We are looking into that right now actually to make that easier, maybe you could file a specific bug. Are you using the iframe-picker in Firefox and that isn't working as expected?
1. JSFiddle. Run a fiddle with a loop (setTimeout/setInterval/requestAnimationFrame). Try to find it in the debugger. Fail
2. Add a `debugger` statement in the loop. Watch as Firefox doesn't display the code in the debugger
3. Add a syntax error, see message in console, click link to code, firefox doesn't display code.