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How to Uninstall NexDef on Mac or PC

What is "MLBNexDefAutobahn"?

What is "MLBNexDefAutobahn"?

MLB NexDef Autobahn: Not a Virus, Not a Trojan, Just a Plugin

When my Mac slowed down, I checked the Activity Monitor and found a strange process hogging more real memory than any other program besides Firefox and the Mac OS X.

What IS "MLBNexDefAutobahn"? It's a plugin we forgot we downloaded when we subscribed to It runs all the time, even when your browser isn't open.

If you're on a Mac and want to start and stop it so it only runs while you're watching a game, open the [Unix] Terminal in the Utilities folder, then follow the directions here: Controlling MLB Nexdef on Mac OS X. I haven't found any such hack for PC.

If you want to uninstall the NexDef plugin, read on!

Disclaimer: The author of this page is not an MLB or Autobahn representative or a computer expert. I am just a frustrated customer who wants this thing off my computer. I adapted instructions from's well-hidden FAQ and tested it for Mac OS X. Use at your own risk (although as far as I know, this works).

Uninstall NexDef on Mac

Get This MLBAutobahnNexDef Whatsit off my Activity Monitor!

1. Open your User folder.

2. Go to Library folder > Application Support > Swarmcast

Scroll to Continue

3. Click UninstallAutobahn.command

Wait and pray. Phew! Gone. It'll probably open your Unix terminal.

(Note: OS X Lion has hidden the Library folder but don't worry, it's still there. To find the User's Library folder in OS X, go to Finder and choose Go > Go to Folder... and type ~/Library in the box.)

Uninstall NexDef on PC


1. Go to your Control Panel.

2. Go to Add/Remove Programs [Windows XP] or go to Programs and choose "Uninstall" [Windows 7/Vista]

3. Select "MLB.TV NexDef Plugin" from the list and click "Remove" [Windows XP] or "Uninstall [Windows 7/Vista]

For More Help, Contact Autobahn?

But since you won't be able to find them, good luck.

While trying to identify this unfamiliar thingie on my computer, I found a lot of unhappy people reporting problems with NexDef on various user forums. I traced this plugin back to a company named Autobahn, a site whose domain name has expired, and I can no longer find a trace of this company online.

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