diff --git a/.eslintrc.json b/.eslintrc.json
index 35b72d8..c9ed8da 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -22,6 +22,11 @@
     },
     "sourceType": "module"
   },
+  "settings": {
+    "react": {
+      "version": "detect"
+    }
+  },
   "rules": {
     "strict": 0,
     "semi": ["error", "never"],
diff --git a/src/js/api/Client.js b/src/js/api/Client.js
index 7545a5b..c35e59f 100644
--- a/src/js/api/Client.js
+++ b/src/js/api/Client.js
@@ -3,19 +3,15 @@ import { formatDate } from "utils"
 
 const baseURL = subdomain => {
   if (process.env.NODE_ENV === "production") {
-    return `https://${encodeURIComponent(
-      subdomain
-    )}.mocoapp.com/api/browser_extensions`
+    return `https://${encodeURIComponent(subdomain)}.mocoapp.com/api/browser_extensions`
   } else {
-    return `http://${encodeURIComponent(
-      subdomain
-    )}.mocoapp.localhost:3001/api/browser_extensions`
+    return `http://${encodeURIComponent(subdomain)}.mocoapp.localhost:3001/api/browser_extensions`
   }
 }
 
 export default class Client {
-  #client;
-  #apiKey;
+  #client
+  #apiKey
 
   constructor({ subdomain, apiKey, version }) {
     this.#apiKey = apiKey
@@ -25,9 +21,9 @@ export default class Client {
       headers: {
         common: {
           "x-api-key": apiKey,
-          "x-extension-version": version
-        }
-      }
+          "x-extension-version": version,
+        },
+      },
     })
   }
 
@@ -35,29 +31,29 @@ export default class Client {
     this.#client.post("session", {
       api_key: this.#apiKey,
       remote_service: service?.name,
-      remote_id: service?.id
-    });
+      remote_id: service?.id,
+    })
 
-  projects = () => this.#client.get("projects");
+  projects = () => this.#client.get("projects")
 
   schedules = (fromDate, toDate) =>
     this.#client.get("schedules", {
-      params: { date: `${formatDate(fromDate)}:${formatDate(toDate)}` }
-    });
+      params: { date: `${formatDate(fromDate)}:${formatDate(toDate)}` },
+    })
 
   activities = (fromDate, toDate) =>
     this.#client.get("activities", {
-      params: { date: `${formatDate(fromDate)}:${formatDate(toDate)}` }
-    });
+      params: { date: `${formatDate(fromDate)}:${formatDate(toDate)}` },
+    })
 
   bookedHours = service => {
     if (!service) {
       return Promise.resolve({ data: { hours: 0 } })
     }
     return this.#client.get("activities/tags", {
-      params: { selection: [service.id], remote_service: service.name }
+      params: { selection: [service.id], remote_service: service.name },
     })
-  };
+  }
 
-  createActivity = activity => this.#client.post("activities", { activity });
+  createActivity = activity => this.#client.post("activities", { activity })
 }
diff --git a/src/js/components/Calendar/Day.js b/src/js/components/Calendar/Day.js
index 1e9afa7..ac62a7f 100644
--- a/src/js/components/Calendar/Day.js
+++ b/src/js/components/Calendar/Day.js
@@ -10,15 +10,11 @@ const Day = ({ date, hours, absence, active, onClick }) => {
 
   return (
     <div
-      className={cn(
-        "moco-bx-calendar__day",
-        `moco-bx-calendar__day--week-day-${getDay(date)}`,
-        {
-          "moco-bx-calendar__day--active": active,
-          "moco-bx-calendar__day--filled": hours > 0,
-          "moco-bx-calendar__day--absence": absence
-        }
-      )}
+      className={cn("moco-bx-calendar__day", `moco-bx-calendar__day--week-day-${getDay(date)}`, {
+        "moco-bx-calendar__day--active": active,
+        "moco-bx-calendar__day--filled": hours > 0,
+        "moco-bx-calendar__day--absence": absence,
+      })}
       onClick={handleClick}
     >
       <span className="moco-bx-calendar__day-of-week">
@@ -34,7 +30,7 @@ Day.propTypes = {
   hours: PropTypes.number.isRequired,
   absence: PropTypes.object,
   active: PropTypes.bool.isRequired,
-  onClick: PropTypes.func.isRequired
+  onClick: PropTypes.func.isRequired,
 }
 
