I have a Raspberry Pi running Ubuntu Mate 15.04 and have noticed that Youtube runs pretty slowly on it. I decided to try installing Minitube, but it said that it couldn't download "gdata.youtube.com/feeds/api/..." I tried to install smtube, but it simply said that it couldn't connect to Youtube. I thought this was pretty weird because I had Youtube open in Firefox directly in the background.

The contents of my hosts file follow:
127.0.0.1 localhost
127.0.1.1 RaspberryPi
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
Is there any reason for Firefox to work, but not smtube or minitube?