Centos – Mime type received as “text/html”, server configured to send as “text/javascript”

Both firefox and chrome are showing that javascript files from my server are served as MIME type text/html. The javascript files have a .js extension.

First, mime_module is installed and active:

apachectl -M | grep mime
 mime_magic_module (shared)
 mime_module (shared)
Syntax OK

Second, I have this in my conf file:

AddType text/css .css
AddType text/javascript .js

I tried adding this:

<Files "*.js">
    ForceType text/javascript
</Files>

and restarted apache, but the javascript files still show as "text/html" in Chrome and Firefox. Nothing shows in error.log and access.log isn't returning anything useful:

1.2.3.4 - - [03/Mar/2015:10:42:00 -0500] "GET /some/dir/js/app-min.js HTTP/1.1" 200 14642

Here are headers on one of the .js files (as seen in Firefox)

Connection: close
Content-Type: text/html; charset=UTF-8
Server: Apache
Strict-Transport-Security: max-age=63072000; includeSubDomains
Transfer-Encoding: chunked
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-Permitted-Cross-Domain-Policies: master-only
X-WebKit-CSP: default-src 'self'
X-XSS-Protection: 1; mode=block

This file shows as type html in Firefox inspector.

Here's the header of the same file as served by my laptop's apache instance:

Connection: Keep-Alive
Date: Tue, 03 Mar 2015 15:43:52 GMT
Keep-Alive: timeout=5, max=95
Server: Apache/2.4.7 (Ubuntu)

This file shows as type js in Firefox inspector. Note that the local instance of Apache (2.4) is not responding with Content-Type.

Why is the main server defying AddType? I've added this to both the httpd.conf and ssl.conf (though my site forces 443). I've restarted apache (no syntax errors).