Comment 20 for bug 1971608

Hello,
i made some screenshot,
please see the difference (in readability)

with setting "0" (user-set)
https://ibb.co/d7PnX0f
https://ibb.co/0pNdLxL
https://ibb.co/SQKxVLk

with setting "1" (standard, firefox 91.5 esr, 64bit, ubuntu 18.04 LTS)
https://ibb.co/z7617DY
https://ibb.co/FVnZZDQ
https://ibb.co/NKkMmVw

Thanks.