Wiredfire@neil @waltertross @suetanvil I’d also say general poorer performance and resource usage are key factors. Most users just want something that works and works well. Chromium-based browsers have Firefox well beaten for resource usage (especially Edge) and for overall speed. Firefox “feels” just a little clunky around the edges and (not saying this is right) that is enough to put many off.
Chris [list of emoji]My own take on this is that browsers have expanded into (intrinsically inefficient) application runtimes with no real way to make a distinction between "client app" and "just a document".
Both of these have value, but it leads to installing a Linux-kernel-sized application each time you want to read a 300-word article.
(IMO, we need a Web Without Scripting to go with the existing web.)