diff --git a/background/index.html b/background/index.html
index 0458901..d34a8ea 100644
--- a/background/index.html
+++ b/background/index.html
@@ -7,4 +7,4 @@
   <script type="application/javascript" src="../config.js"></script>
   <script type="application/javascript" src="index.js"></script>
 </head>
-</html>
\ No newline at end of file
+</html>
diff --git a/background/index.js b/background/index.js
index 5e654e9..d2b9138 100644
--- a/background/index.js
+++ b/background/index.js
@@ -1,85 +1,85 @@
 const fetchJson = (url) => {
-  return fetch(url).then((response) => (response.json()));
+	return fetch(url).then((response) => (response.json()));
 };
 
 const fetchCalendar = (days = 28) => {
-  let url = Config.calenderUrl + '?o=json';
-  if (days) {
-    url += '&r=' + days;
-  }
-  return fetchJson(url);
+	let url = Config.calenderUrl + '?o=json';
+	if (days) {
+		url += '&r=' + days;
+	}
+	return fetchJson(url);
 };
 
 const fetchSpaceApi = () => {
-  return fetchJson(Config.spaceApiUrl);
+	return fetchJson(Config.spaceApiUrl);
 };
 
 const updateBadge = (open) => {
-  let badgeText, badgeColor;
-  if (open) {
-    badgeText = browser.browserAction.setBadgeText({text: 'open'});
-    badgeColor = browser.browserAction.setBadgeBackgroundColor({color: Config.openColor});
-  } else {
-    badgeText = browser.browserAction.setBadgeText({text: ''});
-    badgeColor = browser.browserAction.setBadgeBackgroundColor({color: null});
-  }
-  Promise.all([badgeText, badgeColor])
-    .then()
-    .catch((error) => {
-      console.error(error);
-    });
+	let badgeText, badgeColor;
+	if (open) {
+		badgeText = browser.browserAction.setBadgeText({text: 'open'});
+		badgeColor = browser.browserAction.setBadgeBackgroundColor({color: Config.openColor});
+	} else {
+		badgeText = browser.browserAction.setBadgeText({text: ''});
+		badgeColor = browser.browserAction.setBadgeBackgroundColor({color: null});
+	}
+	Promise.all([badgeText, badgeColor])
+		.then()
+		.catch((error) => {
+			console.error(error);
+		});
 };
 
 const sendNotification = (open) => {
-  browser.notifications.create('notification-id', {
-    type: 'basic',
-    iconUrl: browser.runtime.getURL('icons/logo.svg'),
-    title: 'Space Status',
-    message: 'Space ist jetzt ' + (open ? 'offen' : 'geschlossen') + '.'
-  });
+	browser.notifications.create('notification-id', {
+		type: 'basic',
+		iconUrl: browser.runtime.getURL('icons/logo.svg'),
+		title: 'Space Status',
+		message: 'Space ist jetzt ' + (open ? 'offen' : 'geschlossen') + '.'
+	});
 };
 
 const fetchNewData = () => {
-  fetchCalendar().then((json) => {
-    window.calendar = json;
-  }).catch((error) => {
-    console.error(error);
-  });
+	fetchCalendar().then((json) => {
+		window.calendar = json;
+	}).catch((error) => {
+		console.error(error);
+	});
 
-  fetchSpaceApi().then((json) => {
-    if (window.spaceApi && window.spaceApi.state.open !== json.state.open) {
-      sendNotification(json.state.open)
-    }
-    window.spaceApi = json;
-    updateBadge(window.spaceApi.state.open);
-  }).catch((error) => {
-    console.error(error);
-  });
+	fetchSpaceApi().then((json) => {
+		if (window.spaceApi && window.spaceApi.state.open !== json.state.open) {
+			sendNotification(json.state.open)
+		}
+		window.spaceApi = json;
+		updateBadge(window.spaceApi.state.open);
+	}).catch((error) => {
+		console.error(error);
+	});
 };
 
 let intervalHandler = null;
 
 const stopFetching = () => {
-  if (intervalHandler !== null) {
-    clearInterval(intervalHandler);
-    intervalHandler = null;
-  }
+	if (intervalHandler !== null) {
+		clearInterval(intervalHandler);
+		intervalHandler = null;
+	}
 };
 const startFetching = () => {
-  fetchNewData();
-  if (intervalHandler === null) {
-    intervalHandler = setInterval(() => {
-      fetchNewData();
-    }, Config.refreshTimeout);
-  }
+	fetchNewData();
+	if (intervalHandler === null) {
+		intervalHandler = setInterval(() => {
+			fetchNewData();
+		}, Config.refreshTimeout);
+	}
 };
 
