WengoVisio Widget. Webcam Widget. Free Online PDF Tools. Webcam Toy. Create Chrome Theme Online. A theme is a special kind of extension that changes the way the google chrome browser looks. It is a zipped bundle of fles: one manifest.json file and several png images Here is an example manifest.json file for a theme: version: One to four dot-separated integers identifying the version of this theme. name: A short, plain text string (no more than 45 characters) that identifies the theme. description: A description text for your theme. images: Image resources for this theme. For example, "theme_ntp_background" uses to specify the background of the new tab pane. colors: Colors are in RGB format, which is used to specify the color of the bookmark text, frame, etc. tints: You can specify tints to be applied to parts of the UI such as buttons, the frame, and the background tab. properties: this field lets you specify properties such as background alignment, background repeat.