On Linux, the program runs in the background and uses a VNC server for the screen.
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Age
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Dimensions
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The PayPal buttons will appear here when you <a href="/accounts/signin?next=/priority">log in</a>.
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Not everybody has a farm of legacy machines with older OSes and browsers. There are online services that offer screenshots of websites in different browsers for considerable fees. For the hobbyist and for open source projects, these fees may be prohibitive.