Sunnats after Jumuah Salaah

Q: A recent WhatsApp message circulated by a Mufti has created some confusion regarding the status of the Sunnah Rakats after the Jumuah Salaat. According to the message, the four rakats after Jumuah are Muakkadah whilst the other two are Ghair Muakkadah. The question is that we were always taught and considered that there are 6 Rakats (4+2) of Sunnah Muakkadah. What is the status of the Sunnah Salaats after Jumuah Salaat?

Dying the hair black

Q: I am a twenty years old. Since January I have a disease. Now I am recovering. My question is that this disease has caused my hair to turn white before age. I know that it is haraam to pluck white hair and also that one falls in Allah's eyes by doing such deeds. But I have also heard that young muslims can even dye their hair black if they wish. I want to ask that is it permissible to pluck such white hair that are growing before age and are a result of a temporary disease?