He got kicked out of Mozilla for homophobia.
It's actually 4%, see https://radar.cloudflare.com; websites like statscounter are not accurate because they rely on trackers blocked by Firefox enhanced tracking protection.
It genuinely sucks that some websites don't bother to support Firefox! When you encounter one, you might want to complain to the devs and open a webcompat issue.
Unless you were running Firefx with outdated uBO filters, I doubt that. Vivaldi is a memory hog for me.
DuckDuckGo has great results IMO
Qutebrowser is chromium-based, and barely anyone uses icecat since the modern web heavily relies on JS, iceraven is a Firefox for Android fork, which could maybe have like 50 users and librewolf is unusable for daily usage because of RFP (resist fingerprinting worsens a lot of sites that rely on canvas). (This is just my opinion)
They're usually very inefficient energetically though
Soy milk my beloved
Public transport for the win :D
They didn't say any software that doesn't have telemetry isn't any good.