diff --git a/.eslintrc.js b/.eslintrc.js
index 14702724f9..edbec961c2 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -88,6 +88,7 @@ module.exports = {
                 "@typescript-eslint/explicit-function-return-type": "off",
                 "@typescript-eslint/explicit-member-accessibility": "off",
                 "@typescript-eslint/ban-ts-comment": "off",
+                "@typescript-eslint/no-floating-promises": "off",
             },
         },
     ],
diff --git a/src/vector/index.ts b/src/vector/index.ts
index af22320d4f..e21fa5860a 100644
--- a/src/vector/index.ts
+++ b/src/vector/index.ts
@@ -180,7 +180,7 @@ async function start(): Promise<void> {
         // error handling begins here
         // ##########################
         if (!acceptBrowser) {
-            await new Promise<void>((resolve) => {
+            await new Promise<void>((resolve, reject) => {
                 logger.error("Browser is missing required features.");
                 // take to a different landing page to AWOOOOOGA at the user
                 showIncompatibleBrowser(() => {
@@ -189,7 +189,7 @@ async function start(): Promise<void> {
                     }
                     logger.log("User accepts the compatibility risks.");
                     resolve();
-                });
+                }).catch(reject);
             });
         }
 
diff --git a/src/vector/init.tsx b/src/vector/init.tsx
index 0b0e681c59..f5db07ba67 100644
--- a/src/vector/init.tsx
+++ b/src/vector/init.tsx
@@ -138,7 +138,7 @@ export async function loadLanguage(): Promise<void> {
 }
 
 export async function loadTheme(): Promise<void> {
-    setTheme();
+    return setTheme();
 }
 
 export async function loadApp(fragParams: {}): Promise<void> {
diff --git a/src/vector/jitsi/index.ts b/src/vector/jitsi/index.ts
index 1d3a54b41c..b30ee666a8 100644
--- a/src/vector/jitsi/index.ts
+++ b/src/vector/jitsi/index.ts
@@ -177,17 +177,17 @@ const setupCompleted = (async (): Promise<string | void> => {
                         }
                     }
 
-                    await widgetApi!.transport.reply(ev.detail, response);
+                    widgetApi!.transport.reply(ev.detail, response);
                 });
             };
 
             handleAction(ElementWidgetActions.JoinCall, async ({ audioInput, videoInput }) => {
-                joinConference(audioInput as string | null, videoInput as string | null);
+                void joinConference(audioInput as string | null, videoInput as string | null);
             });
             handleAction(ElementWidgetActions.HangupCall, async ({ force }) => {
                 if (force === true) {
                     meetApi?.dispose();
-                    notifyHangup();
+                    void notifyHangup();
                     meetApi = undefined;
                     closeConference();
                 } else {
@@ -297,7 +297,7 @@ function toggleConferenceVisibility(inConference: boolean): void {
 
 function skipToJitsiSplashScreen(): void {
     // really just a function alias for self-documenting code
-    joinConference();
+    void joinConference();
 }
 
 /**
@@ -500,8 +500,8 @@ const onVideoConferenceJoined = (): void => {
     if (widgetApi) {
         // ignored promise because we don't care if it works
         // noinspection JSIgnoredPromiseFromCall
-        widgetApi.setAlwaysOnScreen(true);
-        widgetApi.transport.send(ElementWidgetActions.JoinCall, {});
+        void widgetApi.setAlwaysOnScreen(true);
+        void widgetApi.transport.send(ElementWidgetActions.JoinCall, {});
     }
 
     // Video rooms should start in tile mode
@@ -509,7 +509,7 @@ const onVideoConferenceJoined = (): void => {
 };
 
 const onVideoConferenceLeft = (): void => {
-    notifyHangup();
+    void notifyHangup();
     meetApi = undefined;
 };
 
@@ -517,7 +517,7 @@ const onErrorOccurred = ({ error }: Parameters<ExternalAPIEventCallbacks["errorO
     if (error.isFatal) {
         // We got disconnected. Since Jitsi Meet might send us back to the
         // prejoin screen, we're forced to act as if we hung up entirely.
-        notifyHangup(error.message);
+        void notifyHangup(error.message);
         meetApi = undefined;
         closeConference();
     }
@@ -525,7 +525,7 @@ const onErrorOccurred = ({ error }: Parameters<ExternalAPIEventCallbacks["errorO
 
 const onAudioMuteStatusChanged = ({ muted }: AudioMuteStatusChangedEvent): void => {
     const action = muted ? ElementWidgetActions.MuteAudio : ElementWidgetActions.UnmuteAudio;
-    widgetApi?.transport.send(action, {});
+    void widgetApi?.transport.send(action, {});
 };
 
 const onVideoMuteStatusChanged = ({ muted }: VideoMuteStatusChangedEvent): void => {
@@ -535,15 +535,15 @@ const onVideoMuteStatusChanged = ({ muted }: VideoMuteStatusChangedEvent): void
         // otherwise the React SDK will mistakenly think the user turned off
         // their video by hand
         setTimeout(() => {
-            if (meetApi) widgetApi?.transport.send(ElementWidgetActions.MuteVideo, {});
+            if (meetApi) void widgetApi?.transport.send(ElementWidgetActions.MuteVideo, {});
         }, 200);
     } else {
-        widgetApi?.transport.send(ElementWidgetActions.UnmuteVideo, {});
+        void widgetApi?.transport.send(ElementWidgetActions.UnmuteVideo, {});
     }
 };
 
 const updateParticipants = (): void => {
-    widgetApi?.transport.send(ElementWidgetActions.CallParticipants, {
+    void widgetApi?.transport.send(ElementWidgetActions.CallParticipants, {
         participants: meetApi?.getParticipantsInfo(),
     });
 };
diff --git a/src/vector/mobile_guide/index.ts b/src/vector/mobile_guide/index.ts
index 7c14a25867..91e10181f1 100644
--- a/src/vector/mobile_guide/index.ts
+++ b/src/vector/mobile_guide/index.ts
@@ -120,4 +120,4 @@ async function initPage(): Promise<void> {
     }
 }
 
