Puzzling Firefox warning

lethedoom's picture
Submitted by lethedoom on Wed, 08/12/2015 - 00:56

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Puzzling Firefox warning

After updating x-notifier on Firefox 40.0 the Add-on list contained a warning:
X-notifier could not be verified for use in Firefox. Proceed with caution.

On the explanation page it states:

https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_...

Where would I encounter unsigned add-ons?
Add-ons installed through the official Firefox Add-ons site undergo a rigorous review process before they are published. These add-ons are signed and verified.
When you install an add-on through another website, Firefox checks to make sure that the add-on has been digitally signed before you can install it.

X-notifier 3.5.12 is on the official site:

https://addons.mozilla.org/en-US/firefox/addon/xnotifier/?src=cb-dl-updated

X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) 3.5.12
by Byungwook Kang
Notifier for gmail, yahoo, hotmail, aol and more webmails.
X-notifier(aka WebMail Notifier) checks your webmail accounts and notifies the number of unread emails...
Supports : gmail, yahoo, hotmail, POP3/IMAP, facebook, twitter and more

Another explanation site offers no further explanation:

https://developer.mozilla.org/en-US/Add-ons/Add-on_guidelines

jeroen's picture

jeroen

Wed, 08/12/2015 - 02:19

The message is displayed for add-ons that are not properly signed when boolean xpinstall.signatures.required in about:config is set to false. When set to true the add-on will be blocked.
See https://bugzilla.mozilla.org/show_bug.cgi?id=1149702

I have 7 other add-ons that now show that warning (I have only 1 of them enabled). So either those add-ons are not properly signed by the add-on developer and Firefox 40.0 is now enforcing this or this is a sloppy bug in Firefox 40.0, in which case we will soon see the 40.1 update.

RpD

Wed, 08/12/2015 - 05:38

Using Win10, I was on FF 39.0.3 and installed the X-N 3.5.12 update... no warning. 
Then I updated FF to 40.0, it checked add-ons during restart... no alerts, but the add-ons list has the warning (also for Skype click-to-call.)