Examine source code of Ellen Joe theme

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Ellen Joe theme",
  "author": "k1gs",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "/images/0.png"
      ]
    },
    "colors": {
      "toolbar": "rgba(20, 20, 25, 0.5)",
      "toolbar_text": "#ffffff",
      "frame": "#0a0a0f",
      "tab_background_text": "#b4b4b4",
      "toolbar_field": "rgba(255, 77, 109, 0.5)",
      "toolbar_field_text": "#ffffff",
      "tab_line": "#ff4d6d",
      "popup": "rgba(201, 24, 74, 0.6)",
      "popup_text": "#ffffff",
      "popup_highlight": "rgba(255, 117, 143, 0.5)",
      "popup_highlight_text": "#000000"
    },
    "browser_specific_settings": {
      "gecko": {
        "id": "ellen-joe-shark-theme@k1gss"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5a388985-4bfb-4040-bd7d-ecd9492c8d17}"
    }
  }
}