Find unused css [duplicate]

Question

I'm doing some development for some pages on our internal network. I want to know if there's an open source tool or FF plugin which can identify unused css within a project.

I've looked at using this, but when I try to install the Add-on Installer says "Not compatible with Firefox 3.6"

https://addons.mozilla.org/en-US/firefox/addon/dust-me-selectors/

Please note, this is for an intranet - not a www visible website - so I can't use the online sites which offer such services.

Answer 1

Google Chrome (and therefore probably Safari as well) have the developer tools installed, which come with Audits. When you audit the page, the unused CSS rules is one thing it checks.

Here's what it looks like on this page.

Answer 2

I've been looking for a while, and the best thing I found was this:

http://unused-css.com/

They scan your site and email you the result css.

I am aware you are working on a localsite, however if you find no alternative, you can upload your site somewhere and use this

Alternatively

You could install a previous version of firefox that is compatible with dust-me selectors and run it along side your current installation of firefox.