As you might be knowing, Mozilla was going to remove the option xpinstall.signatures.required from about:config in Firefox 44. Once this option would have been removed, the user would have been unable to bypass the digital signature enforcement for add-ons. Mozilla has changed their mind and decided to keep the option till the Firefox 46 release.
Tag: Disable add-on signing
Enable unsigned add-ons disabled by Firefox 43
As I installed Firefox 43 on all my PCs, it disabled some add-ons on my laptop. This is because of the new requirement that all addons be signed by Mozilla. If any of your favorite add-ons stopped working because of this signature enforcement added to Firefox 43, here is what you can do.
Disable add-on signing requirement in Mozilla Firefox
If you use the Nightly builds of Mozilla Firefox or read Winaero regularly, you might be knowing that Mozilla has introduced add-on signature verification in Firefox Nightly v40. Firefox 40 will reach the stable channel very soon, so you might be interested in disabling this add-ons signing requirement.