I have seen websites that leave a few "debugger" keywords in the code and then use timing code to detect if you have the dev tools open. that is, if it takes to

I have seen websites that leave a few "debugger" keywords in the code and then use timing code to detect if you have the dev tools open. that is, if it takes too long to get to a check point, as in a person had to click resume, you know the debugger is open. It is very crude method but I guess was the best they came up with. On firefox the easy way to get around this is by disabling breakpoints, the harder way is a userscript.