Installing an Add-on in Thunderbird
How to Install Add-on Extension:
Table of Contents
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, Addons.mozilla.org .
If you are in this category, you can simply go to the Add-ons manager tab in Thunderbird, using the toolbar entry then and enter the add-on's name into the search box.
Here is a search for Add-ons that mention "Contacts":
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 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.
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. 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 ( then )
- 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.