I've been using FF for more years than I care to remember, and with the exception of a couple of sites that weren't really that important, I've never had an issue. I certainly never had an issue running uBlock Origin and YouTube.
I flat out refuse to use anything even loosely based on Chromium on principal alone.
Has anyone been able to get Nvidia Reflex working under DX11 titles using DXVK? I can get it working under DX12 titles using VKD3D and Linux native titles, but I can't get it working under DX11 titles.
Connect the Steam Deck to a compatible dock and you can quite easily use it as a desktop. At the end of the day, it's still an x64 based PC that's just handheld.
One of the biggest problems regarding Nvidia drivers is the fact that a small minority install them using Nvidia's .run script, which overwrites important libraries, resulting in a wide range of issues. I've always installed Nvidia drivers using my distro's package manager and I've never had an issue.
Linux user here running FF, no real dealbreaker issues at my end.
I use Mozilla every single day and have done so for about 6 years now. Personally I don't feel like I'm missing out on anything but ads if I don't a Chromium based browser.
I've got plenty of old software here under Linux that still runs fine to this day across a number of PC's and even a Raspberry Pi that I use as a backup desktop. I honestly can't see backwards compatibility being any more of an issue than it is under Windows - There's a number of accounting packages released under Windows 7 that won't run under Windows 10, the latest version of most popular browsers won't run under Windows 7. Likewise, the latest version of MS Office 365 won't run under Windows 8.
My overview transition is seamless running X11.
RTX has worked under Linux both natively and via and Wine/Proton/DXVK/VKD3D for quite some time now.
I find the opposite running KDE Neon. In fact File Explorer 'lag' is a widely expressed issue regarding Windows 11.
Find a new job before those new owners take over the business.
Between two evils, Firefox is the comparative good guy. There's not a chance in hell I'm using anything based on Chromium, I've been using FF for close to two decades now and I've experienced very few dealbreaker issues.