OK I've moved it to the Computer forum. Hopefully someone will suggest something for you. There is a Mozilla forum you could try too, maybe someone there can assist. They'll likely want some techie info like the version of FF you're using and what OS you have too.
I've had other issues, like not being able to access the PayPal website, and O2 yesterday and someone else (forget who though LOL), also one of the Opus pages won't show the pictures.
Some of these issues are with my laptop though, as Chrome doesn't work for them either.
You could try with Chrome to see if it's a FF issue or your system?
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