Залил код

SfeduHelper/grade.js

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+if (document.getElementById('signoauthin_b')) {
+    document.getElementById('signoauthin_b').addEventListener('click', function () {
+        if (document.getElementById("loginoauth").value.toLowerCase().match(/^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|.(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
+        )) {
+            chrome.storage.local.set({ "email": document.getElementById("loginoauth").value }, function () {
+                console.log('Email сохранен');
+            });
+        } else {
+            console.log("Не удалось сохранить email");
+        }
+    });
+
+    chrome.storage.local.get(["email"], function (items) {
+        if (items["email"] != undefined && document.getElementById("loginoauth").value == "") {
+            document.getElementById("loginoauth").value = items["email"];
+        }
+    });
+}

SfeduHelper/icons/trash.svg

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+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+
<!-- Uploaded to: SVG Repo, www.svgrepo.com, Transformed by: SVG Repo Mixer Tools -->
+<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+
<g id="SVGRepo_bgCarrier" stroke-width="0"/>
+
<g id="SVGRepo_tracerCarrier" stroke-linecap="round" stroke-linejoin="round"/>
+
<g id="SVGRepo_iconCarrier"> <path d="M20.5001 6H3.5" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round"/> <path d="M18.8332 8.5L18.3732 15.3991C18.1962 18.054 18.1077 19.3815 17.2427 20.1907C16.3777 21 15.0473 21 12.3865 21H11.6132C8.95235 21 7.62195 21 6.75694 20.1907C5.89194 19.3815 5.80344 18.054 5.62644 15.3991L5.1665 8.5" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round"/> <path d="M9.5 11L10 16" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round"/> <path d="M14.5 11L14 16" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round"/> <path d="M6.5 6C6.55588 6 6.58382 6 6.60915 5.99936C7.43259 5.97849 8.15902 5.45491 8.43922 4.68032C8.44784 4.65649 8.45667 4.62999 8.47434 4.57697L8.57143 4.28571C8.65431 4.03708 8.69575 3.91276 8.75071 3.8072C8.97001 3.38607 9.37574 3.09364 9.84461 3.01877C9.96213 3 10.0932 3 10.3553 3H13.6447C13.9068 3 14.0379 3 14.1554 3.01877C14.6243 3.09364 15.03 3.38607 15.2493 3.8072C15.3043 3.91276 15.3457 4.03708 15.4286 4.28571L15.5257 4.57697C15.5433 4.62992 15.5522 4.65651 15.5608 4.68032C15.841 5.45491 16.5674 5.97849 17.3909 5.99936C17.4162 6 17.4441 6 17.5 6" stroke="#ffffff" stroke-width="1.5"/> </g>
+
</svg>

SfeduHelper/manifest.json

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+{
+  "name": "Sfedu Helper",
+  "description": "Расширение для упрощения работы с сайтами Sfedu",
+  "version": "1.0",
+  "manifest_version": 3,
+  "icons": {
+    "64": "icons/iconEn64.png",
+    "128": "icons/iconEn128.png"
+  },
+  "action": {
+    "default_popup": "popup.html"
+  },
+  "permissions": [
+    "storage",
+    "activeTab",
+    "tabs"
+  ],
+  "content_scripts": [
+    {
+      "matches": [
+        "https://grade.sfedu.ru/", "https://grade.sfedu.ru/sign"
+      ],
+      "js": [
+        "grade.js"
+      ]
+    }
+  ],
+  "background": {
+    "service_worker": "service_worker.js",
+    "type": "module"
+  }
+}

SfeduHelper/popup.css

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+body {
+    width: 200px;
+    height: 150px;
+}
+
+h1 {
+    text-align: center;
+}
+
+#main {
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+}
+
+#clearBtn {
+    color: white;
+    background-color: #4272e1;
+    width: 80%;
+    height: 35px;
+    margin-bottom: 10px;
+    border-radius: 20px;
+    border: none;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
+#clearBtn:hover {
+    background-color: #003ece;
+}
+
+img {
+    width: 20px;
+    height: 20px;
+    margin-right: 5px;
+}
+
+#version {
+    color: gray;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
+.notif {
+    position: fixed;
+    left: 15px;
+    bottom: -50px;
+    padding: 8px 15px 8px 15px;
+    vertical-align: middle;
+    color: #fff;
+    background-color: #38bc73;
+    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
+    border-radius: 20px;
+    font-family: "Trebuchet MS", Helvetica, sans-serif;
+}
+
+.peek {
+    -webkit-animation: peek 2.5s forwards;
+    animation: peek 2.5s forwards;
+}
+
+@-webkit-keyframes peek {
+    0% {
+        bottom: -50px;
+    }
+
+    20% {
+        bottom: 15px;
+    }
+
+    90% {
+        bottom: 15px;
+    }
+
+    100% {
+        bottom: -50px;
+    }
+}
+
+@keyframes peek {
+    0% {
+        bottom: -90px;
+    }
+
+    20% {
+        bottom: 15px;
+    }
+
+    90% {
+        bottom: 15px;
+    }
+
+    100% {
+        bottom: -50px;
+    }
+}

SfeduHelper/popup.html

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+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8">
+    <title>Sfedu Helper</title>
+    <link rel="stylesheet" type="text/css" href="popup.css" />
+    <script src="popup.js"></script>
+</head>
+
+<body>
+    <div id="main">
+        <h1><b style="color: #FF4534;">Sfedu</b> <b style="color: #0033AB;">Helper</b></h1>
+        <button id="clearBtn"><img src="icons/trash.svg" />Очистить данные</button>
+        <p id="version">V 1.0.0</p>
+    </div>
+    <div id="popup"></div>
+</body>
+
+</html>

SfeduHelper/popup.js

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+document.addEventListener('DOMContentLoaded', function() {
+    var checkButton = document.getElementById('clearBtn');
+    checkButton.addEventListener('click', function() {
+        chrome.storage.local.clear(function () {
+            var popup = document.getElementById("popup");
+            popup.innerHTML = "<div class=\"notif peek\">OK</div>";
+        });
+     
+    }, false);
+  }, false);

SfeduHelper/service_worker.js

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+chrome.tabs.onUpdated.addListener(function (tabId, changeInfo, tab) {
+    // Получить URL текущей вкладки
+    var url = tab.url;
+    var manifestData = chrome.runtime.getManifest();
+    var enabled = false;
+    manifestData.content_scripts[0].matches.forEach((element) => {
+        console.log(element + " " + url.includes(element));
+        enabled = url.includes(element)
+    });
+    if (enabled) {
+        chrome.action.setIcon({ path: {
+            "64" : "icons/iconEn64.png",
+            "128" : "icons/iconEn128.png" 
+        }, tabId: tabId });
+        // Установить обработчик клика по иконке
+        chrome.action.onClicked.addListener(function (tab) {
+            // Выполнить какое-то действие при клике
+        });
+    } else {
+        chrome.action.setIcon({ path: {
+             "64" : "icons/iconDis64.png",
+             "128" : "icons/iconDis128.png"
+            }, tabId: tabId });
+        // Установить обработчик клика по иконке
+        chrome.action.onClicked.addListener(function (tab) {
+            // Показать alert при клике
+            alert("This extension is not available for this page");
+        });
+    }
+});