess with my Linux partition, it will be fine. The first thing that idiot woman did was search for Chrome using the Cortana-less search bar and then look for it in the start menu. It was so funny watching her poke around my system looking for Chrome for about 3 minutes before she gave up and opened Edge... like wtf. A perfectly good Firefox is already opened. I closed Edge and showed her that I already had the website opened in Firefox.
PPS. I found it very interesting that the default settings for Firefox when I downloaded it for Windows were worse than they were for Firefox on Linux. For one, DRM was enabled by default among a bunch of other things. So they do have a lot more opt-in options for those of us on Linux.