FireRainbow causes Firebug to lose focus of currently executing code

When Firebug hits a breakpoint neither the line of code nor the running script gets focused or highlighted. So you have to search for breakpoints in all the scripts you have.

**Steps to reproduce:**
1. Debug a page with multiple scripts.
2. Put a `debugger` statement in one of the files and start debugging.
3. Firebug loses focus on the currently executing line of code.