<div>
I seems the problem was an extension. Anytime my Mac goes to sleep with Thunderbird running and the Lightning extension installed, Thunderbird comes out of &quot;sleep&quot; &quot;not responding&quot;. I uninstalled Lightning and the problem went away. Since I want to use Lightning, I quit out of Thunderbird before closing my Mac and putting it to &quot;sleep&quot;.
</div>


I seems the problem was an extension. Anytime my Mac goes to sleep with Thunderbird running and the Lightning extension installed, Thunderbird comes out of "sleep" "not responding". I uninstalled Lightning and the problem went away. Since I want to use Lightning, I quit out of Thunderbird before closing my Mac and putting it to "sleep".

<div>
I followed your suggestion about uninstalling extensions and found that it was the Lightning extension that was causing the problem. Thanks for the tip.
</div>


I followed your suggestion about uninstalling extensions and found that it was the Lightning extension that was causing the problem. Thanks for the tip.

<div>
<div class="content wysiwyg-content">
Thunderbird &quot;stops responding&quot; at least one a day. &nbsp;I can't say that I've seen a pattern as to when it happens. I'm at a loss to explain it and have not been able to find a reference to this problem anywhere else. &nbsp;The only way out have have at this point is to &quot;force quit&quot; the app. I'm running OS X 15.5.5 on a MacBook Pro with Thunderbird 2.0.0.17.
</div>
</div>


Thunderbird "stops responding" at least one a day.  I can't say that I've seen a pattern as to when it happens. I'm at a loss to explain it and have not been able to find a reference to this problem anywhere else.  The only way out have have at this point is to "force quit" the app. I'm running OS X 15.5.5 on a MacBook Pro with Thunderbird 2.0.0.17.

thunderbird not responding os x

Thunderbird is an email, newsgroup, news feed, and chat (XMPP, IRC, Twitter) client that supports POP and IMAP and LDAP address completion. The vanilla version is not a personal information manager, although the Mozilla Lightning extension adds PIM functionality. Thunderbird can manage multiple email, newsgroup, and news feed accounts and supports multiple identities within accounts. Features such as quick search, saved search folders, advanced message filtering, message grouping, and labels help manage and find messages. Thunderbird incorporates a Bayesian spam filter, a whitelist based on the included address book, and can also understand classifications by server-based filters such as SpamAssassin. Extensions allow the addition of features.