Spoofing UA string

[Hex1a4 <hex1a4 gmail com>]

Hi,

Is there a way, and if so how, to spoof the user agent string for a
given site?  Sometimes sites have those stupid browser checks and I
can't access their content using Epiphany.  When I visit the site using
Firefox (one of the browsers checked for) the site works just fine, so
I know Epiphany will also work, if I can only get through that darn
browser check.  

Thank you.

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