composeScripts API

This compose scripts API first appeared in Thunderbird 77. Functionally it is the same as the content scripts API except that it works on the document of email messages during composition. See the MDN documentation for a more in-depth explanation and Thunderbird 77 Beta for examples.

Note

Registering a compose script in the manifest.json file is not possible at this point.

Note

The permission compose is required to use messenger.composeScripts.*.

Functions

register(composeScriptOptions)

Register a compose script programmatically

Parameters

composeScriptOptions

(RegisteredComposeScriptOptions)

Required permissions

compose

Types

RegisteredComposeScript

An object that represents a compose script registered programmatically

object

unregister() Unregister a compose script registered programmatically

RegisteredComposeScriptOptions

Details of a compose script registered programmatically

object

[css]

(array of ExtensionFileOrCode, optional)

The list of CSS files to inject

[js]

(array of ExtensionFileOrCode, optional)

The list of JavaScript files to inject

External Types

The following types are not defined by this API, but by the underlying Mozilla WebExtension code base. They are included here, because there is no other public documentation available.

ExtensionFileOrCode

Specify code, either by pointing to a file or by providing the code directly. Only one of the two is allowed.

object

code

(string)

Some JavaScript code to register.

file

(string)

A URL starting at the extension’s manifest.json and pointing to a JavaScript file to register.