 export default Day
diff --git a/src/js/components/Calendar/Hours.js b/src/js/components/Calendar/Hours.js
index 04ca61e..d5b7ba8 100644
--- a/src/js/components/Calendar/Hours.js
+++ b/src/js/components/Calendar/Hours.js
@@ -35,9 +35,9 @@ Hours.propTypes = {
   hours: PropTypes.number.isRequired,
   absence: PropTypes.shape({
     assignment_code: PropTypes.string,
-    assignment_color: PropTypes.string
+    assignment_color: PropTypes.string,
   }),
-  active: PropTypes.bool.isRequired
+  active: PropTypes.bool.isRequired,
 }
 
 export default Hours
diff --git a/src/js/components/Calendar/index.js b/src/js/components/Calendar/index.js
index a29613f..959db0a 100644
--- a/src/js/components/Calendar/index.js
+++ b/src/js/components/Calendar/index.js
@@ -5,22 +5,14 @@ import { formatDate } from "utils"
 import { eachDay } from "date-fns"
 import { pathEq } from "lodash/fp"
 
-const findAbsence = (date, schedules) =>
-  schedules.find(pathEq("date", formatDate(date)))
+const findAbsence = (date, schedules) => schedules.find(pathEq("date", formatDate(date)))
 
 const hoursAtDate = (date, activities) =>
   activities
     .filter(pathEq("date", formatDate(date)))
     .reduce((acc, activity) => acc + activity.hours, 0)
 
-const Calendar = ({
-  fromDate,
-  toDate,
-  selectedDate,
-  activities,
-  schedules,
-  onChange
-}) => (
+const Calendar = ({ fromDate, toDate, selectedDate, activities, schedules, onChange }) => (
   <div className="moco-bx-calendar">
     {eachDay(fromDate, toDate).map(date => (
       <Day
@@ -44,17 +36,17 @@ Calendar.propTypes = {
       id: PropTypes.number.isRequired,
       date: PropTypes.string.isRequired,
       hours: PropTypes.number.isRequired,
-      timer_started_at: PropTypes.string
-    }).isRequired
+      timer_started_at: PropTypes.string,
+    }).isRequired,
   ),
   schedules: PropTypes.arrayOf(
     PropTypes.shape({
       date: PropTypes.string,
       assignment_code: PropTypes.string,
-      assignment_color: PropTypes.string
-    })
+      assignment_color: PropTypes.string,
+    }),
   ).isRequired,
-  onChange: PropTypes.func.isRequired
+  onChange: PropTypes.func.isRequired,
 }
 
 export default Calendar
diff --git a/src/js/components/Errors/UnknownError.js b/src/js/components/Errors/UnknownError.js
index c0eba26..7e21d9c 100644
--- a/src/js/components/Errors/UnknownError.js
+++ b/src/js/components/Errors/UnknownError.js
@@ -15,7 +15,7 @@ const UnknownError = ({ message = "Unbekannter Fehler" }) => (
 )
 
 UnknownError.propTypes = {
-  message: PropTypes.string
+  message: PropTypes.string,
 }
 
