Examine source code of Poem

{
  "name": "Poem",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "poem-2.png"
    },
    "colors": {
      "frame": "rgba(232, 233, 235, 0.73)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(166, 166, 166, 0.76)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(43, 82, 68, 0.66)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(67, 49, 230, 0.77)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1795fa29-228e-4540-b05d-a6f7fb95f85e}"
    }
  }
}