add firefox extension template

externs/webextension_polyfill/pkcs11/ModuleSlot.hx

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+package webextension_polyfill.pkcs11;
+
+typedef ModuleSlot = {
+	/**
+		The name of the slot.
+	**/
+	var name : String;
+	/**
+		The token of the slot.
+	**/
+	var token : Null<Token>;
+};

externs/webextension_polyfill/pkcs11/Static.hx

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+package webextension_polyfill.pkcs11;
+
+typedef Static = {
+	/**
+		checks whether a PKCS#11 module, given by name, is installed
+	**/
+	function isModuleInstalled(name:String):js.lib.Promise<Bool>;
+	/**
+		Install a PKCS#11 module with a given name
+	**/
+	function installModule(name:String, ?flags:Float):js.lib.Promise<ts.Undefined>;
+	/**
+		Remove an installed PKCS#11 module from firefox
+	**/
+	function uninstallModule(name:String):js.lib.Promise<ts.Undefined>;
+	/**
+		Enumerate a module's slots, each with their name and whether a token is present
+	**/
+	function getModuleSlots(name:String):js.lib.Promise<Null<Any>>;
+};

externs/webextension_polyfill/pkcs11/Token.hx

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+package webextension_polyfill.pkcs11;
+
+typedef Token = {
+	/**
+		Name of the token.
+	**/
+	var name : String;
+	/**
+		Name of the token's manufacturer.
+	**/
+	var manufacturer : String;
+	/**
+		Hardware version, as a PKCS #11 version number (two 32-bit integers separated with a dot, like "1.0".
+	**/
+	var HWVersion : String;
+	/**
+		Firmware version, as a PKCS #11 version number (two 32-bit integers separated with a dot, like "1.0".
+	**/
+	var FWVersion : String;
+	/**
+		Serial number, whose format is defined by the token specification.
+	**/
+	var serial : String;
+	/**
+		true if the token is logged on already, false otherwise.
+	**/
+	var isLoggedIn : Bool;
+};