Instead of you chasing ghosts down the road I thought I’d share this.
I recently installed Visual Studio 2013.
While debugging my very first app I got some weird errors in VS2013 that cause browser freezes and slowness in all browsers. Firefox was nice enough to tell me that some script was causing an error and had something to do with "browserLink:37".
Long story short, in VS 2013 a thing called “Browser Link” is enabled. I believe this allows for more in depth debugging however it caused my forms to be behave very badly. You can disable this as shown in the screenshot below.