diff --git a/chrome/options/options.mjs b/chrome/options/options.mjs
index 1e361230..df4b38c6 100644
--- a/chrome/options/options.mjs
+++ b/chrome/options/options.mjs
@@ -155,7 +155,7 @@ function createKeybindElement(keybind) {
   keybindsList.appendChild(containerElement);
 }
 
-document.getElementById('welcome').href = chrome?.runtime?.getURL('welcome.html') || './../welcome.html';
+document.getElementById('welcome').href = EnvUtils.isExtension() ? chrome?.runtime?.getURL('welcome.html') : './../welcome.html';
 
 playMP4URLs.addEventListener('change', () => {
   Options.playMP4URLs = playMP4URLs.checked;
diff --git a/chrome/player/main.mjs b/chrome/player/main.mjs
index 30590dc2..01dc64f7 100644
--- a/chrome/player/main.mjs
+++ b/chrome/player/main.mjs
@@ -167,7 +167,7 @@ async function loadSubtitles(subs) {
 }
 
 async function sortSubtitles(subs) {
-  if (!chrome?.i18n?.detectLanguage) {
+  if (!EnvUtils.isExtension() || !chrome?.i18n?.detectLanguage) {
     return subs;
   }
 
@@ -215,16 +215,18 @@ async function setup() {
   const urlParams = new URLSearchParams(window.location.search);
   const myParam = urlParams.get('frame_id');
 
-  chrome?.runtime?.sendMessage({
-    type: 'faststream',
-    url: window.location.href,
-    isExt: true,
-    frameId: parseInt(myParam) || 0,
-  }).then((data) => {
-    chrome.runtime.sendMessage({
-      type: 'ready',
+  if (EnvUtils.isExtension()) {
+    chrome?.runtime?.sendMessage({
+      type: 'faststream',
+      url: window.location.href,
+      isExt: true,
+      frameId: parseInt(myParam) || 0,
+    }).then((data) => {
+      chrome.runtime.sendMessage({
+        type: 'ready',
+      });
     });
-  });
+  }
 
   const version = window.fastStream.version;
   console.log('\n %c %c %cFast%cStream %c-%c ' + version + ' %c By Andrews54757 \n', 'background: url(https://user-images.githubusercontent.com/13282284/57593160-3a4fb080-7508-11e9-9507-33d45c4f9e41.png) no-repeat; background-size: 16px 16px; padding: 2px 6px; margin-right: 4px', 'background: rgb(50,50,50); padding:5px 0;', 'color: rgb(200,200,200); background: rgb(50,50,50); padding:5px 0;', 'color: rgb(200,200,200); background: rgb(50,50,50); padding:5px 0;', 'color: rgb(200,200,200); background: rgb(50,50,50); padding:5px 0;', 'color: #afbc2a; background: rgb(50,50,50); padding:5px 0;', 'color: black; background: #e9e9e9; padding:5px 0;');
diff --git a/chrome/player/modules/FSBlob.mjs b/chrome/player/modules/FSBlob.mjs
index 8538857c..ef77d0f5 100644
--- a/chrome/player/modules/FSBlob.mjs
+++ b/chrome/player/modules/FSBlob.mjs
@@ -2,15 +2,16 @@ import {IndexedDBManager} from '../network/IndexedDBManager.mjs';
 import {EnvUtils} from '../utils/EnvUtils.mjs';
 
 const BrowserCanAutoOffloadBlobs = EnvUtils.isChrome();
+const UseIndexedDB = !BrowserCanAutoOffloadBlobs && IndexedDBManager.isSupported();
 
 export class FSBlob {
   constructor() {
-    if (BrowserCanAutoOffloadBlobs) {
-      this.blobStore = new Map();
-    } else {
+    if (UseIndexedDB) {
       this.indexedDBManager = new IndexedDBManager();
       this.setupPromise = this.indexedDBManager.setup();
       this.blobStorePromises = new Map();
+    } else {
+      this.blobStore = new Map();
     }
 
     this.blobIndex = 0;
@@ -23,10 +24,10 @@ export class FSBlob {
   }
 
   _saveBlob(identifier, blob) {
-    if (BrowserCanAutoOffloadBlobs) {
-      this.blobStore.set(identifier, blob);
-    } else {
+    if (UseIndexedDB ) {
       this.blobStorePromises.set(identifier, this.saveBlobAsync(identifier, blob));
+    } else {
+      this.blobStore.set(identifier, blob);
     }
   }
 
@@ -44,11 +45,11 @@ export class FSBlob {
   }
 
   async getBlob(identifier) {
-    if (BrowserCanAutoOffloadBlobs) {
-      return this.blobStore.get(identifier);
-    } else {
+    if (UseIndexedDB) {
       await this.blobStorePromises.get(identifier);
       return await this.indexedDBManager.getFile(identifier);
+    } else {
+      return this.blobStore.get(identifier);
     }
   }
 
diff --git a/chrome/player/network/DownloadManager.mjs b/chrome/player/network/DownloadManager.mjs
index 84c1db25..561ba230 100644
--- a/chrome/player/network/DownloadManager.mjs
+++ b/chrome/player/network/DownloadManager.mjs
@@ -303,7 +303,7 @@ export class DownloadManager {
 
   async setup() {
     // Chrome can move blobs to file storage, so we don't need to use IndexedDB
-    if (!EnvUtils.isChrome()) {
+    if (!EnvUtils.isChrome() && IndexedDBManager.isSupported()) {
       this.indexedDBManager = new IndexedDBManager();
       await this.indexedDBManager.setup();
     }
diff --git a/chrome/player/network/IndexedDBManager.mjs b/chrome/player/network/IndexedDBManager.mjs
index 065d0c23..9a442160 100644
--- a/chrome/player/network/IndexedDBManager.mjs
+++ b/chrome/player/network/IndexedDBManager.mjs
@@ -5,6 +5,10 @@ export class IndexedDBManager {
   constructor() {
   }
 
+  static isSupported() {
+    return window.indexedDB !== undefined;
+  }
+
   async setup() {
     await this.close();
     this.prune();
@@ -107,6 +111,7 @@ export class IndexedDBManager {
   }
 
   async clearStorage() {
+    if (!this.db) return;
     return this.transact(this.db, 'files', 'readwrite', (transaction)=>{
       const metaDataStore = transaction.objectStore('files');
       return this.wrapRequest(metaDataStore.clear());
diff --git a/chrome/player/utils/EnvUtils.mjs b/chrome/player/utils/EnvUtils.mjs
index f3052d9d..31d0ddeb 100644
--- a/chrome/player/utils/EnvUtils.mjs
+++ b/chrome/player/utils/EnvUtils.mjs
@@ -18,7 +18,7 @@ export class EnvUtils {
   }
 
   static isExtension() {
-    return !!chrome?.extension;
+    return typeof chrome !== 'undefined' && !!chrome?.extension;
   }
 
   static getVersion() {