We noticed some recent Firefox update has cause our self-hosted add-on (.xpi file) download to not trigger the installation. When clicking the .xpi link, user is prompt with the dialog attached below, which only has ‘open with’ and ‘save file’ options. And user has to download the file and drag/drop it into the browser to get it installed.
Can someone please answer why this is happening and what should I do to have the auto-triggered installation work like before.
Thanks.