Examine source code of Dark lite II

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark lite II",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-017-7074520d97b5c592d413aed5f115f093.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(50, 51, 53)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(80, 91, 81)",
      "tab_background_text": "rgb(253, 253, 234)",
      "toolbar_field": "rgb(70, 67, 55)",
      "toolbar_field_text": "rgb(233, 231, 237)",
      "tab_line": "rgb(74, 102, 104)",
      "popup": "rgb(251, 251, 251)",
      "popup_text": "rgb(30, 44, 28)",
      "button_background_active": "rgba(75, 52, 97, 0.81)",
      "icons": "rgba(69, 255, 242, 0.81)",
      "popup_border": "rgb(63, 79, 98)",
      "popup_highlight_text": "rgb(23, 31, 40)",
      "tab_loading": "rgb(74, 102, 104)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{32f73b4f-d862-477a-b61f-695ee27c8742}"
    }
  }
}