The idea behind this is to make the heavy catpcha misuse by lazy webmasters a bit less unbearable, at a potentially hefty cost to privacy. Which is still appreciable in the rare cases when you use proxies without looking for privacy at the same time.

However, the add-on simply doesn't work. Clicking on "get more passes" just brings me to the add-on's website, which explains various interesting things about the extension but doesn't perform the task I was sent there for (giving me a way to obtain passes).

Edit: okay, it works, but there's a big trick: the "get more passes" feature won't particularly trigger a captcha. So, if the IP you want to unblock is blocked even from receiving catpchas (thanks Google!!) but your normal IP doesn't even trigger a catpcha, then you need to find yet another IP that's in the middle (does trigger catpchas, but isn't blocked from solving them). Then it will work (solving the captcha will give you a bunch of passes, which you can use on your other IP).
It really needs a proper way to manually trigger a catpcha...

Update: 3 years later, this is still the same hell, if not worse. This extension is a pathetic attempt from CloudFlare to get cheap karma to compensate the massive impairment they cause to privacy-conscious web users.

A bit ironic that this add-on is called Privacy Pass, this add-on is only for collecting your personal data. Beware.

Junk. Doesn't work. Just a sorry excuse to validate these captcha-crazy people that don't deserve a job in IT.

It doesn't work

$hit is GARBAGE! It does not work.

Useless for cloudflare security check - captcha images stuck in endless loop.
Don't waste your time.

it does not work or am i not doing something. i could cry with frustration wwith this captcha shit!!!!!!!!!

doesn't work

Doesn't work.

Doet niets. Laat alle captcha's zien en gaat niet verder. Houd bij dat je wat hebt ingevuld, maar verder doet deze niets.

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Korupt file...

Doesn't seem to work. Still getting pages that require completeing a Cloud Flare CAPTCHA. Unfortunately those pages are broken so completeing the CAPTCHA is impossible. :(