 export default UnknownError
diff --git a/src/js/components/Errors/UpgradeRequiredError.js b/src/js/components/Errors/UpgradeRequiredError.js
index a5e416f..874b8b4 100644
--- a/src/js/components/Errors/UpgradeRequiredError.js
+++ b/src/js/components/Errors/UpgradeRequiredError.js
@@ -7,10 +7,7 @@ const UpgradeRequiredError = () => (
   <div className="moco-bx-error-container">
     <img className="moco-bx-logo" src={logo} alt="MOCO logo" />
     <h1>Upgrade erforderlich</h1>
-    <p>
-      Die installierte MOCO Browser-Erweiterung ist veraltet &mdash; bitte
-      aktualisieren.
-    </p>
+    <p>Die installierte MOCO Browser-Erweiterung ist veraltet &mdash; bitte aktualisieren.</p>
     {isChrome() ? (
       <button
         className="moco-bx-btn"
@@ -22,11 +19,7 @@ const UpgradeRequiredError = () => (
       <>
         <br />
         <p>Unter folgender URL:</p>
-        <img
-          className="firefox-addons"
-          src={firefoxAddons}
-          alt="about:addons"
-        />
+        <img className="firefox-addons" src={firefoxAddons} alt="about:addons" />
       </>
     )}
   </div>
diff --git a/src/js/components/Form.js b/src/js/components/Form.js
index f429c51..ff79b49 100644
--- a/src/js/components/Form.js
+++ b/src/js/components/Form.js
@@ -8,24 +8,24 @@ class Form extends Component {
     changeset: PropTypes.shape({
       project: PropTypes.object,
       task: PropTypes.object,
-      hours: PropTypes.string
+      hours: PropTypes.string,
     }).isRequired,
     errors: PropTypes.object,
     projects: PropTypes.array.isRequired,
     onChange: PropTypes.func.isRequired,
-    onSubmit: PropTypes.func.isRequired
-  };
+    onSubmit: PropTypes.func.isRequired,
+  }
 
   static defaultProps = {
-    inline: true
-  };
+    inline: true,
+  }
 
   isValid = () => {
     const { changeset } = this.props
     return ["assignment_id", "task_id", "hours", "description"]
       .map(prop => changeset[prop])
       .every(Boolean)
-  };
+  }
 
   handleTextareaKeyDown = event => {
     const { onSubmit } = this.props
@@ -34,7 +34,7 @@ class Form extends Component {
       event.preventDefault()
       this.isValid() && onSubmit(event)
     }
-  };
+  }
 
   render() {
     const { projects, changeset, errors, onChange, onSubmit } = this.props
@@ -44,7 +44,7 @@ class Form extends Component {
       <form onSubmit={onSubmit}>
         <div
           className={cn("form-group", {
-            "has-error": errors.assignment_id || errors.task_id
+            "has-error": errors.assignment_id || errors.task_id,
           })}
         >
           <Select
@@ -69,9 +69,7 @@ class Form extends Component {
           {errors.assignment_id ? (
             <div className="form-error">{errors.assignment_id.join("; ")}</div>
           ) : null}
-          {errors.task_id ? (
-            <div className="form-error">{errors.task_id.join("; ")}</div>
-          ) : null}
+          {errors.task_id ? <div className="form-error">{errors.task_id.join("; ")}</div> : null}
         </div>
         <div className={cn("form-group", { "has-error": errors.hours })}>
           <input
@@ -83,9 +81,7 @@ class Form extends Component {
             autoComplete="off"
             autoFocus
           />
-          {errors.hours ? (
-            <div className="form-error">{errors.hours.join("; ")}</div>
-          ) : null}
+          {errors.hours ? <div className="form-error">{errors.hours.join("; ")}</div> : null}
         </div>
         <div className={cn("form-group", { "has-error": errors.description })}>
           <textarea
diff --git a/src/js/components/Options.js b/src/js/components/Options.js
index 546ab9c..e1ba458 100644
--- a/src/js/components/Options.js
+++ b/src/js/components/Options.js
@@ -6,10 +6,10 @@ import ApiClient from "api/Client"
 
