diff --git a/ChemistrySearchExtension/Swifterhtmler/README.md b/ChemistrySearchExtension/Swifterhtmler/README.md
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+
+# Chemistry molecular mass calculator
+
+This is chrome extension that helps users check the molacular mass of inputed element from periodic table.
+
+The extension is activated via:
+
+```bash
+Alt + U
+```
+
+or 
+
+```bash
+command + U
+```
+
+
+
+## Installation
+
+```bash
+
+git clone https://github.com/thinkswell/javascript-mini-projects.git
+cd ChemistrySearchExtension/Swifterhtmler/
+```
+
+## Demo
+
+![alt text](image.png)
+
+
+
+## Authors
+
+- [@Swifterhtmler](https://github.com/Swifterhtmler)
+
+## Notes
+
+
+!! important, the extension currently only works in finnish, but you can modify and translate as you wish !!
+
diff --git a/ChemistrySearchExtension/Swifterhtmler/app.js b/ChemistrySearchExtension/Swifterhtmler/app.js
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+++ b/ChemistrySearchExtension/Swifterhtmler/app.js
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+const result = document.getElementById('result');
+
+
+document.addEventListener('DOMContentLoaded', function () {
+    // Set a small delay to ensure focus is applied after the DOM is fully rendered
+    setTimeout(function() {
+        document.getElementById('searchField').focus();
+    }, 110);
+});
+
+
+if (searchField.value === '') {
+    result.innerHTML = '';
+}
+
+searchField.addEventListener('input', function () {
+    const inputValue = searchField.value.trim();
+
+  
+    if (inputValue === '') {
+        result.innerHTML = '';
+        return result;     
+    }  
+
+
+let matchedElement = null;
+
+
+
+// Check if the input matches the beginning of any element in the periodic table
+for (const element in periodicTable) {
+    if (element.startsWith(inputValue)) {
+        matchedElement = element;
+        break;
+    }
+}
+
+if (matchedElement) {
+    const molarMass = periodicTable[matchedElement];
+    result.innerHTML = `${matchedElement} moolimassa on: ${molarMass} g /mol`;
+
+    navigator.clipboard.writeText(molarMass.toString() + " \\frac{g}{mol} ").then(function () {
+       // console.log('Molar mass copied to clipboard:', molarMass);
+    }).catch(function (error) {
+        console.error('Clipboard write failed:', error);
+    });
+
+
+
+} else {
+    result.innerHTML = `Alkuainetta "${inputValue}" ei löytynyt`;
+ }
+
+});
+
+
+
+
+const periodicTable = {
+    vety: 1.008,
+    helium: 4.0026,
+    lithium: 6.94,
+    beryllium: 9.0122,
+    boori: 10.81,
+    hiili: 12.011,
+    typpi: 14.007,
+    happi: 16.00,
+    fluori: 18.998,
+    neon: 20.180,
+    natrium: 22.990,
+    magnesium: 24.305,
+    alumiini: 26.982,
+    pii: 28.085,
+    fosfori: 30.974,
+    rikki: 32.06,
+    kloori: 35.45,
+    argon: 39.948,
+    kalium: 39.098,
+    kalsium: 40.078,
+    skandium: 44.956,
+    titaani: 47.867,
+    vanadiini: 50.942,
+    kromi: 51.996,
+    mangaani: 54.938,
+    rauta: 55.85,
+    koboltti: 58.933,
+    nikkeli: 58.693,
+    kupari: 63.546,
+    sinkki: 65.38,
+    gallium: 69.723,
+    germanium: 72.630,
+    arseeni: 74.922,
+    seleeni: 78.971,
+    bromi: 79.904,
+    krypton: 83.798,
+    rubidium: 85.468,
+    strontium: 87.62,
+    yttrium: 88.906,
+    zirkonium: 91.224,
+    niobi: 92.906,
+    molybdeeni: 95.95,
+    teknetium: 98,
+    ruthenium: 101.07,
+    rodium: 102.91,
+    palladium: 106.42,
+    hopea: 107.87,
+    kadmium: 112.41,
+    indium: 114.82,
+    tina: 118.71,
+    antimonio: 121.76,
+    telluuri: 127.60,
+    jodi: 126.90,
+    ksenon: 131.29,
+    seesium: 132.91,
+    baarium: 137.33,
+    lantaani: 138.91,
+    cerium: 140.12,
+    praseodyymi: 140.91,
+    neodyymi: 144.24,
+    prometium: 145,
+    samarium: 150.36,
+    europium: 151.96,
+    gadolinium: 157.25,
+    terbium: 158.93,
