附加组件
要尝试这里成千上万的附加组件，下载 Mozilla Firefox，一个快速、自由的上网工具！
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![[警告]](https://addons.thunderbird.net/static/img/developers/test-warning.png?b=58a99cbb-667a0970)
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关于这个附加组件
Expiry Canary will tell you if the certificate of the website you are visiting is about to expire. By default it gives 7 days warning for all sites, but you can configure the warning period and the sites it works on. It is expected to be useful to admins who want a backstop to their certificate renewal procedure, to prevent embarrassing accidents.
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.
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.
