Values of this type are objects. They contain the properties listed below.

The first three properties - type, title, message - are mandatory in notifications.create(), but optional in notifications.update(). Firefox currently: only supports the type, title, message, and iconUrl properties; and the only supported value for type is 'basic'.

type

notifications.TemplateType. The type of notification you want. Depending on your choice here, certain other properties are either mandatory or are not permitted.

message

string. The notification's main content.

title

string. The notification's title.

iconUrl Optional

string. A URL pointing to an icon to display in the notification. The URL can be: a data URL, a blob URL, a http or https URL, or the relative URL of a file within the extension. When using an SVG image, ensure that the image includes height and width attributes, for example, <svg width="96" height="96"…. Otherwise, the image may not display.

contextMessage Optional

string. Supplementary content to display.

priority Optional

number. The notification's priority: may be 0, 1, or 2. Defaults to 0 if omitted.

eventTime Optional

number. A timestamp for the notification in milliseconds since the epoch.

buttons Optional

array of button. An array of up to 2 buttons to include in the notification. You can listen for button clicks using notifications.onButtonClicked. Each button is specified as an object with the following properties:

title

string. Title for the button.

iconUrl Optional

string. URL pointing to an icon for the button.

imageUrl

string. A URL pointing to an image to use in the notification. The URL can be: a data URL, a blob URL, or the relative URL of a file within the extension. When using an SVG image, ensure that the image includes height and width attributes, for example, <svg width="96" height="96"…. Otherwise, the image may not display.

This property is only permitted if type is "image". In this case, it is mandatory if the NotificationOptions is used in notifications.create(), and optional if it is used in notifications.update().

items

array of item. An array of items to include in the notification. Depending on the settings for the operating system's notification mechanism, some of the items you provide might not be displayed. Each item is specified as an object with the following properties:

title

string. Title to display in the item.

message

string. Message to display in the item.

This property is only permitted if type is "list". In this case, it is mandatory if the NotificationOptions is used in notifications.create(), and optional if it is used in notifications.update().

progress

integer. An integer between 0 and 100, used to represent the current progress in a progress indicator.

This property is only permitted if type is "progress". In this case, it is mandatory if the NotificationOptions is used in notifications.create(), and optional if it is used in notifications.update().

Note that appIconMaskUrl and isClickable are not supported.