I also would like to share my personal opinion on the matter.
First of all, I'm glad the CEO will change, it's clear that Baker didn't do that well, and her posts let me clearly understand what kind of person she is, not the right one to carry on Mozilla.
Second, I'm a "browser hopper". I've used all of them at some point. Chrome, Chromium, Vivaldi, Brave, Edge, Opera and some minor others. I'm now back to Firefox for the following reasons.
I identify as a power user, I daily drive Linux, I'm a developer, BUT... I'm not obsessed with security and privacy, in fact those aspects come at the very end of the list when judging a browser.
To me what matters the most is the ecosystem and simplicity.
1) Ecosystem: a browser for me must be something that I can use on any device and platform, Windows, Mac, Linux, Android. Interoperability is very important. The last browser I used was Vivaldi, but only recently it got history sync between device and even that was not enough as the sync rate is very limited, I often had to go into the browser's internals to manually force a sync update (even on Android!!!), Firefox updates much more frequently, much more fast and the process is more reliable. Not to mention that Vivaldi doesn't have a ARM64 release, which for me makes it unusable on my Android tablet, which I modded to dual boot Windows on ARM (it's actually pretty good for light work, heck I can run IntelliJ on it while traveling). Sorry to say this, but Vivaldi was absolute crap.
2) Simplicity: before Vivaldi I was using Firefox and before that Edge. When it first came out I was skeptical, wow yet another Internet Explorer I was thinking. But I did try it anyway because after all it was based on Chromium, how bad could it be.
My. God. I loved it, it was the best, super fast, super light, as soon as it came out on Linux I switched there too! Then Microsoft started acting like... Microsoft. Today that browser has been completely destroyed, full of crappy UI elements which I and no one else I can guarantee you gives an absolute shit about. Why Microsoft WHY?!
Similar story for Brave, full of crappy scam crypto-things, which yes can be disabled, but still very annoying.
3) Last point and probably the most important, Extensions: yep, to my knowledge Firefox is the only browser that meets the aforementioned requirements and also supports extensions. Thank you very much Firefox, just thank you!
Nowadays uBlock is mandatory, any browser on Android, even those with an "integrated ad-block" module sucks!
I laughed so hard at the recent Vivaldi changelog on Android that mentioned making the ad-block more powerful, but it actually was the same as before duh, again Vivaldi is crap. Like even browsers like UC Browser and the one integrated in the famous download manager 1DM+ are better at blocking ads and pop-ups hahahahaha.
So at the end of the day, that one and only choice I have is Firefox. And to be honest this scares me a bit. Considering how bad it's doing, if tomorrow it's going to disappear from existence I would be lost.
Another thing that worries me is that Mozilla seems to not listen to the user base. One thing that it's missing on Firefox is PWA support. If I'm not wrong it was removed for "security" reasons. Guys, the vast majority of users doesn't care about such meaningless things, their thinking is simple: can I use this PWA app with Firefox? No? Then I have no choice but to rely on Chrome.
There are a TON of comments on their forum asking them to bring the feature back, but as of today still no response. Here's the thread anyway: https://connect.mozilla.org/t5/ideas/bring-back-pwa-progressive-web-apps/idi-p/35
P.S: sorry for the long post