diff --git a/jest.config.js b/jest.config.js
index 9cf1531d4..cefd33e7a 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -17,5 +17,6 @@ module.exports = {
   },
   globals: {
     APP_REVISION: "jest-test",
+    APP_VERSION: "0.0.1",
   },
 };
diff --git a/src/components/mediaViewer/SeekLine.tsx b/src/components/mediaViewer/SeekLine.tsx
index 8bc900301..77c7b205d 100644
--- a/src/components/mediaViewer/SeekLine.tsx
+++ b/src/components/mediaViewer/SeekLine.tsx
@@ -10,7 +10,7 @@ import useSignal from '../../hooks/useSignal';
 import useCurrentTimeSignal from './hooks/currentTimeSignal';
 
 import { captureEvents } from '../../util/captureEvents';
-import { IS_TOUCH_ENV } from '../../util/windowEnvironment';
+import { IS_TOUCH_ENV, IS_VIDEO_PREVIEW_SUPPORTED } from '../../util/windowEnvironment';
 import buildClassName from '../../util/buildClassName';
 import { formatMediaDuration } from '../../util/dateFormat';
 import { clamp, round } from '../../util/math';
@@ -67,13 +67,14 @@ const SeekLine: React.FC<OwnProps> = ({
   }, [posterSize]);
 
   const setPreview = useLastCallback((time: number) => {
+    if (!IS_VIDEO_PREVIEW_SUPPORTED) return;
     time = Math.floor(time);
     setPreviewTime(time);
     renderVideoPreview(time);
   });
 
   useEffect(() => {
-    if (isPreviewDisabled || !url || !isReady) return undefined;
+    if (!IS_VIDEO_PREVIEW_SUPPORTED || isPreviewDisabled || !url || !isReady) return undefined;
     return createVideoPreviews(url, previewCanvasRef.current!);
   }, [url, isReady, isPreviewDisabled]);
 
diff --git a/src/util/cacheApi.ts b/src/util/cacheApi.ts
index 678089cf2..46f0b0e61 100644
--- a/src/util/cacheApi.ts
+++ b/src/util/cacheApi.ts
@@ -6,6 +6,8 @@ const cacheApi = self.caches;
 let isSupported: boolean | undefined;
 
 export async function isCacheApiSupported() {
+  if (!cacheApi) return false;
+
   isSupported = isSupported ?? await cacheApi.has('test').then(() => true).catch(() => false);
   return isSupported;
 }
diff --git a/src/util/languageDetection.ts b/src/util/languageDetection.ts
index af68b4f3c..9c51382ea 100644
--- a/src/util/languageDetection.ts
+++ b/src/util/languageDetection.ts
@@ -1,6 +1,7 @@
 import type { FastTextApi } from '../lib/fasttextweb/fasttext.worker';
 import type { Connector } from './PostMessageConnector';
 
+import { IS_TRANSLATION_SUPPORTED } from './windowEnvironment';
 import { createConnector } from './PostMessageConnector';
 import Deferred from './Deferred';
 
@@ -12,7 +13,9 @@ const DEFAULT_LABELS_COUNT = 5;
 let worker: Connector<FastTextApi> | undefined;
 const initializationDeferred = new Deferred();
 
-setTimeout(initWorker, WORKER_INIT_DELAY);
+if (IS_TRANSLATION_SUPPORTED) {
+  setTimeout(initWorker, WORKER_INIT_DELAY);
+}
 
 function initWorker() {
   if (!worker) {
diff --git a/src/util/launchMediaWorkers.ts b/src/util/launchMediaWorkers.ts
index 29bfb2b9b..4e425fe40 100644
--- a/src/util/launchMediaWorkers.ts
+++ b/src/util/launchMediaWorkers.ts
@@ -1,6 +1,7 @@
 import type { MediaWorkerApi } from '../lib/mediaWorker/index.worker';
 import type { Connector } from './PostMessageConnector';
 
+import { IS_VIDEO_PREVIEW_SUPPORTED } from './windowEnvironment';
 import { createConnector } from './PostMessageConnector';
 
 export const MAX_WORKERS = Math.min(navigator.hardwareConcurrency || 4, 4);
@@ -11,6 +12,7 @@ let instances: {
 }[] | undefined;
 
 export default function launchMediaWorkers() {
+  if (!IS_VIDEO_PREVIEW_SUPPORTED) return [];
   if (!instances) {
     instances = new Array(MAX_WORKERS).fill(undefined).map(
       () => {
diff --git a/src/util/windowEnvironment.ts b/src/util/windowEnvironment.ts
index 7a5bdb889..2d91d180f 100644
--- a/src/util/windowEnvironment.ts
+++ b/src/util/windowEnvironment.ts
@@ -81,6 +81,7 @@ export const IS_CANVAS_FILTER_SUPPORTED = (
 export const IS_REQUEST_FULLSCREEN_SUPPORTED = 'requestFullscreen' in document.createElement('div');
 export const ARE_CALLS_SUPPORTED = !navigator.userAgent.includes('Firefox');
 export const LAYERS_ANIMATION_NAME = IS_ANDROID ? 'slideFade' : IS_IOS ? 'slideLayers' : 'pushSlide';
+export const IS_VIDEO_PREVIEW_SUPPORTED = !IS_TEST;
 
 const TEST_VIDEO = document.createElement('video');
 // `canPlayType(VIDEO_MOV_TYPE)` returns false negative at least for macOS Chrome and iOS Safari
@@ -119,7 +120,7 @@ export const IS_BACKDROP_BLUR_SUPPORTED = CSS.supports('backdrop-filter: blur()'
 export const IS_INSTALL_PROMPT_SUPPORTED = 'onbeforeinstallprompt' in window;
 export const IS_MULTITAB_SUPPORTED = 'BroadcastChannel' in window;
 export const IS_OPEN_IN_NEW_TAB_SUPPORTED = IS_MULTITAB_SUPPORTED && !(IS_PWA && IS_MOBILE);
-export const IS_TRANSLATION_SUPPORTED = Boolean(Intl.DisplayNames);
+export const IS_TRANSLATION_SUPPORTED = !IS_TEST && Boolean(Intl.DisplayNames);
 
 export const MESSAGE_LIST_SENSITIVE_AREA = 750;