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

  • 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, 2011 at 14:33
  • 1
    The Unarchiver is not a SIMBL plugin. Mar 8, 2011 at 14:39

2 Answers 2


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.


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

  • 7
    It's used by a whole lot more than just that.
    – geekosaur
    Mar 7, 2011 at 21:10
  • 3
    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. Jan 16, 2015 at 4:06

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