You can read this: https://developer.mozilla.org/en/XPCOM/XPCOM_changes_in_Gecko_2.0 https://developer.mozilla.org/en/XPCOM/XPCOM_changes_in_Geck... Overall,

You can read this: https://developer.mozilla.org/en/XPCOM/XPCOM_changes_in_Gecko_2.0 https://developer.mozilla.org/en/XPCOM/XPCOM_changes_in_Geck... Overall, the changes are great and a long-time coming. As someone who embeds Gecko as a foundational technology for our application, the changes have been pretty bumpy as of late. Next year, I'm hoping the codebase will stabilize. I'm especially looking forward to the new single-HWND rendering code: http://weblogs.mozillazine.org/roc/archives/2010/10/bye_bye_hwnds.html http://weblogs.mozillazine.org/roc/archives/2010/10/bye_bye_...