Tiddly Wiki Classic Not Saving

[Nick]

I am running Mac Bootcamp.  I have booted to my Windows 10 bootcamp VM.  So I am not running parallels. 

I have tiddlyFox running on FireFox Developer Edition 52.0a2 (2017-01-23) (32-bit).

When I save I get 

[Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIFileOutputStream.init]" 
 nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)"  location: "JS frame :: chrome://tiddlyfox/content/overlay.js :: TiddlyFox.saveFile :: line 98"  data: no]

Because of 

function saveMain(localPath,original,posDiv)
{
	var save;
	try {
		var revised = updateOriginal(original,posDiv,localPath);
		save = saveFile(localPath,revised); //here
	} catch (ex) {
		showException(ex);
	}
	if(save) {
		displayMessage(config.messages.mainSaved,"file://" + localPath);
		store.setDirty(false);
	} else {
		alert(config.messages.mainFailed);
	}
}

Here are some links I looked at. 

• not saving and root is the owner problem

and initial save does not work

Please help.  I need my classic tiddlys.