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I have weird problem:

Often, when I go to, Firefox turns on blocking of cookies for that domain. It's only when I go to the front page.

I've created a video of what happens: (4,5MB) (and uploaded to Vimeo if your don't trust the first link:

Recently, I also experienced this on a particular subpage of

Does anyone know what's going on?

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are they 3rd party cookies?,2817,2415810,00.asp do you have any privacy software (ghostery, TACO, Disconnect, etc) – Frank Thomas Oct 2 '13 at 12:15
No, it's not 3rd party cookies. It is -- most importantly -- my login/session that is lost. Yes, I have some of these add-ons. I'll try disabling them and see. – decibyte Oct 2 '13 at 12:23
Upload the video to YouTube. its not reasonable to expect us to download a random video of unknown content. At least if its on YouTube if it contains content that is proper it can be removed. – Ramhound Oct 2 '13 at 12:31
@Ramhound: Well, here the video is on Vimeo: (I hope they are trustworthy in your eyes) – decibyte Oct 2 '13 at 13:29
up vote 0 down vote accepted

As suggested by @FrankThomas, this was caused by a privacy extension called Priv3. I installed this a long time ago, and it doesn't seem to have been updated since then. Disabling this extension, everything is working again.

I also use Ghostery to block to block trackers these days, and I think it's doing a better job.

After a bit of investigation, I found out that Priv3 blocked cookies from when a tweet was embedded, like in this post. That's why I didn't have the problem all the time, but only when somebody posted a tweet in my stream. The subpage on Flattr suffering from this issue also contains an embedded tweet.

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