Sehr gut für mehr Privatsphäre!
Hier wird alles hervorragend und leicht verständlich erklärt: https://www.kuketz-blog.de/firefox-smart-referer-firefox-kompendium-teil6/
Dort steht als Fazit geschrieben: Über welchen Suchbegriff ein Besucher auf eine Webseite gelangt ist oder welche Webseite sich jemand gerade anschaut, mag für einige Protagonisten eine wertvolle Information darstellen. Aus Nutzersicht kann die Sammlung und Auswertung der HTTP-Referer-Informationen allerdings einen Eingriff in die Privatsphäre darstellen, den niemand einfach tolerieren muss. Mittels Smart Referer wird der ursprüngliche HTTP-Referer so umgeschrieben, dass der jeweilige Empfänger daraus keine verwertbaren Informationen extrahieren kann.

Great

Does exactly what it says.

A nice way to keep your navigation private. Thanks for this!

It's not 100% perfect, e.g. no Chrome version, a few bugs here and there, but all in all this seems fantastic. Nothing else seems to encapsulate this functionality (except Tor Browser), which is really a shame. The referer header is a significant source of information leakage which has been around since the web was invented. I'm surprised that this extension is perhaps the only way to defend against such leakage with ease. It certainly brings a greater peace of mind with respect to people being able to track your movements.

ขอบคุณ

Good

Indispensable addon! A must have!

Requests:
Can it be possible to add exceptions from the toolbar icon?

It gives a piece of mind in terms of online privacy and security. I have not encountered any problem with it so far.

Great extension.
If this extension add the Import/Export rules function,this extension will be better.

Awesome add-on!

I installed this as a replacement to RefControl, because of that WebExtension mess.

I just installed it, so I'll have to test it longer to be sure, but so far I like the concept of only forging cross-doman requests: that seems like a smart way to avoid most of the trouble that could be caused by forging everything like I used to.