I disabled all plugins ...it will open a pop window to 'Open with' Citrix Receiver (default). And yes - it will open our apps now. So now..... Either firefox or citrix needs to adapt. Please fix so that I don't have to disable the app plugins for 200+ users. Thanks

Same problem. After the 30 upgrade, logging into the SaaS provider from my work laptop and clicking the provided link to initiate Citrix, nothing happens. Citrix doesn't start. Do I really have to go through the downgrade uninstall / install 29 to get Firefox working again>

This problem has been reported in Bugzilla and occurs on Windows, Mac and Linux platforms. With the update to FF 30, the plugin manager changed such that most or all plugins including Citrix now default to "Ask to Activate" mode. This means that when you click on your Citrix App, an alert should show up on the notification bar asking if it's okay to proceed. For some reason this doesn't happen on Citrix App pages. The cleanest solution that I've seen it to set the Citrix plugin to "Always Activate" behavior. To do this, open the Add-ons manager (Ctrl-Shift-A or type about:addons in the address bar or choose Add-ons from the menu). Then click Plug-ins to make modifications.