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How do I get Readability back on firefox?

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When I upgraded to version 43, I lost Readability? How do I get it back.

When I upgraded to version 43, I lost Readability? How do I get it back.

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Addons that are not signed have been disabled in the latest version of Firefox for security purposes. To enable this addon again, please do the following:

  1. Type about:config in the address bar
  2. Click the I'll be careful button
  3. Locate the xpinstall.signatures.required boolean
  4. Change the value on this preference to false

Note: You may need to restart Firefox in order for the changes to take effect.

Warning: Doing the above steps may present a security threat. Please use with caution and at your own risk.

For more information about addon signing, please refer to this Mozilla support article.