Examine source code of Almost Black

{
  "name": "Almost Black",
  "manifest_version": 2,
  "version": "1.2resigned1",
  "theme": {
    "colors": {
      "frame": "rgba(16, 25, 33, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "tab_selected": "rgba(76, 85, 93, 1)",
      "tab_line": "rgba(76, 85, 93, 1)",
      "tab_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(242, 242, 242, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7245c3aa-1697-49ff-91e2-0ecd63f9c35e}"
    }
  }
}