Examine source code of ffox Focus Gradient

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#8d3e92",
      "tab_background_text": "#404040"
    }
  },
  "version": "2.0",
  "name": "ffox Focus Gradient",
  "manifest_version": 2,
  "description": "All credit to /u/johnwick76 on reddit for the exact colors, I just threw them together in a photo editor for this purpose. Should work with android.\n\nFirst time making a theme may need to edit."
}