Examine source code of Gray Dark Theme

{
  "manifest_version": 2,

  "applications": {
    "gecko": {
      "id": "gray-dark-theme@mnp",
      "strict_min_version": "58.0"
    }
  },

  "name": "Gray Dark Theme",
  "version": "1.5",
  "description": "Gray Dark Theme For Firefox",

  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },

  "theme": {
    "colors": {
        "frame": "#31363b",
        "tab_background_text": "#00BFFF",
        "toolbar": "#3b3b3b",
        "toolbar_field_text": "#00BFFF",
        "toolbar_field": "#252525",
        "popup": "#3b3b3b",
        "popup_text": "#0ab5ff",
        "popup_border": "#000000",
		
            "button_background_hover": "rgba(140, 140, 140, 0.5)",
            "button_background_active": "#757575",		
        
        //Imported from dark
        "icons": "rgb(249, 249, 250, 0.7)", //"icons": "#EAEAEB",
        "tab_line": "#0a84ff",
        "toolbar_field_separator": "#5F6670",
        "toolbar_bottom_separator": "hsl(240, 5%, 5%)", 
        "toolbar_field_border": "rgba(85, 85, 85, 0.7)",
        "sidebar": "#38383D",
        "sidebar_text": "rgb(0, 191, 255)",
        "ntp_background": "#5c5c5c",   
        "ntp_text": "rgb(0, 191, 255)" 
    }
  }
}