Here we offer Maxthon Extension Development Guide and Package Tool (for Maxthon3 and Maxthon Cloud Browser). The English SDK is here Update date：May 21th, 2015 SDK runtime version：1.0.6 SDK document version：1.2.7 Mx-Extension-SDK.zip Update: 1.2.7: update stopOnClose 1.2.6: add contextmenu api add resize api add toolbar support 1.2.3: Update the description of def.json 1.2.2: Describe the objects that runtime.post support to post 1.2.1: The included JS File's format must be UTF