Installing an Add-on in Thunderbird

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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, .

For those in this category,You simply go to the Add-ons manager tab in Thunderbird, using the toolbar entry New Fx Menu then Thunderbird app menu >add-ons and enter the add-on's name into the search box.

Here is a search for Add-ons that mention contats: 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

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 your addo-on.

Visit the webpage in your browser, and left click the download link with your mouse and select "save link as". and save the XPI file to a location on your computer that your can find it 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 compatability 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, as this is basically a small program, it is not meant to be opened. It has to be saved to disk

To install a downloaded XPI file into Thunderbird you really 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 ponderously unhelpful 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 following menu select Install Add-on From File.


You will need to navigate to where you saved the XPI file in the file picker 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.