Expand Firefox PerfStats collection to new metrics, 64bit

Author: acreskeyMoz

lib/core/engine/command/perfStats.js

@@ -26,7 +26,7 @@ export class PerfStatsInterface {
    * @throws {Error} Throws an error if not running Firefox.
    */
   // eslint-disable-next-line prettier/prettier
-  async start(featureMask = 0xFF_FF_FF_FF) {
+  async start(featureMask = 0xFFFF_FFFF_FFFF_FFFFn) {
     if (this.options.browser === 'firefox') {
       return this.PerfStats.start(featureMask);
     } else {