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Expiry Canary 1.1.1-signed.1-signed Requires Restart
An extension to warn about nearly-expired website SSL certificates.
This simple addon probably needs updating for the upcoming changes in Firefox; however, I'm afraid I don't have time to learn the new stuff. If you can maintain it, contact me!
About this Add-on
You can use the preference "extensions.canary.warningPeriod" to change the warning period in days (default 7), and set "extensions.canary.sites" to a space-separated list of sites or domains to restrict Expiry Canary to warning you on those sites only.