I shall install later today.

Thank you! show less

I am not seeing any errors, but I do assume that is the issue. I am running Windows 7 (64bit) and Firefox 55.0.3 (32bit) on both desktops where I am having the issue. Again, icons/buttons work fine in other browsers whether on these same desktops or other systems.

Update: I tried on an older version of IE (8) and was able to see the JS errors caused by Jomsocial. These were the two offending files:

com_community/assets/release_32/js/bundle.js
com_community/assets/release/js/loader.js

However, I disabled the extensions that load those files but there is no change in FF. show less

Thanks for the advice on the Facebook app. I have just tested with multiple browsers here as well. The Facebook/Manual popups are still not working in FF but it is working in other browsers. Perhaps I can work that issue out on my own. Thank you. show less

I have updated the original post with info you requested. I have also reinstalled Parainvite with default settings. Thank you. show less