 window.addEventListener('offline', () => {
-  stopFetching();
+	stopFetching();
 });
 window.addEventListener('online', () => {
-  startFetching();
+	startFetching();
 });
 if (window.navigator.onLine) {
-  startFetching();
+	startFetching();
 }
diff --git a/config.js b/config.js
index 4115d60..7aa1187 100644
--- a/config.js
+++ b/config.js
@@ -1,32 +1,32 @@
 window.Config = {
-  refreshTimeout: 1000 * 60 * 5, // 5min,
-  spaceApiUrl: 'https://www.usrspace.at/spaceapi.json',
-  calenderUrl: 'https://www.usrspace.at/calendar.php',
-  openColor: '#33cc33',
-  quickLinks: [
-    {
-      url: 'https://www.usrspace.at/',
-      img: 'icons/font-awesome/home-solid.svg',
-      alt: 'Home',
-      text: 'Homepage'
-    },
-    {
-      url: 'https://wiki.usrspace.at/',
-      img: 'icons/font-awesome/wikipedia-w-brands.svg',
-      alt: 'Wiki',
-      text: 'Wiki'
-    },
-    {
-      url: 'https://gitea.usrspace.at/',
-      img: 'icons/gitea-brands.svg',
-      alt: 'Gitea',
-      text: 'Gitea'
-    },
-    {
-      url: 'https://cloud.usrspace.at/',
-      img: 'icons/font-awesome/cloud-solid.svg',
-      alt: 'Cloud',
-      text: 'Nextcloud'
-    }
-  ]
+	refreshTimeout: 1000 * 60 * 5, // 5min,
+	spaceApiUrl: 'https://www.usrspace.at/spaceapi.json',
+	calenderUrl: 'https://www.usrspace.at/calendar.php',
+	openColor: '#33cc33',
+	quickLinks: [
+		{
+			url: 'https://www.usrspace.at/',
+			img: 'icons/font-awesome/home-solid.svg',
+			alt: 'Home',
+			text: 'Homepage'
+		},
+		{
+			url: 'https://wiki.usrspace.at/',
+			img: 'icons/font-awesome/wikipedia-w-brands.svg',
+			alt: 'Wiki',
+			text: 'Wiki'
+		},
+		{
+			url: 'https://gitea.usrspace.at/',
+			img: 'icons/gitea-brands.svg',
+			alt: 'Gitea',
+			text: 'Gitea'
+		},
+		{
+			url: 'https://cloud.usrspace.at/',
+			img: 'icons/font-awesome/cloud-solid.svg',
+			alt: 'Cloud',
+			text: 'Nextcloud'
+		}
+	]
 };
diff --git a/manifest.json b/manifest.json
index e3af4dd..fa9c32c 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,35 +1,35 @@
 {
-  "manifest_version": 2,
-  "name": "/usr/space",
-  "version": "0.6",
-  "description": "An Add-on for the Hacker-/Maker-Space /usr/space.",
-  "icons": {
-    "48": "icons/logo.svg",
-    "96": "icons/logo.svg"
-  },
-  "background": {
-    "page": "background/index.html"
-  },
-  "browser_action": {
-    "browser_style": true,
-    //"chrome_style": true,
-    "default_title": "/usr/space",
-    //"default_icon": "icons/logo.svg",
-    "default_icon": {
-      "16": "icons/logo.svg",
-      "32": "icons/logo.svg"
-    },
-    "default_area": "navbar",
-    "default_popup": "popup/index.html"
-  },
-  "permissions": [
-    "https://www.usrspace.at/*",
-    "webRequest",
-    "notifications"
-  ],
-  "author": "Thomas Rupprecht"
-  //"developer": {
-  //  "name": "Thomas Rupprecht",
-  //  "url": "https://blog.ximex.at/"
-  //}
+	"manifest_version": 2,
+	"name": "/usr/space",
+	"version": "0.6",
+	"description": "An Add-on for the Hacker-/Maker-Space /usr/space.",
+	"icons": {
+		"48": "icons/logo.svg",
+		"96": "icons/logo.svg"
+	},
+	"background": {
+		"page": "background/index.html"
+	},
+	"browser_action": {
+		"browser_style": true,
+		//"chrome_style": true,
+		"default_title": "/usr/space",
+		//"default_icon": "icons/logo.svg",
+		"default_icon": {
+			"16": "icons/logo.svg",
+			"32": "icons/logo.svg"
+		},
+		"default_area": "navbar",
+		"default_popup": "popup/index.html"
+	},
+	"permissions": [
+		"https://www.usrspace.at/*",
+		"webRequest",
+		"notifications"
+	],
+	"author": "Thomas Rupprecht"
+	//"developer": {
+	//  "name": "Thomas Rupprecht",
+	//  "url": "https://blog.ximex.at/"
+	//}
 }
diff --git a/popup/index.css b/popup/index.css
index 3581388..ba08a1a 100644
--- a/popup/index.css
+++ b/popup/index.css
@@ -1,52 +1,52 @@
 body {
-    width: 360px;
+	width: 360px;
 }
 
