Installing an Add-on in Thunderbird

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  • Creator: Zenos
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How to Install Add-on Extension:

The ideal case

In an ideal world, all the add-ons you would want are officially vetted, approved, and can be found on the official website, .

If you are in this category, you can simply go to the Add-ons manager tab in Thunderbird, using the toolbar entry New Fx Menu then Thunderbird app menu >add-ons and click on the Extensions menu on the left to display the search box on the top right of the tab. Enter the add-on's name or enough of it to limit the search results returned to a manageable number and press enter.

Once you have done your first search a new category of Search appears on the menu to the left and you can keep refining your search until you find what you want.

Here is a search for Add-ons that mention "Contacts": Addon tab

Once you locate an add-on you like, click on Install, wait for it to be downloaded, then click on Restart Thunderbird if prompted.

A slightly less ideal case (Install from a downloaded XPI)

You may have been given an URL for the add-on, or the add-on you want isn't on the "official" page. Searching for it, as shown above, doesn't locate the add-on.

Visit the webpage in your browser, right-click the download link with your mouse, select "save link as", and save the XPI file to a location on your computer that you can find again. As the download is temporary it is suggested you use either your downloads folder or your desktop.

If you are using older versions of Firefox, a left-click on the download link will see your browser try and install the add-on into itself. This invariably results in an error about compatibility as the add-on is for Thunderbird. If you're using another browser, a left-click might result in your browser attempting to download and "open" the xpi file. This is basically a small program, so it is not meant to be opened. It has to be saved to disk

To install a downloaded XPI file into Thunderbird you have two options.


Right-click the link and select Save As or Save Link As as discussed earlier.

You will be invited to download and save the file. Most browsers have a default download location, often your Desktop. Make a note of where it downloads to, and what it's called. Some add-on files have silly names like “latest-234.xpi” which is not very helpful when you're trying to find it later on.

Open the Add-ons window in Thunderbird. There's a button to the left of the search window. CogWheelLinux Click this and from the subsequent menu select Install Add-on From File.


You will need to navigate in the file picker to where you saved the XPI file and select it to complete the install.


  • Open the add-ons manager ( New Fx Menu then appmenuAddons )
  • Drag your downloaded XPI file to the add-on manager tab and drop it.

If you are using Windows, you can even skip the desktop bit. Open your browser and Thunderbird side by side, with Thunderbird's Add-ons tab displayed. Drag the link directly from the browser onto Thunderbird's Add-on tab. The main advantage of this method is that you don't need to actually save a copy of the add-on on your hard disk before it is installed.