My Foscam camera worked fine over my wifi, before the upgrade. Now, the pc tells me that nplplam or plugin.xpi is blocked. What can I use to see my livestock, again?
I’m guessing - think they need to sign their XPI.
You can try to use Dev or Nightly version of browser, and disable xpi signing by setting “xpinstall.signatures.required” to false and then see if this error still happens.