I've just made version 2.0.20 of the CCK2 available. It contains the following changes:

• Multiple CCK2s can now coexist
• Rework of how Hidden UI works, including hiding UI on chrome pages (about:addons)
• Can completely disable Firefox Health Report
• Add the ability to disable the extension compatibility check at startup
• Add support for adding security devices
• Add the ability to disable search plugin installs from web pages and the search menu
• Add a tooltip to the menu that shows the ID and version of a config
• Disable the Firefox Refresh button on webpages
• Bug Fix: Hiding help menu items didn't remove them from the help popup in the Firefox menu
• Bug Fix: Autoconfig only, sometimes extensions wouldn't install
• Bug Fix: Sometimes telemetry prefs didn't migrate correctly from old CCK
• Bug Fix: Default browser error on Mac OS X Yosemite
• Bug Fix: CCK2 Wizard didn't work on Firefox menu
• Bug Fix: Adding Extensions with international characters in their install.rdf didn't work

If you find bugs, please report them at cck2.freshdesk.com.

Priority support is given to folks with support subscriptions. If the CCK2 is important to your company, please consider purchasing one.

http://mike.kaply.com/2015/02/13/cck2-2-0-20-available/