Examine source code of Dim Theme

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Dim Rounded",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/addon/dim_rounded/",
  "description": "Dim-19 Theme for Firefox Quantum.",
  "icons": {
    "48": "icons/dim-19-48.png",
    "96": "icons/dim-19-96.png"
  },
  "theme": {
    "colors": {
      "toolbar": "rgb(56, 68, 77)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(21, 32, 43)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(21, 32, 43)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(93, 173, 236)",
      "popup": "rgb(93, 173, 236)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(93, 173, 236)"
    }
  }
}