-initPage();
+void initPage();
diff --git a/src/vector/platform/ElectronPlatform.tsx b/src/vector/platform/ElectronPlatform.tsx
index 1fca1c37d1..0ec3cf4e8b 100644
--- a/src/vector/platform/ElectronPlatform.tsx
+++ b/src/vector/platform/ElectronPlatform.tsx
@@ -167,15 +167,14 @@ export default class ElectronPlatform extends VectorBasePlatform {
             });
         });
 
-        window.electron.on("openDesktopCapturerSourcePicker", () => {
+        window.electron.on("openDesktopCapturerSourcePicker", async () => {
             const { finished } = Modal.createDialog(DesktopCapturerSourcePicker);
-            finished.then(([source]) => {
-                // getDisplayMedia promise does not return if no dummy is passed here as source
-                this.ipc.call("callDisplayMediaCallback", source ?? { id: "", name: "", thumbnailURL: "" });
-            });
+            const [source] = await finished;
+            // getDisplayMedia promise does not return if no dummy is passed here as source
+            await this.ipc.call("callDisplayMediaCallback", source ?? { id: "", name: "", thumbnailURL: "" });
         });
 
-        this.ipc.call("startSSOFlow", this.ssoID);
+        void this.ipc.call("startSSOFlow", this.ssoID);
 
         BreadcrumbsStore.instance.on(UPDATE_EVENT, this.onBreadcrumbsUpdate);
     }
@@ -195,7 +194,7 @@ export default class ElectronPlatform extends VectorBasePlatform {
             ),
             initial: getInitialLetter(r.name),
         }));
-        this.ipc.call("breadcrumbs", rooms);
+        void this.ipc.call("breadcrumbs", rooms);
     };
 
     private onUpdateDownloaded = async (ev: Event, { releaseNotes, releaseName }: SquirrelUpdate): Promise<void> => {
@@ -261,7 +260,7 @@ export default class ElectronPlatform extends VectorBasePlatform {
         const handler = notification.onclick as Function;
         notification.onclick = (): void => {
             handler?.();
-            this.ipc.call("focusWindow");
+            void this.ipc.call("focusWindow");
         };
 
         return notification;
@@ -399,7 +398,7 @@ export default class ElectronPlatform extends VectorBasePlatform {
     }
 
     public navigateForwardBack(back: boolean): void {
-        this.ipc.call(back ? "navigateBack" : "navigateForward");
+        void this.ipc.call(back ? "navigateBack" : "navigateForward");
     }
 
     public overrideBrowserShortcuts(): boolean {
diff --git a/src/vector/platform/WebPlatform.ts b/src/vector/platform/WebPlatform.ts
index da6f61b323..99c3c778a9 100644
--- a/src/vector/platform/WebPlatform.ts
+++ b/src/vector/platform/WebPlatform.ts
@@ -113,10 +113,10 @@ export default class WebPlatform extends VectorBasePlatform {
         // annoyingly, the latest spec says this returns a
         // promise, but this is only supported in Chrome 46
         // and Firefox 47, so adapt the callback API.
-        return new Promise(function (resolve) {
+        return new Promise(function (resolve, reject) {
             window.Notification.requestPermission((result) => {
                 resolve(result);
-            });
+            }).catch(reject);
         });
     }
 
@@ -148,7 +148,7 @@ export default class WebPlatform extends VectorBasePlatform {
         // Ideally, loading an old copy would be impossible with the
         // cache-control: nocache HTTP header set, but Firefox doesn't always obey it :/
         console.log("startUpdater, current version is " + getNormalizedAppVersion(WebPlatform.VERSION));
-        this.pollForUpdate((version: string, newVersion: string) => {
+        void this.pollForUpdate((version: string, newVersion: string) => {
             const query = parseQs(location);
             if (query.updated) {
                 console.log("Update reloaded but still on an old version, stopping");
@@ -207,7 +207,7 @@ export default class WebPlatform extends VectorBasePlatform {
 
     public startUpdateCheck(): void {
         super.startUpdateCheck();
-        this.pollForUpdate(showUpdateToast, hideUpdateToast).then((updateState) => {
+        void this.pollForUpdate(showUpdateToast, hideUpdateToast).then((updateState) => {
             dis.dispatch<CheckUpdatesPayload>({
                 action: Action.CheckUpdates,
                 ...updateState,
diff --git a/src/vector/rageshakesetup.ts b/src/vector/rageshakesetup.ts
index 50370eb163..67746b1afe 100644
--- a/src/vector/rageshakesetup.ts
+++ b/src/vector/rageshakesetup.ts
@@ -35,7 +35,7 @@ export function initRageshake(): Promise<void> {
     // we manually check persistence for rageshakes ourselves
     const prom = rageshake.init(/*setUpPersistence=*/ false);
     prom.then(
-        () => {
+        async () => {
             logger.log("Initialised rageshake.");
             logger.log(
                 "To fix line numbers in Chrome: " +
@@ -48,7 +48,7 @@ export function initRageshake(): Promise<void> {
                 rageshake.flush();
             });
 
-            rageshake.cleanup();
+            await rageshake.cleanup();
         },
         (err) => {
             logger.error("Failed to initialise rageshake: " + err);