Information:

• Prism version: 1.27 downloaded from prismjs.com
• Plugins: Copy to Clipboard + Toolbar (and also Command line, Line numbers, Show invisibles and Keep markup)
• Environment: Browser

Description
I have updated prism.js from version 1.25 into 1.27 (with Copy to Clipboard plugin) and prism does not work properly now.
The html source code of my pages is like this:

<div class="codigo">
        <pre>
<code class="language-python">import webbrowser

If I use the prism version 1.25 I downloaded last September, this code is shown in the Firefox code inspector like this:

<div class="codigo">
    <div class="code-toolbar">
        <pre class="language-python" tabindex="0">
<code class="language-python">import webbrowser

But if I use prism version 1.27, this code is shown in the Firefox code inspector like this:

<div class="codigo">
    <div class="code-toolbar">
        <pre class="language-none" tabindex="0">
<code class="language-python language-none">import webbrowser

I you need aditional information or file samples, please ask for them and I would provide them the best I can.

Thanking you in advance,
Bartolome Sintes