无法将JQuery导入chrome扩展

我正在尝试将以下功能添加到chrome扩展程序中:

$( function() {
    var availableTags = [
      "ActionScript",
      "JavaScript",
      "Lisp",
      "Perl",
      "PHP",
      "Python",
      "Ruby",
      "Scala",
      "Scheme"
    ];
    $( "#other" ).autocomplete( {
      source: availableTags,
      minLength: 0
    })
    .focus(function() {
        $(this).autocomplete('search', $(this).val())
    })
    ;
  } );

但是我不断收到错误:

counterstring.js:7 Uncaught (in promise) ReferenceError: $ is not defined
    at show_options (VM182 counterstring.js:7)
    at VM182 counterstring.js:81
    at Array.forEach (<anonymous>)
    at VM182 counterstring.js:78

我已经下载了:

jquery-3.5.1.min.js

From the site: https://code.jquery.com/jquery/

并将清单文件和HTML代码添加为:

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>jQuery UI Autocomplete - Default functionality</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <script src="js/jquery-3.5.1.min.js"></script>
<script>
  </script>
</head>
<body>

"background": {
    "persistent": true,
    "scripts": ["js/background.js","js/jquery-3.5.1.min.js"], 
    "matches": [ "http://*/*", "https://*/*"]
  },

但我不断收到同样的错误

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