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no, not at all... Maxthon will not prompt you to open any webpage if you set it as your default browser. do you know what UAC is ? https://en.wikipedia.org/wiki/User_Account_Control and file association ? http://windows.microsoft.com/en-us/windows/change-file-open-program#1TC=windows-7 as an example, if you don't set any browser to default, windows will ask you which application you want to open html files, and each time you will try to open an html file windows will prompt you again. Setting it as default will tell windows : always open those files with maxthon, don't ask me again.

Tested here with ABP and it worked fine. Only using the default easylist. If you're using extra ones, then they could be the cause. Try disabling them to see if that is the case.