Issues (in the latest version)
Clicking on the "Earned badge XXX" elements lead to a non-existing page:
Clicking in the popup box always opens a new tab. Instead, it should check if the is a tab with the same Discourse instance opened already and updates the tab's URL instead.
As a minimum thing, you should use some target per-discourse-website, so that every time I click on a link in your notification plugin, it opens in the same tab rather than in a new tab.
"Badge earned" notifications still blue after clicking on them: