Chrome works fine but Firefox JS Error

I changed the code to become like this so it will works.

// Install
self.addEventListener(‘install’, function(e) {
console.log(‘SuperPWA service worker installation’);
e.waitUntil(
caches.open(cacheName).then(function(cache) {
console.log(‘SuperPWA service worker caching dependencies’);
//return cache.addAll(filesToCache);

/*
Solution 1
return Promise.all(
filesToCache.map(function (url) {
return cache.add(url).catch(function (reason) {
return console.log(url + “failed: ” + String(reason));
});
})
);*/

// Solution 2 without debug
return Promise.all(
filesToCache.map(function(url){ cache.add(url) })
);
})
);
});