#!/usr/bin/perl
use strict;
use warnings;

my $folder = $ARGV[0];
my $url  = $ARGV[1];

(my $descr = $folder) =~ s/_+/ /g;
my $longname = 'Perl genarated extension - '.$descr;

mkdir $folder or die "Cannot create $folder: $!";
chdir $folder or die "Cannot enter $folder: $!";
# the manifest
open MANIF, '>', 'manifest.json' or die "Cannot open a file to write i
+n: $!";
my $manifest = '{
   "manifest_version": 3,
   "description": "'.$descr.'",
   "background": {
    "service_worker": "background.js"},
   "name": "'.$longname.'",
   "permissions": [ "contextMenus", "tabs" ],
   "version": "1.0"
}';
print MANIF $manifest;
close MANIF;
# the jscript
open JSCRIPT, '>', 'background.js' or die "Cannot open a file to write
+ in: $!";
my $background = 'chrome.runtime.onInstalled.addListener(function() {
    chrome.contextMenus.create({
        title: "'.$descr.'",
        contexts: ["selection"],
        id: "'.$descr.'"
    });
});

chrome.contextMenus.onClicked.addListener(function (info, tab) {
    if (info.menuItemId === "'.$descr.'") {
        let getToSite = "'.$url.'" + info.selectionText
        chrome.tabs.create({index: tab.index + 1, url: getToSite, sele
+cted: true});
    }
})';

print JSCRIPT $background;
close JSCRIPT;
[download]

here the diff output from the original 9 years old code:

16c16
<    "manifest_version": 2,
---
>    "manifest_version": 3,
19c19
<     "scripts": ["background.js"]},
---
>     "service_worker": "background.js"},
28,33c28,42
< my $background ='function customfunc(info)
< {
<  var searchstring = info.selectionText;
<  chrome.tabs.create({url: "'.$url.'" + searchstring})
< }
< chrome.contextMenus.create({title: "'.$descr.'", contexts:["selectio
+n"], onclick: customfunc});';
---
> my $background = 'chrome.runtime.onInstalled.addListener(function() 
+{
>     chrome.contextMenus.create({
>         title: "'.$descr.'",
>         contexts: ["selection"],
>         id: "'.$descr.'"
>     });
> });
>
> chrome.contextMenus.onClicked.addListener(function (info, tab) {
>     if (info.menuItemId === "'.$descr.'") {
>         let getToSite = "'.$url.'" + info.selectionText
>         chrome.tabs.create({index: tab.index + 1, url: getToSite, se
+lected: true});
>     }
> })';
>
[download]

see you in 2032 :)

L*

UPDATE If you want to add the website icon to the context menu you can download it (generally available under the root of the site like in: hhtps://example.com/favicon.ico ), transform it to a .png file (not rename; transform) and add it to the manifest.json file, after the version like in:

{
   "manifest_version": 3,
   "description": "Description",
   "background": {
    "service_worker": "background.js"},
   "name": "Perl genarated extension - Description",
   "permissions": [ "contextMenus", "tabs" ],
   "version": "1.0",
      
    "icons": {
      "128": "favicon.png",
      "16": "favicon.png",
      "32": "favicon.png",
      "48": "favicon.png",
      "64": "favicon.png"
   }
}
[download]