Error messages popping up on Facebook???

[Catty1]

Popups can be caused by spyware in your computer, too - it may not be just Facebook.

www.malwarebytes.org - download the free version on the left, install it, and run the Short scan.

If you use it in the future, remember to update it each time (click the Updates tab).

[smokey the elder]

That is a very good piece of software. I had an issue at my work where the regular firewall/AV wouldn't block/remove a spyware but that one did!