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Showing content from https://support.mozilla.org/en-US/kb/thunderbird-add-ons-frequently-asked-questions below:

Thunderbird add-ons - frequently asked questions

Add-ons are extensions and other additions that add new functionality to Thunderbird or change its appearance. Thunderbird has an open, extensible design and program architecture. This enables people to create “add-ons” to Thunderbird.

Add-ons are mostly created by volunteer authors, typically not the developers of Thunderbird. Thunderbird hosts a site for the distribution of add-ons, but Thunderbird is not responsible for supporting add-ons. If you need help with an add-on, you should contact the author of the add-on.

The Add-ons Manager is the central interface to list, update, enable, disable, remove and install add-ons. To open the Add-ons Manager, click the menu button and click .

The Add-ons Manager has multiple panels:

•  : List of popular and recommended add-ons.
•  : List of installed extensions (add-ons adding functionality to Thunderbird).
•  : List of installed themes (add-ons changing the appearance of Thunderbird).

Most Thunderbird add-ons are distributed via the Thunderbird add-ons site (although authors can distribute their add-ons any way they choose). You can search and browse the add-ons site using a web browser. You can also open the Add-ons Manager and search for add-ons by typing search terms into the search field in the top right corner, or browser the list of recommended add-ons in the panel.

1. Open the Add-ons Manager.
2. Switch to the or panel.

See Installing an Add-on in Thunderbird

1. Open the Add-ons Manager.
2. Switch to the panel to see all installed extensions (only extensions can be configured).
   • If the add-on provides an options page, the extension entry will have a wrench icon.
3. Click the wrench icon to view or change option settings for the extension.

The standard update behavior can be changed by toggling the setting in the menu behind the gear icon of the Add-ons Manager.

The update behavior of each add-on can also be set individually:

1. Open the Add-ons Manager.
2. Switch to the or panel.
3. Click on the name of an add-on to open its management page.
4. Scroll to the entry and select On or Off instead of Default.

1. Open the Add-ons Manager.
2. Switch to the or panel.
3. Click on the gear icon at the top-right corner and then select .
4. The 3-dot-icon of all add-ons which could be updated, will show a small blue dot.
5. Click on the 3-dot-icon and then select .

If you updated to a newer version of Thunderbird or are using the beta version of Thunderbird and an add-on is not working or won't install, it is possible that the add-on author does not support that version of Thunderbird and you can contact the author as described below. But it is also possible that the add-on has been abandoned by the author. Thunderbird will inform you whether it is potentially abandoned (defined as not having been updated within the past year), and also whether an alternative add-on is available. You can also use the standalone, web based version of the Extension Finder tool to find alternative add-ons.

Contact the add-on author for support as documented on the add-on's management page.

1. Open the Add-ons Manager.
2. Switch to the or panel.
3. Click on the name of the broken add-on.
4. Open the manage information.
5. In the details tab scroll to and open the entry.
6. The add-on's home page will have a support website and/or support e-mail.

1. Open the Add-ons Manager.
2. Switch to the or panel.
3. Toggle the slider on the right side of the add-on's entry to disable the add-on and to prevent it from loading.

Before uninstalling an add-on, make sure to have backuped all data related to that add-on. All data stored by add-ons will be deleted upon add-on removal.

1. Open the Add-ons Manager.
2. Switch to the or panel.
3. Click on the 3-dot-icon and then select .

The add-on manager will show an button at the top to restore the add-on (including its data). Once the add-on manager is closed, the add-on has been removed permanently.

You may find information on Thunderbird Add-on development on developer.thunderbird.net (DTN).

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