Working in Firefox 53 / 32 bit / Windows Rated 3 out of 5 stars

Tested linking to https://www.whatismyreferer.com/ from a Google search, 23rd April 2017.
Setting rules to send the normal referer, a forged referer, no referer and a custom text string all worked as they should. Toggling the extension off from its toolbar icon resulted in the normal referer as expected.

Other active extensions were HTTPS Everywhere, uBlock Origin, and NoScript.

Not a WebExtension and thus incompatible with Firefox 57+. Suitable alternatives, including more general purpose header control extensions, may be available; look for something updated more recently than March 2016 when WebExtensions were added in Firefox 45.

My irritation with the people who allowed "HTTP referer" to be codified without it seeing the light of spellcheck continues to grow.

STOPPED WORKING 4/2/2017 Rated 1 out of 5 stars

I'm not sure what happened but it just stopped redirecting websites out of nowhere. Gonna use an alternative add-on. L

Great plugin, but multiprocess compatibility missing? Rated 4 out of 5 stars

I don't want to miss this plugin, however, it is not marked to be compatible with multiprocess Firefox (Electrolysis, E10S). Nonetheless, I have not noticed any flaws using RefControl together with E10S (FF 51.0.1 64-Bit, Linux).
Unfortunately, RefControll does not seem to be maintained any longer…

Needs update Rated 1 out of 5 stars

Doesn't change useragent in Firefox 48.0

Excellent but needs update for Firefox 48.0 Rated 5 out of 5 stars

I love this addon but it requires validation by Mozilla to be usable in Firefox 48.0

ダウンロード出来ない Rated 1 out of 5 stars

タブじゃ駄目ってことかな。

Rated 5 out of 5 stars

Simple and effective. Works on Pale Moon.

very effective! Rated 5 out of 5 stars

love it. does what it says!

Simple and effective Rated 5 out of 5 stars

Does what it says. Some sites will not function properly without a valid reference, and in those cases it is very quick and easy to switch the RefControl on/off for a particular site either permanently in the settings or temporarily.

White list does not work with IDN domains Rated 3 out of 5 stars

White list does not work with IDN domains. Reference blocking is always on for domains with internationalized names despite added to white list both in native language and punycoded.

Very good! Rated 5 out of 5 stars

This add-on is exactly what I was looking for. It's multi-site, multi-language and the most important thing: it works!

Thank you!

Excellent Rated 5 out of 5 stars

Get around pesky content walls like WSJ or NYT by Referer:ing from Google.

Rated 5 out of 5 stars

Works great. This should be a default feature in Firefox, seriously.

Very good Rated 5 out of 5 stars

Thanks.
Could also make version for Firefox for android?

This user has a previous review of this add-on.

Rated 4 out of 5 stars

Sehr nützlich gegen Schnüffelei. Arbeitet unauffällig im Hintergrund. Kleine Nachteile:
- Standardmäßig ist keine Blockierung eingestellt, unerfahrene Nutzer bemerken das evtl. nicht
- Manche Seiten funktionieren nicht, für diese muss eine Ausnahme eingestellt werden - dafür kann das Addon aber nichts.

Rated 5 out of 5 stars

Extremely useful, thanks a lot!

Rated 1 out of 5 stars

par rsngfrce le September 13, 2014 · >> + 1 ;)

I had the same problem myself and had to disable addons one by one to find out why the captcha or some pages may not display correctly.

preferably Rated 2 out of 5 stars

Although RefControl is a great extension, I like HeaderControlRevived better. Not only because it offers more (besides Referer it offers Useragent and Language options), but because it doesn't show up as toolbar button on control panel every time I start my browser and work smoothly too.

This review is for a previous version of the add-on (0.8.16.1-signed.1-signed). 

Rated 5 out of 5 stars

I simply want to thank you for supporting Mozilla SeaMonkey. My full respect to you!

This review is for a previous version of the add-on (0.8.16.1-signed.1-signed). 

Rated 2 out of 5 stars

Bug: Click icon to disable RefControl (you see red X) -> restart browser -> you see icon without red X (extension should work) -> RefControl NOT WORK

edit:
I also see lot of exceptions from refcontrol in browser console:

[Exception... "Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIURI.spec]"...

This review is for a previous version of the add-on (0.8.16.1-signed.1-signed).