add firefox extension template

externs/webextension_polyfill/tabs/Tab.hx

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+package webextension_polyfill.tabs;
+
+typedef Tab = {
+	/**
+		The ID of the tab. Tab IDs are unique within a browser session. Under some circumstances a Tab may not be assigned an ID,
+		for example when querying foreign tabs using the $(ref:sessions) API, in which case a session ID may be present.
+		Tab ID can also be set to $(ref:tabs.TAB_ID_NONE) for apps and devtools windows.
+		Optional.
+	**/
+	@:optional
+	var id : Float;
+	/**
+		The zero-based index of the tab within its window.
+	**/
+	var index : Float;
+	/**
+		The ID of the window the tab is contained within.
+		Optional.
+	**/
+	@:optional
+	var windowId : Float;
+	/**
+		The ID of the tab that opened this tab, if any. This property is only present if the opener tab still exists.
+		Optional.
+	**/
+	@:optional
+	var openerTabId : Float;
+	/**
+		Whether the tab is highlighted. Works as an alias of active
+	**/
+	var highlighted : Bool;
+	/**
+		Whether the tab is active in its window. (Does not necessarily mean the window is focused.)
+	**/
+	var active : Bool;
+	/**
+		Whether the tab is pinned.
+	**/
+	var pinned : Bool;
+	/**
+		The last time the tab was accessed as the number of milliseconds since epoch.
+		Optional.
+	**/
+	@:optional
+	var lastAccessed : Float;
+	/**
+		Whether the tab has produced sound over the past couple of seconds (but it might not be heard if also muted).
+		Equivalent to whether the speaker audio indicator is showing.
+		Optional.
+	**/
+	@:optional
+	var audible : Bool;
+	/**
+		Whether the tab can be discarded automatically by the browser when resources are low.
+		Optional.
+	**/
+	@:optional
+	var autoDiscardable : Bool;
+	/**
+		Current tab muted state and the reason for the last state change.
+		Optional.
+	**/
+	@:optional
+	var mutedInfo : MutedInfo;
+	/**
+		The URL the tab is displaying. This property is only present if the extension's manifest includes the <code>"tabs"</code>
+		permission.
+		Optional.
+	**/
+	@:optional
+	var url : String;
+	/**
+		The title of the tab. This property is only present if the extension's manifest includes the <code>"tabs"</code>
+		permission.
+		Optional.
+	**/
+	@:optional
+	var title : String;
+	/**
+		The URL of the tab's favicon. This property is only present if the extension's manifest includes the <code>"tabs"</code>
+		permission. It may also be an empty string if the tab is loading.
+		Optional.
+	**/
+	@:optional
+	var favIconUrl : String;
+	/**
+		Either <em>loading</em> or <em>complete</em>.
+		Optional.
+	**/
+	@:optional
+	var status : String;
+	/**
+		True while the tab is not loaded with content.
+		Optional.
+	**/
+	@:optional
+	var discarded : Bool;
+	/**
+		Whether the tab is in an incognito window.
+	**/
+	var incognito : Bool;
+	/**
+		The width of the tab in pixels.
+		Optional.
+	**/
+	@:optional
+	var width : Float;
+	/**
+		The height of the tab in pixels.
+		Optional.
+	**/
+	@:optional
+	var height : Float;
+	/**
+		True if the tab is hidden.
+		Optional.
+	**/
+	@:optional
+	var hidden : Bool;
+	/**
+		The session ID used to uniquely identify a Tab obtained from the $(ref:sessions) API.
+		Optional.
+	**/
+	@:optional
+	var sessionId : String;
+	/**
+		The CookieStoreId used for the tab.
+		Optional.
+	**/
+	@:optional
+	var cookieStoreId : String;
+	/**
+		Whether the document in the tab can be rendered in reader mode.
+		Optional.
+	**/
+	@:optional
+	var isArticle : Bool;
+	/**
+		Whether the document in the tab is being rendered in reader mode.
+		Optional.
+	**/
+	@:optional
+	var isInReaderMode : Bool;
+	/**
+		Current tab sharing state for screen, microphone and camera.
+		Optional.
+	**/
+	@:optional
+	var sharingState : SharingState;
+	/**
+		Whether the tab is drawing attention.
+		Optional.
+	**/
+	@:optional
+	var attention : Bool;
+	/**
+		The ID of this tab's successor, if any; $(ref:tabs.TAB_ID_NONE) otherwise.
+		Optional.
+	**/
+	@:optional
+	var successorTabId : Float;
+	/**
+		The URL the tab is navigating to, before it has committed. This property is only present if the extension's manifest
+		includes the "tabs" permission and there is a pending navigation.
+		Optional.
+	**/
+	@:optional
+	var pendingUrl : String;
+};