(browser) Problem using cordova.file.dataDirectory

I'm using the file pluging togheter with the file transfer.

cordova.file.dataDirectory contains 'filesystem:file:///persistent/' and this does not look to be correct.
The download will fail here, but seems to be failing in the file plugin.

var fileTransfer = new FileTransfer();

fileTransfer.download(
	encodeURI('source url'),
	targetUrl, // cordova.file.dataDirectory + 'file.txt'
	function(entry) {
		// success
	},
	function(error) {
		$log.log("Download error source " + error.source);
		$log.log("Download error target " + error.target);
		$log.log("Download error code" + error.code);
	},
	false
);

I solved this by doing something like:

if($cordovaDevice.getPlatform() !== 'browser') {
	targetUrl = cordova.file.externalDataDirectory + 'media/' + filename;
}
else {
	// removed the media folder so that I do not have to create a directory, as it is not automatically created on the browser platform
	targetUrl = 'filesystem:'+ window.location.origin + '/persistent/' + filename;
}

Remark: for some reson, this works for 127.0.0.1, but not for localhost.

Plugins:
cordova-plugin-admobpro 2.28.3 "AdMob Plugin Pro"
cordova-plugin-browsertab 0.2.0 "cordova-plugin-browsertab"
cordova-plugin-buildinfo 1.1.0 "BuildInfo"
cordova-plugin-compat 1.1.0 "Compat"
cordova-plugin-device 1.1.6 "Device"
cordova-plugin-extension 1.5.1 "Cordova Plugin Extension"
cordova-plugin-file 4.3.2 "File"
cordova-plugin-file-transfer 1.6.2 "File Transfer"
cordova-plugin-inappbrowser 1.7.0 "InAppBrowser"
cordova-plugin-media 3.0.0 "Media"
cordova-plugin-music-controls 1.4.1 "MusicControls"
cordova-plugin-whitelist 1.3.2 "Whitelist"
cordova-plugin-x-toast 2.6.0 "Toast"
cordova-sqlite-storage 2.0.3 "Cordova sqlite storage plugin"
cordova-universal-links-plugin 1.2.1 "Universal Links Plugin"