Hi Nicolas, sorry to tell you but the customizer still freezes using safari (10.0.2) under MacOs 10.10.5 using Hueman 3.3.2 and addons 2.0.4. I don’t have the Links widget (whatever that was!). It’s not a major problem because the customizer works using Firefox (50.1.0) under MacOs. The situation has been the same (safari no, firefox yes) since 3.3.0. Btw the ability to apply different design options to different parts of the site is brilliant!