 @observer
 class Options extends Component {
-  @observable subdomain = "";
-  @observable apiKey = "";
-  @observable errorMessage = null;
-  @observable isSuccess = false;
+  @observable subdomain = ""
+  @observable apiKey = ""
+  @observable errorMessage = null
+  @observable isSuccess = false
 
   componentDidMount() {
     getSettings(false).then(({ subdomain, apiKey }) => {
@@ -20,7 +20,7 @@ class Options extends Component {
 
   onChange = event => {
     this[event.target.name] = event.target.value.trim()
-  };
+  }
 
   handleSubmit = _event => {
     this.isSuccess = false
@@ -30,7 +30,7 @@ class Options extends Component {
       const apiClient = new ApiClient({
         subdomain: this.subdomain,
         apiKey: this.apiKey,
-        version
+        version,
       })
       apiClient
         .login()
@@ -39,32 +39,27 @@ class Options extends Component {
           this.closeWindow()
         })
         .catch(error => {
-          this.errorMessage =
-            error.response?.data?.message || "Anmeldung fehlgeschlagen"
+          this.errorMessage = error.response?.data?.message || "Anmeldung fehlgeschlagen"
         })
     })
-  };
+  }
 
   handleInputKeyDown = event => {
     if (event.key === "Enter") {
       this.handleSubmit()
     }
-  };
+  }
 
   closeWindow = () => {
     isChrome() && window.close()
-  };
+  }
 
   render() {
     return (
       <div className="moco-bx-options">
         <h2 style={{ textAlign: "center" }}>Einstellungen</h2>
-        {this.errorMessage && (
-          <div className="text-danger">{this.errorMessage}</div>
-        )}
-        {this.isSuccess && (
-          <div className="text-success">Anmeldung erfolgreich</div>
-        )}
+        {this.errorMessage && <div className="text-danger">{this.errorMessage}</div>}
+        {this.isSuccess && <div className="text-success">Anmeldung erfolgreich</div>}
         <div className="form-group">
           <label>Internetadresse</label>
           <div className="input-group">
@@ -88,8 +83,7 @@ class Options extends Component {
             onChange={this.onChange}
           />
           <p className="text-muted">
-            Den API-Schlüssel findest du in deinem Profil unter
-            &quot;Integrationen&quot;.
+            Den API-Schlüssel findest du in deinem Profil unter &quot;Integrationen&quot;.
           </p>
         </div>
         <button className="moco-bx-btn" onClick={this.handleSubmit}>
diff --git a/src/js/components/Popup.js b/src/js/components/Popup.js
index da158f3..7173648 100644
--- a/src/js/components/Popup.js
+++ b/src/js/components/Popup.js
@@ -1,12 +1,7 @@
 import React, { Component } from "react"
 import PropTypes from "prop-types"
 import queryString from "query-string"
-import {
-  ERROR_UNKNOWN,
-  ERROR_UNAUTHORIZED,
-  ERROR_UPGRADE_REQUIRED,
-  serializeProps
-} from "utils"
+import { ERROR_UNKNOWN, ERROR_UNAUTHORIZED, ERROR_UPGRADE_REQUIRED, serializeProps } from "utils"
 import { isChrome } from "utils/browser"
 
 function getStyles(errorType) {
@@ -21,7 +16,7 @@ function getStyles(errorType) {
           : "461px"
         : errorType === ERROR_UNKNOWN
         ? "550px"
-        : "558px"
+        : "558px",
   }
 }
 
@@ -29,14 +24,14 @@ class Popup extends Component {
   static propTypes = {
     service: PropTypes.object,
     errorType: PropTypes.string,
-    onRequestClose: PropTypes.func.isRequired
-  };
+    onRequestClose: PropTypes.func.isRequired,
+  }
 
   handleRequestClose = event => {
     if (event.target.classList.contains("moco-bx-popup")) {
       this.props.onRequestClose()
     }
-  };
+  }
 
   componentDidMount() {
     // Document might lose focus when clicking the browser action.
@@ -64,7 +59,7 @@ class Popup extends Component {
       "fromDate",
       "toDate",
       "errorType",
-      "errorMessage"
+      "errorMessage",
     ])(this.props)
 
