Class not applying to multiple elements in Firefox

Hey, I'm creating a website for the first time since frames and tables went out of fashion, and am using CSS to style my html.

I am running into a funny browser compatibility problem that I haven't been able to find an answer to online:

In my style sheet, I made a psuedo-class to use on links that I wanted to look different from the others on the site:

a.s:link {
 font-size: .8em;

I then apply it like this:

<a class="s" href="url.html">LINK</a>

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