Thunderbird 3 has introduced several major changes to the popular email client. The ability to perform global email searches for instance was a feature that was missing in Thunderbird 2.
Extension developers have also added several interesting add-ons for the email client including the previously reviewed Sender Verification extension.
Quick Filter is another extension for Thunderbird 3 that adds email filtering capabilities to the web browser. The extension adds a small toolbar on top of the email column in the software program that can be used to filter the emails of the active folder in Thunderbird.

Five permanent filter options are displayed in the toolbar plus a text form to filter the emails by name.
The permanent filter options are there to display only unread or starred emails, emails send by contacts, emails by tag or emails with attachments. These email filters can be combined with the text filter to quickly find specific emails in the active folder.
The extension searches in the sender, recipients and subject header by default with the option to add the body text to search the email body as well. These filters can be configured as needed, it is for instance possible to only search in email bodies or by sender.
Another interesting option provided by the email filtering extension is the ability to make the filter settings permanent so that they are applied to other folders the user switches to. This can be enabled or disabled in the toolbar as well.
Quick Filter is a very handy extension for the Thunderbird email client that is most useful to filter emails in large mail folders.
The extension has now been integrated into Thunderbird 3 and therefor removed from the add-on repository.
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Thank you! By setting a filter to automatically star all new mail, I can use this extension to “archive in place” by unstarring messages that I’m done with. Excellent!