Yourbrowser.is
Have you ever been helping someone troubleshoot a technical problem over the phone and needed them to tell you what browser/operating system/IP/etc they were using?
There's an easy way to tackle this --- simply have them navigate to yourbrowser.is and tell you what they see (or email you the report)!
I can see this site having potential in troubleshooting OverDrive, LINKcat, webpage, or online database issues...
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