It's not a sign of anything wrong as we know that people like you and I write the code. It only means they need to re-write the code.
I have a business page on Facebook and post a lot. I schedule posts every day. For the last 3 days I have been getting warnings of an Unresponsive Script. I use Windows Vista and Firefox as my browser.
It says Script:
I have to hit stop script and my post will usually then go through, but I have to refresh the page to do anything more. It does not do it every time, but about every other. I need to know what to do to get rid of it. I have asked and no one else seems to be having the same trouble with Facebook.