Examine source code of I know a Hacker

{
  "name": "I know a Hacker",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "TechStasshBuilds (5).png"
    },
    "colors": {
      "frame": "rgba(29, 156, 15, 1)",
      "tab_background_text": "rgba(51, 158, 101, 1)",
      "toolbar": "rgba(75, 179, 74, 0.58)",
      "bookmark_text": "rgba(69, 224, 80, 1)",
      "toolbar_field": "rgba(17, 26, 16, 1)",
      "toolbar_field_text": "rgba(47, 204, 63, 1)",
      "tab_line": "rgba(40, 135, 77, 0.54)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fb6ad724-2e65-483d-8b5b-f27f76e46d5e}"
    }
  }
}