How to disable "allow xxx to run 'microsoft office'"?

Question

I have a publishing site on SP 2013. When viewed with Firefox, users get a message:

Allow site.xzy.com to run "Microsoft Office?

How do I disable this?

I thought this was the "client integration" setting, and have already disabled that, but the message still appears.

edit: as noted below, I want to disable this so it doesn't appear for any users. It's a publishing site, and users will not be interacting with office docs of any kind.

Answer 1

Got it. Add the following script to the head to override the functions that add the activex:

//get rid of name.dll reference 
function ProcessImn() { }
function ProcessImnMarkers() { }

source: http://www.greggalipeau.com/sharepoint-public-facing-remove-plugin-prompt/

Answer 2

Activate the plugin from the browser's plugin settings. Use Always Activate option. There's a similar thread on MSDN with a picture.