Neither will Firefox 41, but this can be disabled via a special feature in the about:config settings page
Mozilla has announced that, starting with Firefox 42, the installation of unsigned extensions will be not allowed anymore, due to security-related concerns.
Signed extensions are Firefox add-ons that have been checked and approved by Mozilla's automated extensions verification system, or by one of its human reviewers.
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Firefox 42 Will Not Allow the Installation of Unsigned Extensions
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Good timing - ? was just asking me about this as he was getting a warning message about the Webroot extensions.
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