We have tested and highly recommend following extensions for responsive Magento theme
- Free Magento extensions for responsive themes (1)
LightBox2 (fixed), EasyTabs (fixed), AW Blog , Captcha, ShareThis - Free Magento extensions for responsive themes (2)
MD Quick View (fixed), Search Autocomplete and Suggest, CartView, Quick Contact - Paid Magento extensions for responsive themes
QuickView by Temgra, Zopim Live Chat
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