Is there a petition for "make login work so I can sign petitions?"
Maybe you should make one! Oh...
I spent 10 minutes trying to log in using Chromium. It half-way showed that I was logged in, but I couldn't actually sign a petition. Logging in with Iceweasel (Firefox), it worked immediately.
I couldn't sign the petition (two petitions actually) with Firefox.
The maddening thing is that I was already logged in (the telltale at the bottom said so), but the Sign button was disabled.
Sent a complaint.
And they'll answer that petition by pointing out that they've made petitions available.
And that was the story of how the second Declaration of Independence came to be...