Please post the whole error message so we can check it out. Is the error on one website, several, many?

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Thank you!

I literally just said "My school has a site" Just sayin' Here's a pic of the error. It happens when the site logs you out, but you're trying to load a page that requires you to be logged in, so i would just stop the script and reload the page to get the login screen.

Use this link to check that your plugins are up-to-date. If any are listed as unknown or research, do not worry about them.

https://support.mozilla.org/en-US/kb/warning-unresponsive-script

It says both are up to date. I know about the "fix" where you just extend the time before the warning is popping up. But i don't know yet if it works because i haven't had it on for long. However, that does not take away the fact the "don't ask me again" option isn't working. But i assume it's the site that poorly made in this case.

Mine never worked also. I just don't bother with it.

Oh well, i suppose it's just a matter of time before it's fixed, there's probably more pressing matters than fixing a tick box only a minority ever see.