Can not access Extension Manager

Dear Sir, I want to access Extension Manager to install some extension, however, an error happens:

Operating system: Mac High Seria 10.13.6
Slicer version: Slicer-4.11.0-2020-07-20-macosx-amd64
Expected behavior: access the extension manager
Actual behavior: can not access the extension manager, have a warning: There is not an application to open URL data:text/html ; charset=UTF-8 , %3Cstyle%20type%3D%27text%2Fcss%27%3E%20%20div.viewWrapperSlicer%7B%20%20%20%20font-

Thank you!