     const styles = getStyles(this.props.errorType)
@@ -73,9 +68,7 @@ class Popup extends Component {
       <div className="moco-bx-popup" onClick={this.handleRequestClose}>
         <div className="moco-bx-popup-content" style={styles}>
           <iframe
-            src={chrome.extension.getURL(
-              `popup.html?${queryString.stringify(serializedProps)}`
-            )}
+            src={chrome.extension.getURL(`popup.html?${queryString.stringify(serializedProps)}`)}
             width={styles.width}
             height={styles.height}
           />
diff --git a/src/js/components/Spinner.js b/src/js/components/Spinner.js
index ae54438..e199d72 100644
--- a/src/js/components/Spinner.js
+++ b/src/js/components/Spinner.js
@@ -1,14 +1,14 @@
-import React from 'react'
-import PropTypes from 'prop-types'
+import React from "react"
+import PropTypes from "prop-types"
 
 const Spinner = ({ style }) => (
-  <div className='moco-bx-spinner__container' style={style}>
-    <div className='moco-bx-spinner' role='status' />
+  <div className="moco-bx-spinner__container" style={style}>
+    <div className="moco-bx-spinner" role="status" />
   </div>
 )
 
 Spinner.propTypes = {
-  style: PropTypes.object
+  style: PropTypes.object,
 }
 
 export default Spinner
diff --git a/src/js/components/shared/Header.js b/src/js/components/shared/Header.js
index 245eeea..39b016b 100644
--- a/src/js/components/shared/Header.js
+++ b/src/js/components/shared/Header.js
@@ -1,20 +1,21 @@
-import React from 'react'
-import PropTypes from 'prop-types'
+import React from "react"
+import PropTypes from "prop-types"
 import logoUrl from "images/logo.png"
 
 const Header = ({ subdomain }) => (
   <div className="moco-bx-logo__container">
-    <a href={`https://${subdomain}.mocoapp.com/activities`} target="_blank" rel="noopener noreferrer">
-      <img
-        className="moco-bx-logo"
-        src={chrome.extension.getURL(logoUrl)}
-      />
+    <a
+      href={`https://${subdomain}.mocoapp.com/activities`}
+      target="_blank"
+      rel="noopener noreferrer"
+    >
+      <img className="moco-bx-logo" src={chrome.extension.getURL(logoUrl)} />
     </a>
   </div>
 )
 
 Header.propTypes = {
-  subdomain: PropTypes.string
+  subdomain: PropTypes.string,
 }
 
 export default Header
diff --git a/src/js/utils/TimeInputParser.js b/src/js/utils/TimeInputParser.js
index aba7a06..9be08ee 100644
--- a/src/js/utils/TimeInputParser.js
+++ b/src/js/utils/TimeInputParser.js
@@ -1,5 +1,5 @@
 export default class TimeInputParser {
-  #input;
+  #input
 
   constructor(input) {
     this.#input = input.toLowerCase().replace(/[\s()]/g, "")
@@ -25,11 +25,11 @@ export default class TimeInputParser {
     const calculated = hours * 3600 + minutes * 60
 
     return isNegative ? -calculated : calculated
-  };
+  }
 
   #parseDecimal = () => {
     return this.#input.replace(/[.,]/g, ".")
-  };
+  }
 
   #parseTimeAsSeconds = () => {
     const match = this.#isTime()
@@ -39,12 +39,12 @@ export default class TimeInputParser {
     const minutes = parseInt(match[3])
 
     return this.#calculateFromHoursAndMinutes(hours, minutes, isNegative)
-  };
+  }
 
   #parseMinutesAsSeconds = () => {
     const minutes = parseInt(this.#isMinutes()[1])
     return minutes * 60
-  };
+  }
 
   #parseRange = () => {
     const match = this.#isRange()
@@ -54,7 +54,7 @@ export default class TimeInputParser {
     const to_hours = parseInt(match[3])
     const to_minutes = parseInt(match[4])
     return (to_hours - from_hours) * 3600 + (to_minutes - from_minutes) * 60
-  };
+  }
 
   #parseHoursAndMinutes = () => {
     const match = this.#isHoursAndMinutes()
@@ -64,28 +64,26 @@ export default class TimeInputParser {
     const minutes = parseInt(match[3])
 
     return this.#calculateFromHoursAndMinutes(hours, minutes, isNegative)
-  };
+  }
 
   #isDecimal = () => {
     return this.#input.match(/^([-]?[0-9]{0,2})[.,]{1}([0-9]{1,2})$/)
-  };
+  }
 
