Ubuntu Dark Themes Fixs For Mozilla Firefox

Here is a userstyle for Stylish that implements the CSS fix.

Install both of it.

Open Firefox --> Tools ---> Adds-on  ---> User Styles ----> High Contrast Inverse Google Fix  ----> Edit

Replace  content
@-moz-document domain(google.com)
{ input { -moz-appearance: none !important; color: #000000 !important; } }

with this

input[type="text"],
input[type="password"],
textarea
{
  -moz-appearance: none !important;
  background: white;
  color: black;

  border-radius: 5px;
  border: 1px solid #BBB;
  background-color: white;
  padding: 3px;
  color: black;
}

Save.

Enjoy the new look.

source