Examine source code of Subtle Rise

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#c9c3c3",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Subtle Rise",
  "manifest_version": 2,
  "description": "A persona with a gradient that incorporates 3 different colors, bringing them together with a subtle yet pleasing finish. Created by unJames"
}