How to switch language? Rated 5 out of 5 stars

Hi Dr. S,
It automatically switches to the Chinese language in the 1.1.3 version.I prefer to use English as user interface. I cannot find the language setting in preference, could you show me how to do it? Thanks!
BTW, drag selected text as gesture doesn't work after using a while. It works in the beginning of open the browser.

This review is for a previous version of the add-on (1.1.3.1-signed).