WebExtension.addOnUserMessageReceived

This signal is emitted when a #WebKitUserMessage is received from the #WebKitWebContext corresponding to @extension. Messages sent by #WebKitWebContext are always broadcasted to all #WebKitWebExtension<!-- -->s and they can't be replied to. Calling webkit_user_message_send_reply() will do nothing.

class WebExtension
gulong
addOnUserMessageReceived
(,
ConnectFlags connectFlags = cast(ConnectFlags)0
)

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Since

2.28