Browsershots respects the robots.txt standard. If you want, you can explicitly allow Browsershots by adding a section like this to the robots.txt file on your server:
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The best solution on Windows is to install the browser in a subdirectory of the shotfactory folder, e.g. shotfactory\firefox30, then enter firefox30\firefox.exe in the browser command field.
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Browsers
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Screen Height
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%(seconds)d s
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Click for full size.
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We're trying to make this service easy to use, open for all (including access to the source code) and 100%% free.