Here is a related issue that I came across:
With the assistance of OffBySome, I managed to display my FB.ui dialog boxes in an iframe rather than as pop-ups. However, now I am experiencing an issue where the dialog appears but the loading throbber continues indefinitely. Is anyone else encountering this problem as mentioned in these posts, or is there something additional I need to do to ensure the FB.ui dialogs function correctly? Thank you.
UPDATE I would like to mention that upon further investigation, it was discovered that the issue was not with Facebook. It appears that there was an incorrect setting in my Firefox profile, which was causing the problem. Resetting the profile resolved the issue.