add firefox extension template

externs/webextension_polyfill/search/Disposition.hx

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+package webextension_polyfill.search;
+
+/**
+	Location where search results should be displayed.
+**/
+typedef Disposition = String;

externs/webextension_polyfill/search/QueryQueryInfoType.hx

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+package webextension_polyfill.search;
+
+typedef QueryQueryInfoType = {
+	/**
+		String to query with the default search provider.
+	**/
+	var text : String;
+	/**
+		Location where search results should be displayed. CURRENT_TAB is the default.
+		Optional.
+	**/
+	@:optional
+	var disposition : Disposition;
+	/**
+		Location where search results should be displayed. tabId cannot be used with disposition.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+};

externs/webextension_polyfill/search/SearchEngine.hx

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+package webextension_polyfill.search;
+
+/**
+	An object encapsulating a search engine
+**/
+typedef SearchEngine = {
+	var name : String;
+	var isDefault : Bool;
+	/**
+		Optional.
+	**/
+	@:optional
+	var alias : String;
+	/**
+		Optional.
+	**/
+	@:optional
+	var favIconUrl : String;
+};

externs/webextension_polyfill/search/SearchSearchPropertiesType.hx

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+package webextension_polyfill.search;
+
+typedef SearchSearchPropertiesType = {
+	/**
+		Terms to search for.
+	**/
+	var query : String;
+	/**
+		Search engine to use. Uses the default if not specified.
+		Optional.
+	**/
+	@:optional
+	var engine : String;
+	/**
+		Location where search results should be displayed. NEW_TAB is the default.
+		Optional.
+	**/
+	@:optional
+	var disposition : Disposition;
+	/**
+		The ID of the tab for the search results. If not specified, a new tab is created, unless disposition is set.
+		tabId cannot be used with disposition.
+		Optional.
+	**/
+	@:optional
+	var tabId : Float;
+};

externs/webextension_polyfill/search/Static.hx

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+package webextension_polyfill.search;
+
+typedef Static = {
+	/**
+		Gets a list of search engines.
+	**/
+	function get():js.lib.Promise<Array<SearchEngine>>;
+	/**
+		Perform a search.
+	**/
+	function search(searchProperties:SearchSearchPropertiesType):Void;
+	/**
+		Use the chrome.search API to search via the default provider.
+	**/
+	function query(queryInfo:QueryQueryInfoType):js.lib.Promise<ts.Undefined>;
+};