What happened with Gmail? Rated 5 out of 5 stars

What happened with Gmail?
I have try to do the best to enable popup for gmail open a link in a mail. But it always warning:
"Grrr! A popup blocker may be preventing Gmail from opening the page. If you have a popup blocker, try disabling it to open the window."

This review is for a previous version of the add-on (0.3.7.3).