Change colour of hyperlinks in Beamer presentation

[Loris Bennett]

Hi,

In my Beamer presentation the hyperlinks, all URLs, appear as normal
text and can only be identified by the change in the cursor when the
mouse moves over them.

How can I change the colour of such links? 

I have already several lines such as 

  #+LATEX_HEADER: \setbeamercolor{title}{fg=mFubMainGreen}

to tweak the appearance, but wasn't able to find an appropriate keyword
for URLs.

Cheers,

Loris

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