People need to be aware that the default browser is optional, and it's a dark pattern not to alert them to this. Having just reset the phone, I went through the Hello process. It's the only way, apparently, to fix "system memory" taking up the entire amount of free memory. Worked for me.
I wish it would be a lot easier to disable JavaScript on demand, but I just installed Sheriff (free, no payola for me) and will try. Disables JavaScript (and cookies) on a per-site basis.
I wonder how many users even know about the "spacebar trackpad".