On Fri, 19 Feb 2021 at 08:00, <peter@easthope.ca> wrote: > > In Debian 10, firefox-esr 78.5.0esr-1~deb10u1, what mechanism is > available to control rendering of a tab character? > > https://wiki.debian.org/Firefox doesn't mention "tab" or "css". Is > there a user editable css file for firefox? I used a search engine with keywords "html tab width render" and immediately found this: https://usefulangle.com/post/151/css-tab-size Does it help?