Examine source code of Brisk Brown

{
  "theme": {
    "images": {
      "theme_frame": "top.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Brisk Brown",
  "manifest_version": 2,
  "description": "Brisk Brown is a light brown Persona for Firefox. It has a nice gradient with light stripes to give it that extra \"Pop\"."
}