Middle clicking (to open in a new tab) on a topic triggers Firefox’s pop-up blocker.
This doesn’t make sense to me, given that middle clicking on an ordinary link opens in a new tab without this. Is discourse intercepting middle-clicks somehow?
Right-clicking on the link (if you aim VERY carefully), and selecting “Open in new tab” works as expected, but this is a pain compared to the much-easier-to-execute middle click.
Edit: You don’t actually have to aim carefully to right-click on the link, you have to right-click twice. The first right-click acts as if you’d right-clicked on the page, and the second one as if you’d right-clicked a link. Right-clicking before middle-clicking also works. This is really weird.