It doesn't look like you do.
Firefox has worked for me across 7 different employers in the last 15 years with no problems, and yet you haven't switched to it.
Actions speak louder than words. There is a viable alternative. You aren't using it.
On desktop (multiple Linuxes, Windows 7 and 10, and MacOS) I run into problems which I spend hours trying to fix, until I give up and go back to a Chromium browser. On iPadOS and iOS, it would crash when using arrowkeys to navigate URL history(or something like that, if I remember correctly. Been awhile). I had another issue with it on Android, the details of which I'd forgotten. I don't even use the sync features- these are just independent bugs.
Every time I tried to switch to Firefox, it's a time sink that ends with a broken install. I used Firefox as my primary browser in the early 00s through to ~2010. I tried to switch back every few years between 2017 and 2023.
The recent bad new changes (forced built-in advertising, new worse ToS, forced AI stuff) make me uninterested in spending more time on Firefox. I'm happy it works for you, but we are not the same person, and Firefox is entirely nonviable for me.
And yet I, and a few hundreds of thousands of others, have used it on all of those platforms. Even at FAANGs.
If it's only breaking for you, and you alone, you can see why the rest of us are skeptical that it really is that broken.
I myself am guilty of this in the past, and I hope GP does not take offense at my writing this, as I don't intend to offend. I think it's just a feature/bug of humanity... some underlying mechanism that can possibly only be explained with psychology of lizard brains or something ;)
There are several problems here.
Before anything, I want to note that we don't have to fight, we aren't enemies. We're on the same ideological side, even. This tastes like an angry and bitter internet argument. Do you taste it too?
We're just two people talking about web browsers. We don't need acrimony for each other. My bitterness is for the browser ecosystem. I am very sad about the browser ecosystem.
On that note, who are you speaking for, other than yourself, when you talk about "the rest of us"?
You are only you, and I am only me. The difference here is that you have good experiences with Firefox, and I have had bad experiences with Firefox.
Second, your skepticism is part of the problem with Firefox. In trying to find support for these issues, I mostly found people who did not believe me (or that I'm using it wrong, etc.)
The way you engage with people is common in the Firefox community, which is deleterious to the goal of having more people use Firefox. I think it's actually really important that we have a good non-Chromium non-corporate browser which people want to use, and Firefox is still the most promising one in the running.
Third, it's just incorrect to think I am alone in my issues. Some of these issues I could confirm were unfixed bugs, by finding them in the issue trackers. Others I could find with my issues in threads on Reddit, for example. Others are in this same thread we're commenting on. You can see people here talking about issues with Firefox, or needing to "Frankenstein" their install to get it to a usable state (a relatable experience for me, except I couldn't get it back into a usable state. I never want to touch user.js again.) My experience is lonely, but I am not the only person with my experience.
There is also the 94% to 98% of people on the internet who do not use Firefox. Some of those must be because they wanted to use Firefox, but had a breaking issue and went to Chrome.
People use software with bugs all the time, and Chromium and Safari's dominance is mostly because of years of costly domination from Apple and especially Google. But part of it is also things simply not working in Firefox. (Which is, also, partially due to Google expanding on Microsoft's IE-era standards playbook).
Finally, what is your position exactly? That Firefox can't possibly have the bugs I had? Or that I am lying about wanting a viable non-Chromium browser? I think you might be responding with a knee-jerk defense of Firefox, and you might assume I'm arguing in bad faith, which is fair, given this is the "Forum for Bad Faith Arguments About Computers with Some Amount of Financially-Motivated Arguments".
But I am ideologically motivated to be on Firefox's side. It's the largest browser engine not owned by a FAANG. Ideological motivation is the reason why I tried to use Firefox several times over several years, and why I spend time talking on the internet with strangers about web browsers.