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Is this something loaded by Apple or did it come with some third party app I must have downloaded.

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One SIMBL Extension i have installed is "The Unarchiever" which replaces the Finder File-Compression/decompression-Function and supports more Formats. – J.C. Mar 8 '11 at 14:33
The Unarchiver is not a SIMBL plugin. – Loïc Wolff Mar 8 '11 at 14:39
up vote 13 down vote accepted

SIMBL is not a part of Apple's Mac OS X package, but is an extension that can be used by other developers in their own work to extend applications where they may not have the original source code (like Safari). SIMBL-related files can be found either in /Library/Application Support/SIMBL/Plugins or ~/Library/Application Support/SIMBL/Plugins.

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For a more “technical” response, see the simbl page directly: – Martín Marconcini Nov 11 '10 at 21:37
For 10.7 & 10.8 see: – Stefan Schmidt Mar 2 '13 at 19:14

It is usually used by SafariFlvSniffer.bundle which comes with a video downloader app.

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It's used by a whole lot more than just that. – geekosaur Mar 7 '11 at 21:10
It is used by tons of other plugins. LastPass is the plugin I currently use that uses it. Definitely just check /Library/Application Support/SIMBL/Plugins on your machine to see what is using it for you. – Joshua Dance Jan 16 '15 at 4:06

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