Oh sorry, I didn't get your explanations right. I see this is a problem without using a plugin, didn't understand before. In this case you're right, it's a Chrome issue. That's bad
Hopefully other browser won't do this, otherwise we're stuck with projects like MoodleBox. I'll check if there's some workaround (after the french MoodleMoot, since I'm quite busy now ).
Thanks for the clarification