Find all needed information about Onmessage Event Support. Below you can see links where you can find everything you want to know about Onmessage Event Support.
https://www.w3schools.com/jsref/event_onmessage_sse.asp
The onmessage event occurs when a message is received through an event source. The event object for the onmessage event supports the following properties: data - Contains the actual message; origin - The URL of the document that invoked the event; lastEventId - the identifier of the last message seen in the event stream; Related events:
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onmessage
The onmessage property of the WindowEventHandlers mixin is the EventHandler called whenever an object receives a message event.
https://developer.mozilla.org/en-US/docs/Web/API/Worker/onmessage
Mar 24, 2019 · The onmessage property of the Worker interface represents an EventHandler, that is a function to be called when the message event occurs. These events are of type MessageEvent and will be called when the worker's parent receives a message (i.e. from the DedicatedWorkerGlobalScope.postMessage method).
http://help.dottoro.com/ljjqtjsj.php
Occurs when the postMessage method sends a message to the current window. Note: The onmessage event is supported in Firefox from version 3 and in Internet Explorer from version 8. For security restrictions, the contents of a document cannot be accessed from another document in JavaScript, if the two documents are located in different domains.
https://docs.microsoft.com/en-us/dotnet/api/microsoft.servicebus.messaging.queueclient.onmessage
OnMessage(Action<BrokeredMessage>) Processes a message in an event-driven message pump. OnMessage(Action<BrokeredMessage>, OnMessageOptions) Processes a message in an event-driven message pump, with the given set of OnMessageOptions options.
https://stackoverflow.com/questions/44056271/chrome-runtime-onmessage-response-with-async-await
From the documentation for chrome.runtime.onMessage.addListener: This function becomes invalid when the event listener returns, unless you return true from the event listener to indicate you wish to send a response asynchronously (this will keep the message channel open to the other end until sendResponse is called).
https://stackoverflow.com/questions/9904490/jquery-doesnt-support-postmessage-event
jQuery doesn't support postmessage event? Ask Question Asked 7 years, 9 months ago. ... and this operation may not properly support the message event (yet). Try using the originalEvent property to fetch your data: $(window).on("message", function(e) { var data = e.originalEvent.data; // Should work. ... Some browsers use the "onmessage" event ...
https://support.mozilla.org/questions/1273938
If the bug 1356546 mentioned didn't resolve the issue then file a new firefox bug. Otherwise you can try to split your data up as was mentioned in comments, that wouldn't reduce the overall time, but it might reduce the affect on UX, or just don't support Firefox until they fix their webextensions bugs.
https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_onmessage_sse
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