hello-worldproject folder for our extension and navigate to it.
manifest.jsonfile that tells Thunderbird a few basic information about the add-on. Let's place the following
manifest.jsonfile directly in the
browser_action. That is the button we want to add to Thunderbird's main toolbar. The reference to a browser in its name is inherited from the Firefox Browser.
browser_actionis defined in the
browser_action.default_popupkey. Let's create a
mainPopupdirectory in the
hello-worldproject folder for everything related to that popup and start with the following
popup.css. This is just for decoration of the page, we'll put it in the same folder as the
popup.jsand place it in the same folder as the
manifest.jsonfile from within our
console.log(), so we need to open the error console first, in order to see those log entries. Hit the "Inspect" button under the add-on's listing (pictured above), this will bring up the Developer Tools tab.
xpifile extension. That file can be installed from the gear menu in the Thunderbird Add-Ons Manager.