Cross Site Action Detected
Recently I tried to reboot my router from within Firefox. I was greeted with this error:
400 Bad Request Cross Site Action detected!
Some nominal investigating revealed the error was created by the DD-WRT firmware.
I am using the RefControl add-on with Firefox. The solution is to allow referrer headers from the router IP address.
I hadn’t before seen this warning page. I recall several weeks ago having “cleaned house” of many old and stagnant Firefox settings. Likely I then inadvertently deleted the Refcontrol option for the router.