Just go to manage extentsion and allow it to run on website. then it work well. Thank you the maker of this addon

Come on people, just go to manage extension > Allow run on sites with restrictions.
I have never had an issue, but Firefox focuses way more on privacy than Chrome so keep that in mind, works great.
I am really greatfull for Evernote supporting the Firefox Addon, that's why I love Evernote.
Hopefully they launch a Linux desktop app :)

国内小伙伴登录扩展时无法跳转到国内印象的，试试看火狐浏览器语言设置为中文，然后重启浏览器。还不行的试试7.26.3版本，以及windows语言也设置为中文。