Themes
A theme is a special kind of extension that changes the way the browser looks. Themes are packaged like regular extensions, but they don't contain JavaScript or HTML code.
You can find and try a bunch of themes at the Chrome Web Store.
Manifest
Here is an example
manifest.json
file for a theme:
{ "version": "2.6", "name": "camo theme", "theme": { "images" : { "theme_frame" : "images/theme_frame_camo.png", "theme_frame_overlay" : "images/theme_frame_stripe.png", "theme_toolbar" : "images/theme_toolbar_camo.png", "theme_ntp_background" : "images/theme_ntp_background_norepeat.png", "theme_ntp_attribution" : "images/attribution.png" }, "colors" : { "frame" : [71, 105, 91], "toolbar" : [207, 221, 192], "ntp_text" : [20, 40, 0], "ntp_link" : [36, 70, 0], "ntp_section" : [207, 221, 192], "button_background" : [255, 255, 255] }, "tints" : { "buttons" : [0.33, 0.5, 0.47] }, "properties" : { "ntp_background_alignment" : "bottom" } } }
colors
Colors are in RGB format.
To find the strings you can use within the "colors" field,
see
kOverwritableColorTable
.
images
Image resources use paths relative to the root of the extension.
You can override any of the images that are specified by the
strings in
kPersistingImages
.
properties
This field lets you specify
properties such as background alignment,
background repeat,
and an alternate logo.
To see the properties and the values they can have, see
kDisplayProperties
.
tints
You can specify tints to be applied to parts of the UI
such as buttons, the frame, and the background tab.
Google Chrome supports tints, not images,
because images don't work across platforms
and are brittle in the case of adding new buttons.
To find the strings you can use within the "tints" field,
see
kTintTable
.
Tints are in Hue-Saturation-Lightness (HSL) format, using floating-point numbers in the range 0 - 1.0:
- Hue is an absolute value, with 0 and 1 being red.
- Saturation is relative to the currently provided image. 0.5 is no change, 0 is totally desaturated, and 1 is full saturation.
- Lightness is also relative, with 0.5 being no change, 0 as all pixels black, and 1 as all pixels white.
You can alternatively use -1.0
for any of the HSL values
to specify no change.