Screenshot_2018-05-21-19-32-39-507_org.mozilla.firefox.png

This is the mobile version in Firefox. As u can see,  there is no download button , which used to appear beside the + icon. 

Screenshot_2018-05-21-19-32-58-252_org.mozilla.firefox.png

This is the desktop version in Firefox,  using HP. There is a download button. 

Screenshot_2018-05-21-19-33-18-094_org.mozilla.firefox.png

After I click the download button,  it normally has a notification that it is downloading but there isn't. 

Screenshot_2018-05-21-19-40-39-098_org.mozilla.firefox.png

As you can see,  there is no new download under my downloads from Firefox. 

Thanks for the quick reply. 

Mychel

Browser: Chrome Mobile 66.0.3359 Android
User Agent: Mozilla/5.0 (Linux; Android 6.0.1; Redmi Note 4X Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.158 Mobile Safari/537.36

 Sorry I just realised that I must open desktop version on my HP then I can see the download button. But I've tried clicking it and it does not work. 

However,  previously when I remain in mobile version,  I am able to download all my YouTube videos. 

Now,  none of the videos can be downloaded. 

Eg. 

Best regards, 

Mychel