I have done exactly that... except it doesn’t work in Firefox, as you mentioned. There Ctrl-w always closes tabs, except in pinned tabs when it jumps to another

I have done exactly that... except it doesn’t work in Firefox, as you mentioned. There Ctrl-w always closes tabs, except in pinned tabs when it jumps to another tab without closing. It does work as expected in Chrom(e|ium) and most other apps. In Chrome you can still close tabs with ctrl-w, you just have tab out of a text box first.