All of that is frequently married with an the amount of vitriol that seems out of place and downright bizarre. There is typically a lack of constructive discourse or suggestions, beyond vague hand-waving about how they should "just do better", or "just do this or that". Well, if it's that easy then why don't you start a browser?
In-between all of that there is the inevitable political vitriol and flaming about Mozilla. Have we gotten a flamewar about Brendan Eich (who left over 11 years ago) yet? It's the Godwin Law of Mozilla/Firefox.
These threads bring out the absolute worst of the site and many people with more nuanced views probably make a habit of staying out of them. When I've commented on this before I've been accosted with highly aggressive personal attacks. So now I often just hide them.