 h2 {
-    margin: 12px 8px 8px;
+	margin: 12px 8px 8px;
 }
 summary {
-    margin: 12px 8px 8px;
+	margin: 12px 8px 8px;
 }
 summary > h2 {
-    margin: 0;
-    display: inline-block;
+	margin: 0;
+	display: inline-block;
 }
 
 .panel-list-item > .icon {
-    text-align: center;
-    width: 23px;
-    margin-right: 4px;
+	text-align: center;
+	width: 23px;
+	margin-right: 4px;
 }
 .panel-list-item > .icon > img {
-    vertical-align: text-bottom;
+	vertical-align: text-bottom;
 }
 
 #state {
-    margin: 0 8px;
+	margin: 0 8px;
 }
 #state > img {
-    vertical-align: text-bottom;
-    margin-right: 4px;
+	vertical-align: text-bottom;
+	margin-right: 4px;
 }
 
 #calendar {
-    margin: 0 8px;
+	margin: 0 8px;
 }
 #calendar > div > img {
-    vertical-align: text-bottom;
-    margin-right: 4px;
+	vertical-align: text-bottom;
+	margin-right: 4px;
 }
 
 #space-api {
-    margin: 0;
-    padding: 0 8px;
-    height: 240px;
-    overflow-x: hidden;
-    overflow-y: scroll;
-    background-color: #ebebeb;
+	margin: 0;
+	padding: 0 8px;
+	height: 240px;
+	overflow-x: hidden;
+	overflow-y: scroll;
+	background-color: #ebebeb;
 }
 #space-api code {
-    font-family: monospace;
-    font-size: 10px;
+	font-family: monospace;
+	font-size: 10px;
 }
diff --git a/popup/index.html b/popup/index.html
index 9e3a94f..2de4255 100644
--- a/popup/index.html
+++ b/popup/index.html
@@ -1,57 +1,57 @@
 <!DOCTYPE html>
 <html lang="de">
 <head>
-  <meta charset="utf-8">
-  <title>/usr/space</title>
-  <link rel="stylesheet" href="index.css" />
+	<meta charset="utf-8">
+	<title>/usr/space</title>
+	<link rel="stylesheet" href="index.css" />
 </head>
 <body>
-  <!--<header class="panel-section panel-section-header">
-    <div class="icon-section-header"><img src="../icons/logo.svg" width="32" height="32" alt="/usr/space" /></div>
-    <div class="text-section-header">/usr/space</div>
-  </header>-->
-  <section>
-    <h2>Aktueller Status</h2>
-    <div id="state">loading...</div>
-  </section>
-  <section>
-    <h2>Links</h2>
-    <div class="panel-section panel-section-list">
-      <div class="panel-list-item link" data-url="https://www.usrspace.at/">
-        <div class="icon"><img src="../icons/font-awesome/home-solid.svg" width="19" height="19" alt="Home" /></div>
-        <div class="text">Homepage</div>
-        <div class="text-shortcut"></div>
-      </div>
-      <div class="panel-list-item link" data-url="https://wiki.usrspace.at/">
-        <div class="icon"><img src="../icons/font-awesome/wikipedia-w-brands.svg" width="19" height="19" alt="Wiki" /></div>
-        <div class="text">Wiki</div>
-        <div class="text-shortcut"></div>
-      </div>
-      <div class="panel-list-item link" data-url="https://gitea.usrspace.at/">
-        <div class="icon"><img src="../icons/gitea-brands.svg" width="19" height="19" alt="Gitea" /></div>
-        <div class="text">Gitea</div>
-        <div class="text-shortcut"></div>
-      </div>
-      <div class="panel-list-item link" data-url="https://cloud.usrspace.at/">
-        <div class="icon"><img src="../icons/font-awesome/cloud-solid.svg" width="19" height="19" alt="Cloud" /></div>
-        <div class="text">Nextcloud</div>
-        <div class="text-shortcut"></div>
-      </div>
-    </div>
-  </section>
-  <section>
-    <h2>Nächster Termin</h2>
-    <div id="calendar">loading...</div>
-  </section>
-  <section>
-    <details>
-      <summary><h2>SpaceApi JSON</h2></summary>
-      <pre id="space-api"><code>loading...</code></pre>
-    </details>
-  </section>
+	<!--<header class="panel-section panel-section-header">
+		<div class="icon-section-header"><img src="../icons/logo.svg" width="32" height="32" alt="/usr/space" /></div>
+		<div class="text-section-header">/usr/space</div>
+	</header>-->
+	<section>
+		<h2>Aktueller Status</h2>
+		<div id="state">loading...</div>
+	</section>
+	<section>
+		<h2>Links</h2>
+		<div class="panel-section panel-section-list">
+			<div class="panel-list-item link" data-url="https://www.usrspace.at/">
+				<div class="icon"><img src="../icons/font-awesome/home-solid.svg" width="19" height="19" alt="Home" /></div>
+				<div class="text">Homepage</div>
+				<div class="text-shortcut"></div>
+			</div>
+			<div class="panel-list-item link" data-url="https://wiki.usrspace.at/">
+				<div class="icon"><img src="../icons/font-awesome/wikipedia-w-brands.svg" width="19" height="19" alt="Wiki" /></div>
+				<div class="text">Wiki</div>
+				<div class="text-shortcut"></div>
+			</div>
+			<div class="panel-list-item link" data-url="https://gitea.usrspace.at/">
+				<div class="icon"><img src="../icons/gitea-brands.svg" width="19" height="19" alt="Gitea" /></div>
+				<div class="text">Gitea</div>
+				<div class="text-shortcut"></div>
+			</div>
+			<div class="panel-list-item link" data-url="https://cloud.usrspace.at/">
+				<div class="icon"><img src="../icons/font-awesome/cloud-solid.svg" width="19" height="19" alt="Cloud" /></div>
+				<div class="text">Nextcloud</div>
+				<div class="text-shortcut"></div>
+			</div>
+		</div>
+	</section>
+	<section>
+		<h2>Nächster Termin</h2>
+		<div id="calendar">loading...</div>
+	</section>
+	<section>
+		<details>
+			<summary><h2>SpaceApi JSON</h2></summary>
+			<pre id="space-api"><code>loading...</code></pre>
+		</details>
+	</section>
 
