It works for me, for the most part. I saw my firewall logs and somebody else mentioned some shady looking urls:
globalupload.io
gateway.ipfs.io
ipfs.infura.io
gateway.temporal.cloud
gateway.pinata.cloud
cloudflare-ipfs.io
dweb.link

It's crazy to have such checking for updates every startup at 24 hour internals with no way to change this is a bit excessive. I disabled whitelist. downloaded the whitelist , modified it to my own liking and stored it as a local file. This add-on would be vastly improved it had a easier to use and more intuitive interface for managing websites if they break. Last update was 3 years ago so I guess that's it for this add-on.

ошибка выгрузки

Thanks! Yes this addon works as intended, however, I can't seem to make the exceptions work or even a whitelisted site I add. No matter what I do, the whitelisted site or exception is blocked...please advise...

It used to work fine for me... until the last update. One should never activate "automatic updates"!.
I use Firefox-ESR under Debian Linux 8. After the update, SmartReferer just doesn't send the Referrer to xyz.eu, though i have defined an exception * xyz.eu. I didn't change a thing, a few days ago, it still worked all right. Is there a way to install the old version?

When i have enable the addon, i can't watch videos on Facebook...by disabling the addon everything is ok. The problem is only on FB...please fix that issue.
Windows 7 64bit Firefox 61.0 beta 13