vomnibar: give font-family explicitly with "!important"
vomnibar: give font-family explicitly with "!important"

fix a font issue caused by:
  https://msdn.microsoft.com/zh-cn/library/hh439680(v=vs.85).aspx

gdh1995/vimium-plus,gdh1995/vimium-plus,gdh1995/vimium-plus