[dathinab]

> as you might expect, Mozilla does not care

internal options are internal options, no browser cares much about them outside of e.g. some huge company support contracts

if you have to go to `about:config` for anything but dev or MDA related things then you can't expect things to continue working with any update

and every option is code which needs to be maintained

if I should guess they rewrote the code which used the option and did the faster/cheaper thing of not re-implementing a feature they officially anyway don't support