Uservoice will not work on Firefox

In Firefox when I try to add my votes to anything on ogs.uservoice I get “We couldn’t submit your vote at this time.” Anybody else having this issue or similar?
It works using Chrome beta, but I’d rather not have to use Chrome if I don’t have to.
Firefox 34.05 on Arch Linux.

Tested with the same setup, worked. (I guess you meant 34.0.5)

I did, and its still not working for me. I don’t know what is causing it, it could be some add-on or maybe some other package like flash, but since its not affecting anybody else I guess it doesn’t matter too much.