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Showing content from https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme below:

theme - Mozilla | MDN

theme Type Object Mandatory No Manifest version 2 or higher Example

"theme": {
  "images": {
    "theme_frame": "images/sun.jpg"
  },
  "colors": {
    "frame": "#CF723F",
    "tab_background_text": "#000"
  }
}

Use the theme key to define a static theme to apply to Firefox.

Note: If you want to include a theme with an extension, please see the theme API.

Note: Since May 2019, themes need to be signed to be installed (Firefox bug 1545109). See Signing and distributing your add-on for more details.

Note: A new version of Firefox for Android, based on GeckoView, is under development. A pre-release version is available. The pre-release version does not support themes.

Image formats

The following image formats are supported in all theme image properties:

JPEG
PNG
APNG
SVG (animated SVG is supported from Firefox 59)
GIF (animated GIF isn't supported)

Syntax

The theme key is an object that takes the following properties:

Name Type Description images Object

Optional as of Firefox 60. Mandatory before Firefox 60.

A JSON object whose properties represent the images to display in various parts of the browser. See images for details on the properties that this object can contain.

colors Object

Mandatory.

A JSON object whose properties represent the colors of various parts of the browser. See colors for details on the properties that this object can contain.

properties Object

Optional

This object has properties that affect how the "additional_backgrounds" images are displayed and color schemes are applied. See properties for details on the properties that this object can contain.

images

All URLs are relative to the manifest.json file and cannot reference an external URL.

Images should be 200 pixels high to ensure they always fill the header space vertically.

Name Type Description theme_frame String

The URL of a foreground image to be added to the header area and anchored to the upper right corner of the header area.

Note: Chrome anchors the image to the top left of the header and if the image doesn't fill the header area tile the image.

Optional in desktop Firefox 60 onwards. Required in Firefox for Android.

additional_backgrounds Array of String

Warning: The additional_backgrounds property is experimental. It is currently accepted in release versions of Firefox, but its behavior is subject to change. It is not supported in Firefox for Android.

An array of URLs for additional background images to be added to the header area and displayed behind the "theme_frame": image. These images layer the first image in the array on top, the last image in the array at the bottom.

Optional.

By default all images are anchored to the upper right corner of the header area, but their alignment and repeat behavior can be controlled by properties of "properties":.

colors

These properties define the colors used for different parts of the browser. They are all optional. How these properties affect the Firefox UI is shown here:

Note: Where a component is affected by multiple color properties, the properties are listed in order of precedence.

All these properties can be specified as either a string containing any valid CSS color string (including hexadecimal), or an RGB array, such as "tab_background_text": [ 107 , 99 , 23 ].

Note: In Chrome, colors may only be specified as RGB arrays.

In Firefox for Android colors can be specified using:

full hexadecimal notation, that is #RRGGBB only. alpha and shortened syntax, as in #RGB[A], are not supported.
Functional notation (RGB arrays) for themes targeting Firefox 68.2 or later.

Colors for Firefox for Android themes cannot be specified using color names.

Name Description bookmark_text

The color of text and icons in the bookmark and find bars. Also, if tab_text isn't defined it sets the color of the active tab text and if icons isn't defined the color of the toolbar icons. Provided as Chrome compatible alias for toolbar_text.

Note: Ensure any color used contrasts well with those used in frame and frame_inactive or toolbar if you're using that property.

Where icons isn't defined, also ensure good contrast with button_background_active and button_background_hover.

See example

"theme": {
  "colors": {
    "frame": "black",
    "tab_background_text": "white",
    "tab_text": "white",
    "toolbar": "black",
    "bookmark_text": "red"
  }
}

button_background_active

The color of the background of the pressed toolbar buttons.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "button_background_active": "red"
  }
}

button_background_hover

The color of the background of the toolbar buttons on hover.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "button_background_hover": "red"
  }
}

icons

The color of toolbar icons, excluding those in the find toolbar.

Note: Ensure the color used contrasts well with those used in frame, frame_inactive, button_background_active, and button_background_hover.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "icons": "red"
  }
}

icons_attention

The color of toolbar icons in attention state such as the starred bookmark icon or finished download icon.

Note: Ensure the color used contrasts well with those used in frame, frame_inactive, button_background_active, and button_background_hover.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "icons_attention": "red"
  }
}

frame

The color of the header area background, displayed in the part of the header not covered or visible through the images specified in "theme_frame" and "additional_backgrounds".

