ਅਗ 28, 2019 ਤੇ Jarek Bialkowski (Developer) ਵੱਲੋਂ · ਪਰਮਾਲਿੰਕ

Hi. Unfortunately it will not be easy if possible at all :(. Mozilla has changed theme handling completely. Now themes has to be provided as WebExtensions packages and AFAIK at least for now they lacks of necessary features. I'll try to take a look on it when I find some time.