Examine source code of Undesired-Effect

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "UNDESIRED",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(157, 177, 187)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(20, 251, 20)",
      "tab_background_text": "rgb(123, 127, 204)",
      "toolbar_field": "rgb(14, 201, 206)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(123, 127, 204)",
      "popup": "rgb(24, 231, 237)",
      "popup_text": "rgb(98, 102, 183)",
      "button_background_active": "rgb(32, 24, 70)",
      "sidebar_highlight": "rgb(28, 70, 24)",
      "tab_loading": "rgb(123, 127, 204)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4489c43c-b146-4ff6-a45e-b6c6d83244ac}"
    }
  }
}