Anyway this seems to work in Chrome and FF , copy it into your Free Nodelet Settings and after clicking the link all modules after use or require are underlined and have an onclick event to call CPAN in a _blank window.

This is beta-code, no guaranties whatsover! =)

<!-- =================================================================
+=====================
 
    Auto-Linkify Modules in Code Sections  
    Version 0.31.03
    2022-07-23 
    https://perlmonks.org/?node_id=11145662

-->
<script>
// <!--

function show_module(module) {
    let url = 'https://perldoc.perl.org/' + module;
    window.open(url,'_blank');
}

function link_modules() {
    let codes = document.getElementsByClassName('codetext');

    let replacer = function (match, p1, p2, p3) {
        return p1 + '<u><span onclick="show_module(\'' + p3 +' \')">' 
++ p3 + '</span></u>';
    };

    for (var i in codes) {
        if (!codes.hasOwnProperty(i)) continue;
        let text = codes[i];
        let inner = text.innerHTML;
        inner = inner.replace(/((use|require)\s+)((\w+)(::\w+)*)/g, re
+placer);
        // console.log(inner);
        text.innerHTML = inner;
    }
}      

/* Automatic linking */
link_modules();  // comment out if you prefer button only

// -->
</script>

<!-- Explict button in the Free Nodelet ... remove if automatic linkin
+g is enough -->
<button onclick='link_modules()'>link_modules() [id://11145662|v0.31.3
+]</button>


<!-- END Auto-Linkify Modules in Code Sections -----------------------
+------------------ -->
[download]

to do

• better identifier parsing then just \w+
• delay link_CPAN to window.onload or similar for automatic linking
• make target window configurable
• hide functions in own namespace / object
• make it easily importable like the wikisyntax hack
• detect core modules and link to perldoc instead(?) °,²
• exclude embedded package names (?)

changes

• updated to v0.3, transformation happens now automatically
• ²) 2022-07-23 v0.31 https://perldoc.perl.org/MODUL is already redirecting to MetaCPAN so no need to check corelist

updates

• °) here the output from corelist for v5.32.0