I had an issue where my website worked fine on all browsers except Firefox. This persisted for many updates of WeeWX, Belchertown skin, and Firefox.
Today, thanks to a kind soul, the issue is 'solved' It is because of a bug in mosquitto server and its interaction with the way Firefox gets the wss connection. See the info and the solution here: MQTT Connection Failure with Firefox <https://support.mozilla.org/en-US/questions/1324001> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/109b258b-ac8c-48d2-827e-dd1b3d749066n%40googlegroups.com.