Debugging script doesn't appear in "Source" tab (Win7 32-bit)

[Elnee]

I have just a .js file. For example, this:

When I try to debug this I usually have next result:

Javascript, as you can see, executes normally. But in tab "Source" is nothing. Source code doesn't appear:

I like devtool and I'll be very grateful if you fix it. I use Win7 32-bit.