manifest.json

{
  "manifest_version":2,
  "applications":{
    "gecko":{
      "id":"thunderbird_nord_theme@example.com",
      "strict_min_version":"60.0"
    }
  },
  "name":"Thunderbird Nord Theme",
  "description":"Nord colors",
  "version":"1.0",
  "theme":{
  	"images": {
		"theme_frame":"arch.png"
	},
	"colors":{
		"bookmark_text": "#000000",
		"frame": "#2E3440",
		"frame_inactive": "#2E3440",
		"popup": "#2E3440",
		"popup_text": "#D8DEE9",
		"popup_border": "#000000",
		"popup_highlight": "#000000",
		"popup_highlight_text": "#000000",
		"popup_border": "#000000",
		"sidebar": "#2E3440",
		"sidebar_text": "#D8DEE9",
		"sidebar_highlight": "#EBCB8B",
		"sidebar_highlight_text": "#2E3440",
		"sidebar_border": "#D8DEE9",
		"tab_text": "#EBCB8B",
		"tab_line": "#EBCB8B",
		"tab_loading": "#000000",
		"tab_background_text": "#EBCB8B",
		"toolbar_field": "#2E3440",
		"toolbar_field_text": "#D8DEE9",
		"toolbar_field_highlight": "#2E3440",
		"toolbar_field_highlight_text": "#D8DEE9",
		"toolbar_field_border": "#000000",
		"toolbar_field_border_focus": "#000000",
		"toolbar_field_focus": "#2E3440",
		"toolbar_field_text_focus": "#D8DEE9",
		"toolbar_top_separator": "#EBCB8B",
		"toolbar_bottom_separator": "#EBCB8B",
		"toolbar_vertical_separator": "#EBCB8B"
    }
  }
}