See example

"theme": {
  "colors": {
     "frame": "red",
     "tab_background_text": "white"
  }
}

frame_inactive

The color of the header area background when the browser window is inactive, displayed in the part of the header not covered or visible through the images specified in "theme_frame" and "additional_backgrounds".

See example

"theme": {
  "colors": {
     "frame": "red",
     "frame_inactive": "gray",
     "tab_text": "white"
  }
}

ntp_background

The new tab page background color.

See example

"theme": {
  "colors": {
     "ntp_background": "red"
  }
}

ntp_card_background

The new tab page card background color.

See example

"theme": {
  "colors": {
     "ntp_card_background": "red"
  }
}

ntp_text

The new tab page text color.

Note: Ensure the color used contrasts well with that used in ntp_background and ntp_card_background.

See example

"theme": {
  "colors": {
     "ntp_text": "red"
  }
}

popup

The background color of popups (such as the URL bar dropdown and the arrow panels).

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "popup": "red"
  }
}

popup_border

The border color of popups.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "popup": "black",
     "popup_text": "white",
     "popup_border": "red"
  }
}

popup_highlight

The background color of items highlighted using the keyboard inside popups (such as the selected URL bar dropdown item).

Note: It's recommended to define popup_highlight_text to override the browser default text color on various platforms.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "popup_highlight": "red",
     "popup_highlight_text": "white"
  }
}

popup_highlight_text

The text color of items highlighted inside popups.

Note: Ensure the color used contrasts well with that used in popup_highlight.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "popup_highlight": "black",
     "popup_highlight_text": "red"
  }
}

popup_text

The text color of popups.

Note: Ensure the color used contrasts well with that used in popup.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "popup": "black",
     "popup_text": "red"
  }
}

sidebar

The background color of the sidebar.

See example

"theme": {
  "colors": {
     "sidebar": "red",
     "sidebar_highlight": "white",
     "sidebar_highlight_text": "green",
     "sidebar_text": "white"
  }
}

sidebar_border

The border and splitter color of the browser sidebar

See example

"theme": {
  "colors": {
     "sidebar_border": "red"
  }
}

sidebar_highlight

The background color of highlighted rows in built-in sidebars

See example

"theme": {
  "colors": {
     "sidebar_highlight": "red",
     "sidebar_highlight_text": "white"
  }
}

sidebar_highlight_text

The text color of highlighted rows in sidebars.

Note: Ensure the color used contrasts well with that used in sidebar_highlight.

See example

"theme": {
  "colors": {
    "sidebar_highlight": "pink",
    "sidebar_highlight_text": "red",
  }
}

sidebar_text

The text color of sidebars.

Note: Ensure the color used contrasts well with that used in sidebar.

See example

"theme": {
  "colors": {
     "sidebar": "red",
     "sidebar_highlight": "white",
     "sidebar_highlight_text": "green",
     "sidebar_text": "white"
  }
}

tab_background_separator Deprecated

Warning: tab_background_separator is not supported starting with Firefox 89.

The color of the vertical separator of the background tabs.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "tab_background_separator": "red"
  }
}

tab_background_text

The color of the text displayed in the inactive page tabs. If tab_text or bookmark_text isn't specified, applies to the active tab text.

Note: Ensure the color used contrasts well with those used in tab_selected or frame and frame_inactive.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "white",
    "tab_background_text": "red"
  }
}

tab_line

The color of the selected tab line.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "tab_line": "red"
  }
}

tab_loading

The color of the tab loading indicator and the tab loading burst.

See example

"theme": {
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "tab_loading": "red"
  }
}

tab_selected

The background color of the selected tab. When not in use selected tab color is set by frame and the frame_inactive.

See example

"theme": {
  "images": {
  "theme_frame": "weta.png"
},
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "tab_selected": "red"
  }
}

tab_text

From Firefox 59, it represents the text color for the selected tab. If tab_line isn't specified, it also defines the color of the selected tab line.

Note: Ensure the color used contrasts well with those used in tab_selected or frame and frame_inactive.

See example

"theme": {
  "images": {
  "theme_frame": "weta.png"
},
  "colors": {
     "frame": "black",
     "tab_background_text": "white",
     "tab_selected": "white",
     "tab_text": "red"
  }
}

toolbar

The background color for the navigation bar, the bookmarks bar, and the selected tab.

