Bug when posting threads with Firefox 34.0.5

I can't see the textarea when creating forum threads or tickets with Firefox 34.0.5?

The error seems to be on this line:

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This reply is written using FireFox 34.0.5 and the text area works fine.

Could you please try another browser / another computer?

It works in Chrome. I've attached a screenshot of the behaviour and a screenshot of the error.

The issue is no longer here but I'm not sure why. I removed a bunch of my firefox add-ons and the issue resolved itself. I tried to reinstall the add-ons to replicate the issue but it does not seem to come back. It may have been something to do with user agent.