Linux, FF 36.0.1
Steps to reproduce: Unknown.
I was browsing my own (paltry) User:Contributions, and accidentally moused over an article name. To my surprise, the popup would not go away. I clicked everywhere on the page, etc, and the only way to destroy the popup was to reload the page.
Observed behavior on http://reading-web-staging.wmflabs.org/wiki/Category:Popups_corpus
- Hover on any card
- Click on article (do not open in new tab)
- Select "back"
- Hovercard still open