Examine source code of Simple Blue yellow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue yellow",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(8, 107, 174)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(50, 129, 183)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(230, 168, 3)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(25, 25, 25)",
      "popup": "rgb(50, 129, 183)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(241, 241, 4)",
      "button_background_hover": "rgb(11, 152, 248)",
      "icons_attention": "rgb(236, 41, 17)",
      "icons": "rgb(230, 168, 3)",
      "ntp_background": "rgb(8, 107, 174)",
      "ntp_text": "rgb(0, 0, 0)",
      "popup_border": "rgb(64, 64, 64)",
      "popup_highlight": "rgb(25, 25, 25)",
      "tab_background_separator": "rgb(11, 152, 248)",
      "tab_selected": "rgb(8, 107, 174)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(180, 134, 12)",
      "toolbar_field_border": "rgb(230, 168, 3)",
      "toolbar_field_focus": "rgb(230, 168, 3)",
      "toolbar_field_highlight": "rgba(74, 71, 71, 0.26)",
      "toolbar_field_separator": "rgba(74, 71, 71, 0.26)",
      "tab_loading": "rgb(25, 25, 25)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d671018c-578c-4d4e-bfa3-162e96b86a84}"
    }
  }
}