Firefox 43 requires signed Appendix

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So long one can bypass this if they want to. When Firefox is updated, it is often a few additions that are not turned on. After a time as updated extensions and then it works as it should. Firefox 43 requires signed add-ins and then can be even longer until extensions updated. In the meantime, you can turn off the requirement for signed Appendix.

What to do when Firefox 43 requires signed Appendix

1. Go to: about:config
2. Locate the string: xpinstall.signatures.required
3. Change the value to: false

Added the ability to enable unsigned add-ins.