CleanteamofNY, do other system notifications close after 5 seconds? Have you tried the old method of changing a setting to something else and then changing it back? For example, you could change the timeout to 15 seconds, test to see if the Firefox notifications now respect this new setting, and if they do, then go and set the notification timeout back to 5 seconds. (Not sure if this is necessary, but you may possibly need to close both the Settings app and Firefox after each change, in order for the new timeout setting to take effect with Firefox?)