Earlier this year Firefox announced that they would start blocking cookies from third-party ad networks by default.
The update to the FireFox browser will allow sites that you’ve visited (first parties) to set cookies on your system, but it will block cookies from third parties, such as advertising networks, unless they already have a cookie on your machine.
Originally scheduled to take effect in Firefox 22, which will be released in June 2013, the change has been delayed, but it’s still something that affiliate marketers need to keep an eye on.
Webgains has announced that due to their Device Tracking technology this change will not impact any of their publishers or advertisers, as long as a few basic guidelines are followed.
In the case of advertisers, if they don’t have any kind of additional tracking logic or conditions in place that determine when to execute the Webgains tracking code, they don’t need to do anything.
And Webgains publishers are in good shape if the advertisers they promote are not using any additional tracking logic or conditions.
More details on how Webgains is handling the issue on their blog: Webgains responds to Firefox 22 and Third Party Cookie Blocking