Urdu font is broken firefox (version 80) ubuntu 20.04
Urdu words are broken on `Firefox` (`version 80`) and `ubuntu 20.04` on Facebook and main search window (They are alright in wikipedia). Chromium and Chrome are rendering them properly.
I changed the font settings in firefox and selected the same fonts as they were in Chrome but it didn't solved my issue. I've also installed and used Nafees font package as indicated [here](https://askubuntu.com/a/542683/864585). It corrected the shape of characters but words are still broken. Similar [thread](https://forums.linuxmint.com/viewtopic.php?t=222388) on `linuxmint` forum provided an answer. It uses same fonts as that of chromium but there's an extra option of `"Text encoding for legacy content"` and uses Arabic in that. I can't find this option in my version of mozilla (I'm attaching picture of option available in my mozilla?
Can someone please suggest a solution or can help me to find the option `"Text encoding for legacy content"`.