Examine source code of BlackBeast

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "BlackBeast",
  "manifest_version": 2,
  "description": "Since i wanted a theme for browsing web on night, without hurting my eyes. Although there are other themes that are black and dark i just wanted a theme that are completely black even the tab bar without any whity bar."
}