Examine source code of Tweek Tweak

{
  "name": "Tweek Tweak",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Attachment-1-7.png"
    },
    "colors": {
      "frame": "rgba(162, 172, 235, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  }
}