STR: 1) Add a debugger statement in a b-c test or some code that runs during it 2) Run the test with ./mach mochitest-browser --jsdebugger … 3) Run the code that has the debugger statement Actual result: The execution of the test is paused but there is no feedback. It looks like the test is stuck. The Browser Toolbox window isn't visible since it is behind the browser window. Expected result: The Browser Toolbox window comes to the foreground so I can see that it has been hit and can then debug the problem.