It is usually not necessary to download Firefox add-ons manually from the Mozilla website. There are however situations where this may be your only course of action.
Maybe you want to install an add-on on a device without direct Internet connection, a development machine for example.
Security conscious users may want to download extensions too as it provides them with options to go through the source code before they install the add-on in the web browser.
And then there are situations where add-ons are not compatible with the version of the browser that you are using. It is often possible to modify the source of the extension to make it compatible.
When you visit the official Mozilla Add-ons repository you won't find direct download links listed on it.
That does not mean that there is none, only that it is not displayed directly on the page.
Here is what you need to do to download Firefox add-ons manually.
The context menu after a right-click on the Add to Firefox button
The download dialog for the add-on
Note: This works in all modern web browsers. When you use a different browser, a download button may be displayed directly instead which you can click on to initiate the download.
Mozilla displays a prompt then underneath the download button. Here you need to click on download anyway to download the extension to the system.
Now that you have downloaded the extension, you can install it directly in compatible versions of Firefox. It is alternatively possible to extract the xpi file to the system first. You can use a program such as 7-Zip for that.
Once done, you can edit the source code as you see fit or audit it.
To install the extension in Firefox, simply drag and drop the downloaded file on a Firefox window. The installation dialog opens up and you can install the add-on as usual.
If you do not like drag and drop, you can open about:addons alternatively, click on the "Tools for all addons" button at the top next to the search form, and select the "Install add-on from file" option that is displayed here.
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