add firefox extension template

externs/webextension_polyfill/activitylog/OnExtensionActivityDetailsType.hx

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+package webextension_polyfill.activitylog;
+
+typedef OnExtensionActivityDetailsType = {
+	/**
+		The date string when this call is triggered.
+	**/
+	var timeStamp : webextension_polyfill.extensiontypes.DateType;
+	/**
+		The type of log entry.  api_call is a function call made by the extension and api_event is an event callback to the
+		extension.  content_script is logged when a content script is injected.
+	**/
+	var type : OnExtensionActivityDetailsTypeTypeEnum;
+	/**
+		The type of view where the activity occurred.  Content scripts will not have a viewType.
+		Optional.
+	**/
+	@:optional
+	var viewType : OnExtensionActivityDetailsTypeViewTypeEnum;
+	/**
+		The name of the api call or event, or the script url if this is a content or user script event.
+	**/
+	var name : String;
+	var data : OnExtensionActivityDetailsTypeDataType;
+};

externs/webextension_polyfill/activitylog/OnExtensionActivityDetailsTypeDataResultType.hx

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+package webextension_polyfill.activitylog;
+
+/**
+	The result of the call.
+**/
+typedef OnExtensionActivityDetailsTypeDataResultType = { };

externs/webextension_polyfill/activitylog/OnExtensionActivityDetailsTypeDataType.hx

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+package webextension_polyfill.activitylog;
+
+typedef OnExtensionActivityDetailsTypeDataType = {
+	/**
+		A list of arguments passed to the call.
+		Optional.
+	**/
+	@:optional
+	var args : Array<Dynamic>;
+	/**
+		The result of the call.
+		Optional.
+	**/
+	@:optional
+	var result : OnExtensionActivityDetailsTypeDataResultType;
+	/**
+		The tab associated with this event if it is a tab or content script.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+	/**
+		If the type is content_script, this is the url of the script that was injected.
+		Optional.
+	**/
+	@:optional
+	var url : String;
+};

externs/webextension_polyfill/activitylog/OnExtensionActivityDetailsTypeTypeEnum.hx

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+package webextension_polyfill.activitylog;
+
+/**
+	The type of log entry.  api_call is a function call made by the extension and api_event is an event callback to the
+	extension.  content_script is logged when a content script is injected.
+**/
+typedef OnExtensionActivityDetailsTypeTypeEnum = String;

externs/webextension_polyfill/activitylog/OnExtensionActivityDetailsTypeViewTypeEnum.hx

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+package webextension_polyfill.activitylog;
+
+/**
+	The type of view where the activity occurred.  Content scripts will not have a viewType.
+**/
+typedef OnExtensionActivityDetailsTypeViewTypeEnum = String;

externs/webextension_polyfill/activitylog/OnExtensionActivityEvent.hx

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+package webextension_polyfill.activitylog;
+
+/**
+	Receives an activityItem for each logging event.
+**/
+typedef OnExtensionActivityEvent = {
+	/**
+		Registers an event listener <em>callback</em> to an event.
+	**/
+	function addListener(callback:(details:OnExtensionActivityDetailsType) -> Void, id:String):Void;
+	/**
+		Deregisters an event listener <em>callback</em> from an event.
+	**/
+	function removeListener(callback:(details:OnExtensionActivityDetailsType) -> Void):Void;
+	function hasListener(callback:(details:OnExtensionActivityDetailsType) -> Void):Bool;
+	function hasListeners():Bool;
+};

externs/webextension_polyfill/activitylog/Static.hx

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+package webextension_polyfill.activitylog;
+
+typedef Static = {
+	/**
+		Receives an activityItem for each logging event.
+	**/
+	var onExtensionActivity : OnExtensionActivityEvent;
+};