Toolbar won't install from web

[lwoolard]

I have Toolbar Studio v 4.1.0.41 and the Firefox converter 2.12.38. I have created a toolbar with no update URL and the check for updates box unchecked. I've run it through the Firefox converter. When I just navigate to the .xpi file inside of Firefox the toolbar installs. When I put the install.html and .xpi file on a server and browse to the location on the server I get this error message when I click on the Install Now button. Firefox could not install the file because: Download error -228. I can install an IE version of the toolbar from the same server.

Why won't the toolbar install from the web?

[Admin]

Is your .xpi accessible from the server ?

Please, check the settings of .xpi file on your server to be readable for all users. The URL to your .xpi should be accessible.
You may also add MIME TYPE ON IIS http Headers like:

extension: .xpi
MIME TYPE: application/x-xpinstall

[lwoolard]

Installing the MIME type took care of it. Thanks.