-  <script type="application/javascript" src="../browser-polyfill.js"></script>
-  <script type="application/javascript" src="../config.js"></script>
-  <script type="application/javascript" src="index.js"></script>
+	<script type="application/javascript" src="../browser-polyfill.js"></script>
+	<script type="application/javascript" src="../config.js"></script>
+	<script type="application/javascript" src="index.js"></script>
 </body>
 </html>
diff --git a/popup/index.js b/popup/index.js
index 9b97493..e24caa6 100644
--- a/popup/index.js
+++ b/popup/index.js
@@ -1,77 +1,77 @@
 Array.from(document.getElementsByClassName('link')).forEach((element) => {
-  element.addEventListener('click', (event) => {
-    const newTab = browser.tabs.create({
-      url: event.currentTarget.dataset.url
-    });
-    newTab.then((data) => {
-      // console.log(data);
-    }).catch((error) => {
-      console.error(error);
-    });
-  });
+	element.addEventListener('click', (event) => {
+		const newTab = browser.tabs.create({
+			url: event.currentTarget.dataset.url
+		});
+		newTab.then((data) => {
+			// console.log(data);
+		}).catch((error) => {
+			console.error(error);
+		});
+	});
 });
 
 browser.runtime.getBackgroundPage().then((page) => {
-  updateNextEvent(page.calendar);
-  updateSpaceApiJson(page.spaceApi);
-  updateState(page.spaceApi);
+	updateNextEvent(page.calendar);
+	updateSpaceApiJson(page.spaceApi);
+	updateState(page.spaceApi);
 }).catch((error) => {
-  console.error(error);
+	console.error(error);
 });
 
 const updateNextEvent = (nextEvents) => {
-  const calendarElement = document.getElementById('calendar');
-  calendarElement.innerText = '';
+	const calendarElement = document.getElementById('calendar');
+	calendarElement.innerText = '';
 
-  if (nextEvents.length === 0) {
-    const hintNode = document.createTextNode('Keine Termine in den nächsten 4 Wochen!');
-    const strongElement = document.createElement('strong');
-    strongElement.append(hintNode);
-    calendarElement.append(strongElement);
-    return;
-  }
+	if (nextEvents.length === 0) {
+		const hintNode = document.createTextNode('Keine Termine in den nächsten 4 Wochen!');
+		const strongElement = document.createElement('strong');
+		strongElement.append(hintNode);
+		calendarElement.append(strongElement);
+		return;
+	}
 
