closureinspector09.xpi has mime-type text/html but should be application/x-xpinstall

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Click the closureinspector09.xpi link
   http://closure-inspector.googlecode.com/files/closureinspector09.xpi
2. Firefox asks to save the file.
3. It should ask to install it.

What is the expected output? What do you see instead?
FIrefox's add-on install window should appear.

What version of the product are you using? On what operating system?
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.7)
Gecko/20091221 Firefox/3.5.7 GTB6

Please provide any additional information below.
n/a

Original issue reported on code.google.com by [email protected] on 31 Jan 2010 at 6:40