Right-click on breakpoint symbol for the line to set the conditional expression. Try it by setting breakpoint on line 19 and set conditional expression of color == 'green'
For Logpoint/Tracepoint, use console.log as the conditional expression on a breakpoint. console.log always returns falsey, so breakpoint is never triggered, but console.log is always executed. Try it by setting breakpoint on line 19 and set conditional expression of console.log('currentNum ' + currentNum + ' color ' + color)
For IE8 and call stack if you want function name to be listed you'll want to use named function expressions (see updateUi function) or function declarations (see decrease function).
Mouse over variable works in IE9+, Chrome and Firefox
Mouse over expression works in IE9+ and Chrome
Open JS files quicker in IE11, Chrome and Firefox using Ctrl+O
debugger; statement only drops into debugger when statement is executed.