How do I see the list of addins and plugins in Visual Studio?

I think I have a plugin or addin to studio installed which has killed all versions of studio.

Where can I see the list of plugins and addins that studio is loading? I believe I have gone through all of the menu to find the list of addins.

Would someone point me in the direction that shows me the list of addins? I will remove them all one by one until I find the one that is "killing my productivity" for the day. :)