saving-a-blob.html doesn't work on Firefox for ubuntu, but it works on Chrome

[ShihChinYang]

Hi,
I put saving-a-blob.html on my host - http://www.imareader.com/testStream/saving-a-blob.html. On Chrome, when I click on Start, it did save a sample.txt file to my computer. But it did not work on firefox, I checked the web-developers-tool, it showed

https://jimmywarting.github.io/StreamSaver.js/www.imareader.com/541895/sample.txt 404 Error,

Could someone please help? I really like StreamSaver

Many thanks and kind regards,
Shih-Chin Yang