An extension I maintain, which works on Firefox/Chromium Edge/Chrome etc declares a content script to be run in all iframes.
Does safari support content scripts in iframes?
It seems the MessageSender object is missing the frameId member. It is thus impossible to tell what frame a content script is running in.
Manifest Excerpt
	"content_scripts": [
		{
			"matches": [
				"https://*/*",
				"http://*/*"
			],
			"js": [
				"content.js"
			],
			"match_about_blank": false,
			"all_frames": true,
			"run_at": "document_start"
		}
	],
MessageSender interface definition
/** An object containing information about the script context that sent a message or request.
@since Chrome 26.
/
export interface MessageSender {
		/** The ID of the extension or app that opened the connection, if any. */
		id?: string;
		/** The tabs.Tab which opened the connection, if any. This property will only be present when the connection was opened from a tab (including content scripts), and only if the receiver is an extension, not an app. */
		tab?: chrome.tabs.Tab;
		/**
		 * The frame that opened the connection. 0 for top-level frames, positive for child frames. This will only be set when tab is set.
		 * @since Chrome 41.
		 */
		frameId?: number;
Niq
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Must we wait until Safari 14 final is released sometime in September ?
Or can we submit to the App Store now for use with betas ?
I noticed in Safari 14 that browser.webNavigation.onHistoryStateUpdated seems to be missing.
Was this available in a prior beta? Or did I somehow only just notice?
In any case, are there plans to support this?