Qutebrowser usage

Dark Mode

" enable chromium darkmode
:set colors.webpage.darkmode.enabled true

" new tabs default to a black background instead of white
:set colors.webpage.bg black

You can view the various available settings using

:set colors.<TAB>  " interactively test the settings you'd like

offline html viewer

disable javascript and network connections

qutebrowser \
  --temp-basedir \
  -s content.proxy http://localhost:666 \
  -s content.javascript.enabled false \
  file.html

or in mailcap

text/html; qutebrowser --temp-basedir -s content.proxy http://localhost:666 -s content.javascript.enabled false %s; needsterminal; nametemplate=%s.html