This also sets the background color of the "Find" bar.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "red",
    "tab_background_text": "white"
  }
}

toolbar_bottom_separator

The color of the line separating the bottom of the toolbar from the region below.

See example

"theme": {
  "colors": {
    "frame": "black",
    "tab_background_text": "white",
    "toolbar_bottom_separator": "red"
  }
}

toolbar_field

The background color for fields in the toolbar, such as the URL bar.

This also sets the background color of the Find in page field.

See example

"theme": {
  "colors": {
    "frame": "black",
    "tab_background_text": "white",
    "toolbar_field": "red"
  }
}

toolbar_field_border

The border color for fields in the toolbar.

This also sets the border color of the Find in page field.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "black",
    "tab_background_text": "white",
    "toolbar_field": "black",
    "toolbar_field_text": "white",
    "toolbar_field_border": "red"
  }
}

toolbar_field_border_focus

The focused border color for fields in the toolbar.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "black",
    "tab_background_text": "white",
    "toolbar_field": "black",
    "toolbar_field_text": "white",
    "toolbar_field_border_focus": "red"
  }
}

toolbar_field_focus

The focused background color for fields in the toolbar, such as the URL bar.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "black",
    "tab_background_text": "white",
    "toolbar_field": "black",
    "toolbar_field_text": "white",
    "toolbar_field_focus": "red"
  }
}

toolbar_field_highlight The background color used to indicate the current selection of text in the URL bar (and the search bar, if it's configured to be separate). See example

"theme": {
  "colors": {
    "toolbar_field": "rgb(255 255 255 / 91%)",
    "toolbar_field_text": "rgb(0 100 0)",
    "toolbar_field_highlight": "rgb(180 240 180 / 90%)",
    "toolbar_field_highlight_text": "rgb(0 80 0)"
  }
}

Here, the toolbar_field_highlight field specifies that the highlight color is a light green, while the text is set to a dark-to-medium green using toolbar_field_highlight_text.

toolbar_field_highlight_text

The color used to draw text that's currently selected in the URL bar (and the search bar, if it's configured to be separate box).

Note: Ensure the color used contrasts well with those used in toolbar_field_highlight.

See example

"theme": {
  "colors": {
    "toolbar_field": "rgb(255 255 255 / 91%)",
    "toolbar_field_text": "rgb(0 100 0)",
    "toolbar_field_highlight": "rgb(180 240 180 / 90%)",
    "toolbar_field_highlight_text": "rgb(0 80 0)"
  }
}

Here, the toolbar_field_highlight_text field is used to set the text color to a dark medium-dark green, while the highlight color is a light green.

toolbar_field_separator Deprecated

Warning: toolbar_field_separator is not supported starting with Firefox 89.

The color of separators inside the URL bar. In Firefox 58 this was implemented as toolbar_vertical_separator.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "black",
    "tab_background_text": "white",
    "toolbar_field_separator": "red"
  }
}

In this screenshot, "toolbar_vertical_separator" is the red vertical line in the URL bar dividing the Reader Mode icon from the other icons.

toolbar_field_text

The color of text in fields in the toolbar, such as the URL bar. This also sets the color of text in the Find in page field.

Note: Ensure the color used contrasts well with those used in toolbar_field.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "black",
    "tab_background_text": "white",
    "toolbar_field": "black",
    "toolbar_field_text": "red"
  }
}

toolbar_field_text_focus

The color of text in focused fields in the toolbar, such as the URL bar.

Note: Ensure the color used contrasts well with those used in toolbar_field_focus.

See example

"theme": {
  "colors": {
    "frame": "black",
    "toolbar": "black",
    "tab_background_text": "white",
    "toolbar_field": "black",
    "toolbar_field_text": "white",
    "toolbar_field_text_focus": "red"
  }
}

toolbar_text

The color of toolbar text. This also sets the color of text in the "Find" bar.

Note: For compatibility with Chrome, use the alias bookmark_text.

See example

"theme": {
  "colors": {
    "frame": "black",
    "tab_background_text": "white",
    "toolbar": "black",
    "toolbar_text": "red"
  }
}

toolbar_top_separator

The color of the line separating the top of the toolbar from the region above.

See example

"theme": {
  "colors": {
    "frame": "black",
    "tab_background_text": "white",
    "toolbar": "black",
    "toolbar_top_separator": "red"
  }
}

toolbar_vertical_separator

The color of the separator in the bookmarks toolbar. In Firefox 58, it corresponds to the color of separators inside the URL bar.

