composeScripts

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 Changes in Thunderbird 77 for examples.

See also executeScript, insertCSS, removeCSS, and messageDisplayScripts.

Note

Registering a compose script through manifest.json is not possible at this point.

Permissions

messagesModify

Read and modify your email messages as they are displayed to you

Note

The permission compose is required to use composeScripts.

Functions

register(composeScriptOptions)

Register a compose script programmatically

Parameters

composeScriptOptions

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)

The list of CSS files to inject

[js]

(array of ExtensionFileOrCode)

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.