+    dysprosium: 162.50,
+    holmium: 164.93,
+    erbium: 167.26,
+    tulium: 168.93,
+    ytterbium: 173.04,
+    luteettium: 174.97,
+    hafnium: 178.49,
+    tantaali: 180.95,
+    volframi: 183.84,
+    renium: 186.21,
+    osmium: 190.23,
+    iridium: 192.22,
+    platina: 195.08,
+    kulta: 196.97,
+    elohopea: 200.59,
+    tallium: 204.38,
+    lyijy: 207.2,
+    vismutti: 208.98,
+    polonium: 209,
+    astatine: 210,
+    radon: 222,
+    francium: 223,
+    radium: 226,
+    aktinium: 227,
+    torium: 232.04,
+    protaktinium: 231.04,
+    uraani: 238.03,
+    neptunium: 237,
+    plutonium: 244,
+    amerikium: 243,
+    kurium: 247,
+    berkelium: 247,
+    kalifornium: 251,
+    einsteinium: 252,
+    fermium: 257,
+    mendelevium: 258,
+    nobelium: 259,
+    lawrencium: 262,
+    rutherfordium: 267,
+    dubnium: 270,
+    seaborgium: 271,
+    bohrium: 270,
+    hassium: 277,
+    meitnerium: 276,
+    darmstadtium: 281,
+    roentgenium: 280,
+    copernicium: 285,
+    nihonium: 284,
+    flerovium: 289,
+    moscovium: 288,
+    livermorium: 293,
+    tennessine: 294,
+    oganessoni: 294,
+  };
+
+
diff --git a/ChemistrySearchExtension/Swifterhtmler/background.js b/ChemistrySearchExtension/Swifterhtmler/background.js
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+chrome.commands.onCommand.addListener(function (command) {
+    if (command === "openPopup") {
+      const popupURL = chrome.extension.getURL('popup.html');
+      chrome.windows.create({
+        url: popupURL,
+        type: 'popup', // This should open it as a browser popup
+        width: 500,
+        height: 180,
+      });
+    }
+  });
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diff --git a/ChemistrySearchExtension/Swifterhtmler/image.png b/ChemistrySearchExtension/Swifterhtmler/image.png
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diff --git a/ChemistrySearchExtension/Swifterhtmler/manifest.json b/ChemistrySearchExtension/Swifterhtmler/manifest.json
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+++ b/ChemistrySearchExtension/Swifterhtmler/manifest.json
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+{
+    "manifest_version": 2,
+    "name": "Chemistry Extension",
+    "version": "1.3",
+    "permissions": [
+      "activeTab",
+      "tabs",
+      "storage",
+      "clipboardWrite"
+
+    ],
+    "commands": {
+      "openPopup": {
+        "suggested_key": {
+          "default": "Alt+U",
+          "mac": "Command+U"
+        },
+        "description": "Opens Popup"
+      }
+    },
+    "background": {
+      "scripts": ["background.js"],
+      "persistent": false
+    },
+    "browser_action": {
+      "default_popup": "popup.html"
+    }
+  }
+  
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diff --git a/ChemistrySearchExtension/Swifterhtmler/popup.html b/ChemistrySearchExtension/Swifterhtmler/popup.html
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+++ b/ChemistrySearchExtension/Swifterhtmler/popup.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+     <title>Chemistry extension</title>
+    <link rel="stylesheet" href="styles.css" >
+</head>
+<body>
+    
+
+<div id="content"> 
+<input type="text" id="searchField">
+
+
+<br>
+
+<h1 id="result"></h1>
+</div>
+
+
+<script src="app.js"></script>
+
+
+
+
+</body>
+</html>
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diff --git a/ChemistrySearchExtension/Swifterhtmler/styles.css b/ChemistrySearchExtension/Swifterhtmler/styles.css
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+++ b/ChemistrySearchExtension/Swifterhtmler/styles.css
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+body {
+    background-color: rgb(rgb(198, 214, 205), green, blue);
+    width: 200px;
+    max-width: 500px;
+}
+
+#content {
+    display: grid;
+    place-items: center;
+}
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