-  const nextEventDate = nextEvents[0].begin.substr(0, 10);
-  const nextEventDateEvents = nextEvents.filter((nextEvent) => (nextEvent.begin.startsWith(nextEventDate)));
+	const nextEventDate = nextEvents[0].begin.substr(0, 10);
+	const nextEventDateEvents = nextEvents.filter((nextEvent) => (nextEvent.begin.startsWith(nextEventDate)));
 
-  nextEventDateEvents.forEach((nextEventDateEvent) => {
-    const divElement = document.createElement('div');
-    divElement.innerHTML = '<img src="../icons/font-awesome/clock-regular.svg" width="19" height="19" alt="Clock" />';
-    const beginDate = new Date(nextEventDateEvent.begin);
-    const strongElement = document.createElement('strong');
-    const timeElement = document.createElement('time');
-    strongElement.textContent = nextEventDateEvent.name;
-    timeElement.datetime = beginDate.toISOString();
-    const dateNode = document.createTextNode(beginDate.toLocaleString());
-    // divElement.innerText = '';
-    divElement.append(strongElement);
-    divElement.append(document.createTextNode(' '));
-    divElement.append(timeElement);
-    timeElement.append(dateNode);
-    if (nextEventDateEvent.location) {
-      const locationNode = document.createTextNode(' (' + nextEventDateEvent.location + ')');
-      divElement.append(locationNode);
-    }
-    calendarElement.append(divElement);
-  });
+	nextEventDateEvents.forEach((nextEventDateEvent) => {
+		const divElement = document.createElement('div');
+		divElement.innerHTML = '<img src="../icons/font-awesome/clock-regular.svg" width="19" height="19" alt="Clock" />';
+		const beginDate = new Date(nextEventDateEvent.begin);
+		const strongElement = document.createElement('strong');
+		const timeElement = document.createElement('time');
+		strongElement.textContent = nextEventDateEvent.name;
+		timeElement.datetime = beginDate.toISOString();
+		const dateNode = document.createTextNode(beginDate.toLocaleString());
+		// divElement.innerText = '';
+		divElement.append(strongElement);
+		divElement.append(document.createTextNode(' '));
+		divElement.append(timeElement);
+		timeElement.append(dateNode);
+		if (nextEventDateEvent.location) {
+			const locationNode = document.createTextNode(' (' + nextEventDateEvent.location + ')');
+			divElement.append(locationNode);
+		}
+		calendarElement.append(divElement);
+	});
 };
 
 const updateSpaceApiJson = (spaceApi) => {
-  const spaceApiElement = document.querySelector('#space-api code');
-  const json = JSON.stringify(spaceApi, null, 2).replace(/ /g, '&nbsp;').replace(/\n/g, '<br/>');
-  spaceApiElement.innerHTML = json;
-  // const jsonNode = document.createTextNode(json);
-  // spaceApiElement.innerText = '';
-  // spaceApiElement.append(jsonNode);
+	const spaceApiElement = document.querySelector('#space-api code');
+	const json = JSON.stringify(spaceApi, null, 2).replace(/ /g, '&nbsp;').replace(/\n/g, '<br/>');
+	spaceApiElement.innerHTML = json;
+	// const jsonNode = document.createTextNode(json);
+	// spaceApiElement.innerText = '';
+	// spaceApiElement.append(jsonNode);
 };
 
 const updateState = (spaceApi) => {
-  const stateElement = document.getElementById('state');
-  const since = new Date(spaceApi.state.lastchange * 1000);
-  const sinceStr = ' seit <time datetime="' + since.toISOString() + '">' + since.toLocaleString() + '</time>';
-  if (spaceApi.state.open) {
-    stateElement.innerHTML = '<img src="../icons/font-awesome/lock-open-solid.svg" width="19" height="19" alt="Offen" />Offen' + sinceStr;
-  } else {
-    stateElement.innerHTML = '<img src="../icons/font-awesome/lock-solid.svg" width="19" height="19" alt="Geschlossen" />Geschlossen' + sinceStr;
-  }
+	const stateElement = document.getElementById('state');
+	const since = new Date(spaceApi.state.lastchange * 1000);
+	const sinceStr = ' seit <time datetime="' + since.toISOString() + '">' + since.toLocaleString() + '</time>';
+	if (spaceApi.state.open) {
+		stateElement.innerHTML = '<img src="../icons/font-awesome/lock-open-solid.svg" width="19" height="19" alt="Offen" />Offen' + sinceStr;
+	} else {
+		stateElement.innerHTML = '<img src="../icons/font-awesome/lock-solid.svg" width="19" height="19" alt="Geschlossen" />Geschlossen' + sinceStr;
+	}
 };