Examine source code of Dub vision

{
  "theme": {
    "images": {
      "theme_frame": "Header-s3anist.jpg"
    },
    "colors": {
      "frame": "#a3a3a3",
      "tab_background_text": "#edc513"
    }
  },
  "version": "2.0",
  "name": "Dub vision",
  "manifest_version": 2,
  "description": "Cutsom size - Best used for people with 1920 display, and for users with no bookmarks toolbar or additional tool bars... \n\nEnjoy!"
}