   #isTime = () => {
     return this.#input.match(/^([-]?)([0-9]{1,2}):([0-9]{2})$/)
-  };
+  }
 
   #isMinutes = () => {
     return this.#input.match(/^([-]?[0-9]{1,3})(m|mins?)$/)
-  };
+  }
 
   #isRange = () => {
-    return this.#input.match(
-      /^([0-9]{1,2})[:.]{0,1}([0-9]{2})-([0-9]{1,2})[:.]{0,1}([0-9]{2})$/
-    )
-  };
+    return this.#input.match(/^([0-9]{1,2})[:.]{0,1}([0-9]{2})-([0-9]{1,2})[:.]{0,1}([0-9]{2})$/)
+  }
 
   #isHoursAndMinutes = () => {
     // 1h 14m(in)
     return this.#input.match(/^([-]?)([0-9]{1,2})h([0-9]{1,2})(m|mins?)$/)
-  };
+  }
 }
diff --git a/src/js/utils/messaging.js b/src/js/utils/messaging.js
index e5ec05b..7c3c161 100644
--- a/src/js/utils/messaging.js
+++ b/src/js/utils/messaging.js
@@ -1,14 +1,14 @@
 export class BackgroundMessenger {
-  #ports = new Map();
-  #handlers = new Map();
-  #onceHandlers = new Map();
+  #ports = new Map()
+  #handlers = new Map()
+  #onceHandlers = new Map()
 
   #handler = action => {
     const handler = this.#handlers.get(action.type)
     if (handler) {
       handler(action)
     }
-  };
+  }
 
   #onceHandler = action => {
     const handler = this.#onceHandlers.get(action.type)
@@ -16,7 +16,7 @@ export class BackgroundMessenger {
     if (handler) {
       handler(action)
     }
-  };
+  }
 
   #registerPort = (tabId, port) => {
     this.#ports.set(tabId, port)
@@ -25,14 +25,14 @@ export class BackgroundMessenger {
     port.onDisconnect.addListener(() => {
       this.#unregisterPort(tabId, port)
     })
-  };
+  }
 
   #unregisterPort = (tabId, port) => {
     port.onMessage.removeListener(this.#handler)
     port.onMessage.removeListener(this.#onceHandler)
     port.disconnect()
     this.#ports.delete(tabId)
-  };
+  }
 
   connectTab = tab => {
     const currentPort = this.#ports.get(tab.id)
@@ -40,41 +40,41 @@ export class BackgroundMessenger {
       const port = chrome.tabs.connect(tab.id)
       this.#registerPort(tab.id, port)
     }
-  };
+  }
 
   disconnectTab = tabId => {
     const port = this.#ports.get(tabId)
     if (port) {
       this.#unregisterPort(tabId, port)
     }
-  };
+  }
 
   postMessage = (tab, action) => {
     const port = this.#ports.get(tab.id)
     if (port) {
       port.postMessage(action)
     }
-  };
+  }
 
   once = (type, handler) => {
     this.#onceHandlers.set(type, handler)
-  };
+  }
 
   on = (type, handler) => {
     this.#handlers.set(type, handler)
-  };
+  }
 }
 
 export class ContentMessenger {
-  #port;
-  #handlers = new Map();
+  #port
+  #handlers = new Map()
 
   #handler = action => {
     const handler = this.#handlers.get(action.type)
     if (handler) {
       handler(action)
     }
-  };
+  }
 
   constructor(port) {
     this.#port = port
@@ -85,15 +85,15 @@ export class ContentMessenger {
     if (this.#port) {
       this.#port.postMessage(action)
     }
-  };
+  }
 
   on = (type, handler) => {
     this.#handlers.set(type, handler)
-  };
+  }
 
   stop = () => {
     this.#port.onMessage.removeListener(this.#handler)
     this.#port = null
     this.#handlers.clear()
-  };
+  }
 }