Issues in Firefox

Hello,

Hcaptcha isn’t displaying in Firefox properly.

For e.g. using it on bbpress for topic creation, it works fine in Edge; however on Firefox it does not show up.

Console shows:

SyntaxError: bad method definition – hcaptcha.js:40:1

It refers to the getWidgetId = ( el ) => { line of the from the snippet below:

	 * Get hCaptcha widget id.
	 *
	 * @param {HTMLDivElement} el Form element.
	 * @returns {string}
	 */
	getWidgetId = ( el ) => {
		return el.getElementsByClassName( 'h-captcha' )[ 0 ].getElementsByTagName( 'iframe' )[ 0 ].dataset.hcaptchaWidgetId;
	};