How do I uninstall Dephormation?
Use the Tools/Add-Ons dialog. Select Dephormation and click uninstall. This removes the Dephormation Add-On from your current Firefox profile. Your opt out cookie/Phorm UID cookies will be unaffected. Assuming default settings, you will remain opted out (unless your cookies are deleted) but your UID will become static (because it is not being randomised by Dephormation). If you choose not to use Dephormation, you should opt out using your ISPs mechanism, or switch to a Phorm free ISP. See here for recommendations.