Examine source code of mm yomy

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "mm yomy",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(22, 22, 22)",
      "toolbar_text": "rgb(130, 112, 248)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(119, 64, 166)",
      "toolbar_field": "rgb(48, 48, 66)",
      "toolbar_field_text": "rgb(221, 180, 255)",
      "tab_line": "rgb(122, 33, 253)",
      "popup": "rgb(193, 193, 193)",
      "popup_text": "rgb(51, 26, 154)",
      "tab_loading": "rgb(122, 33, 253)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c5f06960-ce89-4542-a722-5dfb3d09c471}"
    }
  }
}