On Mac, it's possible to run the screenshot factory in the background, using fast user switching and a separate user account.
843.
You cannot add browsers to a non-existed factory.
844.
Minor
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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:
846.
Click on the error code for documentation, or the error message to see the screenshot.