diff --git a/src/classes/collection/collection.ts b/src/classes/collection/collection.ts
index 6fcd1cab1..c69fb21ab 100644
--- a/src/classes/collection/collection.ts
+++ b/src/classes/collection/collection.ts
@@ -8,7 +8,6 @@ import { rejection } from "../../helpers/promise";
 import { combine } from "../../functions/combine";
 import { extend, hasOwn, deepClone, keys, setByKeyPath, getByKeyPath } from "../../functions/utils";
 import { ModifyError } from "../../errors";
-import { hangsOnDeleteLargeKeyRange } from "../../globals/constants";
 import { ThenShortcut } from "../../public/types/then-shortcut";
 import { Transaction } from '../transaction';
 import { DBCoreCursor, DBCoreTransaction, DBCoreRangeType, DBCoreMutateResponse, DBCoreKeyRange } from '../../public/types/dbcore';
@@ -594,7 +593,7 @@ export class Collection implements ICollection {
       //deletingHook = ctx.table.hook.deleting.fire,
       //hasDeleteHook = deletingHook !== nop;
     if (isPlainKeyRange(ctx) &&
-      ((ctx.isPrimKey && !hangsOnDeleteLargeKeyRange) || range.type === DBCoreRangeType.Any)) // if no range, we'll use clear().
+      (ctx.isPrimKey || range.type === DBCoreRangeType.Any)) // if no range, we'll use clear().
     {
       // May use IDBObjectStore.delete(IDBKeyRange) in this case (Issue #208)
       // For chromium, this is the way most optimized version.
diff --git a/src/classes/version/schema-helpers.ts b/src/classes/version/schema-helpers.ts
index 6d683811f..366fd4a0a 100644
--- a/src/classes/version/schema-helpers.ts
+++ b/src/classes/version/schema-helpers.ts
@@ -8,7 +8,6 @@ import Promise, { PSD, newScope, NativePromise, decrementExpectedAwaits, increme
 import { exceptions } from '../../errors';
 import { TableSchema } from '../../public/types/table-schema';
 import { IndexSpec } from '../../public/types/index-spec';
-import { hasIEDeleteObjectStoreBug, isIEOrEdge } from '../../globals/constants';
 import { createIndexSpec, nameFromKeyPath } from '../../helpers/index-spec';
 import { createTableSchema } from '../../helpers/table-schema';
 import { generateMiddlewareStacks } from '../dexie/generate-middleware-stacks';
@@ -231,11 +230,9 @@ function updateTablesAndIndexes(
       }
     });
     queue.push(idbtrans => {
-      if (!anyContentUpgraderHasRun || !hasIEDeleteObjectStoreBug) { // Dont delete old tables if ieBug is present and a content upgrader has run. Let tables be left in DB so far. This needs to be taken care of.
-        const newSchema = version._cfg.dbschema;
-        // Delete old tables
-        deleteRemovedTables(newSchema, idbtrans);
-      }
+      const newSchema = version._cfg.dbschema;
+      // Delete old tables
+      deleteRemovedTables(newSchema, idbtrans);
       // Restore the final API
       removeTablesApi(db, [db.Transaction.prototype]);
       setApiOnPlace(db, [db.Transaction.prototype], db._storeNames, db._dbSchema);
@@ -316,7 +313,7 @@ export function getSchemaDiff(oldSchema: DbSchema, newSchema: DbSchema): SchemaD
             ''+(newDef.primKey.keyPath||'')
           ) ||
             // Compare the autoIncrement flag also
-          (oldDef.primKey.auto !== newDef.primKey.auto && !isIEOrEdge)) // IE has bug reading autoIncrement prop.
+          (oldDef.primKey.auto !== newDef.primKey.auto))
       {
         // Primary key has changed. Remove and re-add table.
         change.recreate = true;
diff --git a/src/globals/constants.ts b/src/globals/constants.ts
index 98bd0b21d..6fed78466 100644
--- a/src/globals/constants.ts
+++ b/src/globals/constants.ts
@@ -7,10 +7,6 @@ export const INVALID_KEY_ARGUMENT =
   "Invalid key provided. Keys must be of type string, number, Date or Array<string | number | Date>.";
 export const STRING_EXPECTED = "String expected.";
 export const connections: Dexie[] = [];
-export const isIEOrEdge =
-  typeof navigator !== 'undefined' && /(MSIE|Trident|Edge)/.test(navigator.userAgent);
-export const hasIEDeleteObjectStoreBug = isIEOrEdge;
-export const hangsOnDeleteLargeKeyRange = isIEOrEdge;
 export const dexieStackFrameFilter = frame => !/(dexie\.js|dexie\.min\.js)/.test(frame);
 export const DBNAMES_DB = '__dbnames';
 export const READONLY = 'readonly';
diff --git a/src/live-query/propagate-locally.ts b/src/live-query/propagate-locally.ts
index c5b6c8f76..b79c9430d 100644
--- a/src/live-query/propagate-locally.ts
+++ b/src/live-query/propagate-locally.ts
@@ -1,4 +1,3 @@
-import { isIEOrEdge } from '../globals/constants';
 import { globalEvents, DEXIE_STORAGE_MUTATED_EVENT_NAME, STORAGE_MUTATED_DOM_EVENT_NAME } from '../globals/global-events';
 import { ObservabilitySet } from "../public/types/db-events";
 import { signalSubscribersNow } from './cache/signalSubscribers';
@@ -7,14 +6,9 @@ if (typeof dispatchEvent !== 'undefined' && typeof addEventListener !== 'undefin
   globalEvents(DEXIE_STORAGE_MUTATED_EVENT_NAME, updatedParts => {
     if (!propagatingLocally) {
       let event: CustomEvent<ObservabilitySet>;
-      if (isIEOrEdge) {
-        event = document.createEvent('CustomEvent');
-        event.initCustomEvent(STORAGE_MUTATED_DOM_EVENT_NAME, true, true, updatedParts);
-      } else {
-        event = new CustomEvent(STORAGE_MUTATED_DOM_EVENT_NAME, {
-          detail: updatedParts
-        });
-      }
+      event = new CustomEvent(STORAGE_MUTATED_DOM_EVENT_NAME, {
+        detail: updatedParts
+      });
       propagatingLocally = true;
       dispatchEvent(event);
       propagatingLocally = false;