Rated 5 out of 5 stars

help!!!
https:addons.mozilla.org/zh-cn/firefox/downloads/file/90928/flashgot-1.2.1.23-fx+mz+sm+tb.xpi?src=api&confinrmed=1,
error:down error
-228
what should ido?

This review is for a previous version of the add-on (1.2.1.23). 

This usually means Mozilla's mirrors are not all in sync yet.
You may want to install manually from the direct link at http://flashgot.net/getit#direct