Examine source code of .300BLK

{
  "manifest_version": 2,
  "version": "1.0",
  "name": ".300BLK",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "right top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(45, 45, 45)",
      "toolbar_text": "rgb(242, 228, 207)",
      "frame": "rgb(63, 65, 66)",
      "tab_background_text": "rgb(242, 228, 207)",
      "toolbar_field": "rgb(61, 61, 61)",
      "toolbar_field_text": "rgb(228, 197, 151)",
      "tab_line": "rgb(159, 135, 179)",
      "popup": "rgb(93, 78, 106)",
      "popup_text": "rgb(242, 228, 207)",
      "button_background_active": "rgb(136, 147, 136)",
      "button_background_hover": "rgb(104, 96, 109)",
      "icons_attention": "rgb(176, 145, 98)",
      "icons": "rgb(228, 197, 151)",
      "ntp_background": "rgb(93, 78, 106)",
      "ntp_text": "rgb(228, 197, 151)",
      "popup_border": "rgb(148, 163, 148)",
      "sidebar_border": "rgb(159, 135, 179)",
      "sidebar_text": "rgb(228, 197, 151)",
      "tab_loading": "rgb(159, 135, 179)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7197b559-719a-4875-a5f2-94012877fca5}"
    }
  }
}