Firefox 42: How to install unsigned addons on dev/nightly builds

While it's a major improvement on the more sluggy Firefox builds, it does however add a slight inconvenience for developers by restricting addon installations to signed ones. In my case, it was Firebug 3 alpha.

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If you find yourself needing to install an unsigned addon, you can quickly do so by:

  • Type "about:config" into your address bar
  • Confirm OK "I'll be safe"
  • Filter to find "xpinstall.signatures.required"
  • Double click it to set the value to "false"

You shouldn't need to restart for this to take effect. Try installing the addon again, it should work this time.

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Source

Fix for installing unsigned add-ons in Firefox Dev and Nightly

 
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