Is there an event in my Firefox extension that triggers before DOMContentLoaded and allows me to insert HTML while the document is still available?
Is there an event in my Firefox extension that triggers before DOMContentLoaded and allows me to insert HTML while the document is still available?
Important Update: Please note that this information pertains to XUL-based extensions, which are no longer supported as of Firefox 57. The functionalities discussed here are no longer accessible to extensions.
One useful content-document-global-created notification is broadcasted when a document is being created, before any content is actually added to it. This occurs as soon as the browser receives the HTTP headers of the response and determines that it is not a redirect. The DOMContentLoaded event is triggered once Gecko finishes downloading the document's contents, providing access to the complete DOM. There are other events in between, including various progress listener events - the specific event to use depends on the task at hand.
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