Examine source code of Zen Spring - Green

{
  "name": "Zen Spring - Green",
  "description": "Green version of the Zen Spring theme. This is a ported and updated version of the Zen Spring theme, originally only available for Google Chrome!",
  "manifest_version": 2,
  "version": "6.1resigned1",
  "author": "Nicholas Caito",
  "homepage_url": "https://xenomorph.net",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "zen.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ]
    },
    "colors": {
      "frame": "#9ea280",
      "tab_background_text": "#000000",
      "tab_selected": "#c5c7b3",
      "toolbar": "#c5c7b3"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a7c5dd9-7eaa-42f5-ae54-09e30f8999a9}"
    }
  }
}