I just noticed that the bookmark button didn’t work for me on firefox, seems to work fine on chrome. When pressed there is no popup for the “Create Bookmark” settings, and after moving to a new post there is an error popup saying “Sorry, an error has occurred.” It does however seem to have added the bookmark even though I didn’t get the popup for settings. Same thing happens when I want to remove bookmarks, though the bookmark doesn’t disappear so have to switch to chrome to do that…
Tried two other discourse forums where it worked fine, and didn’t find anything that seemed relevant with a quick search.