See example

"theme": {
  "colors": {
    "frame": "black",
    "tab_background_text": "white",
    "toolbar": "black",
    "toolbar_vertical_separator": "red"
  }
}

Aliases

Additionally, this key accepts various properties that are aliases for one of the properties above. These are provided for compatibility with Chrome. If an alias is given, and the non-alias version is also given, then the value will be taken from the non-alias version.

Name Alias for bookmark_text toolbar_text properties Name Type Description additional_backgrounds_alignment

Array of String

Optional

An array of enumeration values defining the alignment of the corresponding "additional_backgrounds": array item.
The alignment options include:

"bottom"
"center"
"left"
"right"
"top"
"center bottom"
"center center"
"center top"
"left bottom"
"left center"
"left top"
"right bottom"
"right center"
"right top".

If not specified, defaults to "right top".

additional_backgrounds_tiling

Array of String

Optional

An array of enumeration values defining how the corresponding "additional_backgrounds": array item repeats. Options include:

"no-repeat"
"repeat"
"repeat-x"
"repeat-y"

If not specified, defaults to "no-repeat".

color_scheme

String

Optional

Determines which color scheme is applied to the chrome (for example, context menus) and content (for example, built-in pages and the preferred color scheme for web pages). Options include:

"auto" â a light or dark scheme based automatically on the theme.
"light" â a light scheme.
"dark" â a dark scheme.
"system" â uses the system scheme.

If not specified, defaults to "auto".

content_color_scheme

String

Optional

Determines which color scheme is applied to the content (for example, built-in pages and preferred color scheme for web pages). Overrides color_scheme. Options include:

"auto" â a light or dark scheme based automatically on the theme.
"light" â a light scheme.
"dark" â a dark scheme.
"system" â the system scheme.

If not specified, defaults to "auto".

Examples

A basic theme must define an image to add to the header, the accent color to use in the header, and the color of text used in the header:

 "theme": {
   "images": {
     "theme_frame": "images/sun.jpg"
   },
   "colors": {
     "frame": "#CF723F",
     "tab_background_text": "#000"
   }
 }

Multiple images can be used to fill the header. Before Firefox version 60, use a blank or transparent header image to gain control over the placement of each additional image:

 "theme": {
   "images": {
     "additional_backgrounds": [ "images/left.png", "images/middle.png", "images/right.png"]
   },
   "properties": {
     "additional_backgrounds_alignment": [ "left top", "top", "right top"]
   },
   "colors": {
     "frame": "blue",
     "tab_background_text": "#ffffff"
   }
 }

You can also fill the header with a repeated image, or images, in this case a single image anchored in the middle top of the header and repeated across the rest of the header:

 "theme": {
   "images": {
     "additional_backgrounds": [ "images/logo.png"]
   },
   "properties": {
     "additional_backgrounds_alignment": [ "top" ],
     "additional_backgrounds_tiling": [ "repeat"  ]
   },
   "colors": {
     "frame": "green",
     "tab_background_text": "#000"
   }
 }

The following example uses most of the different values for theme.colors:

  "theme": {
    "images": {
      "theme_frame": "weta.png"
    },

    "colors": {
       "frame": "darkgreen",
       "tab_background_text": "white",
       "toolbar": "blue",
       "bookmark_text": "cyan",
       "toolbar_field": "orange",
       "toolbar_field_border": "white",
       "toolbar_field_text": "green",
       "toolbar_top_separator": "red",
       "toolbar_bottom_separator": "white",
       "toolbar_vertical_separator": "white"
    }
  }

It will give you a browser that looks like this:

In this screenshot, "toolbar_vertical_separator" is the white vertical line in the URL bar dividing the Reader Mode icon from the other icons.

Browser compatibility Chrome compatibility

In Chrome:

colors/toolbar_text is not used, use colors/bookmark_text instead.
images/theme_frame anchors the image to the top left of the header and if the image doesn't fill the header area tile the image.
all colors must be specified as an array of RGB values, like this:
```
"theme": {
  "colors": {
     "frame": [255, 0, 0],
     "tab_background_text": [0, 255, 0],
     "bookmark_text": [0, 0, 255]
  }
}
```
From Firefox 59 onward, both the array form and the CSS color form are accepted for all properties. Before that, colors/frame and colors/tab_background_text required the array form, while other properties required the CSS color form.

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