diff --git a/js/js.libraries/src/core/javautil.kt b/js/js.libraries/src/core/javautil.kt
index 79523493918..8722d214825 100644
--- a/js/js.libraries/src/core/javautil.kt
+++ b/js/js.libraries/src/core/javautil.kt
@@ -18,7 +18,7 @@ public abstract class AbstractCollection<E>() : MutableCollection<E> {
     override fun iterator(): MutableIterator<E> = noImpl
 
     override fun add(e: E): Boolean = noImpl
-    override fun remove(o: Any?): Boolean = noImpl
+    override fun remove(o: E): Boolean = noImpl
 
     override fun addAll(c: Collection<E>): Boolean = noImpl
     override fun containsAll(c: Collection<E>): Boolean = noImpl
@@ -41,7 +41,7 @@ public abstract class AbstractList<E>() : AbstractCollection<E>(), MutableList<E
     override fun add(index: Int, element: E): Unit = noImpl
     override fun addAll(index: Int, c: Collection<E>): Boolean = noImpl
 
-    override fun remove(index: Int): E = noImpl
+    override fun removeAt(index: Int): E = noImpl
 
     override fun indexOf(o: Any?): Int = noImpl
     override fun lastIndexOf(o: Any?): Int = noImpl
diff --git a/libraries/stdlib/src/kotlin/collections/MutableCollections.kt b/libraries/stdlib/src/kotlin/collections/MutableCollections.kt
index d739a2221ce..870f840ad2e 100644
--- a/libraries/stdlib/src/kotlin/collections/MutableCollections.kt
+++ b/libraries/stdlib/src/kotlin/collections/MutableCollections.kt
@@ -22,6 +22,15 @@ public fun <K, V> Map.Entry<K, V>.getKey(): K = key
 @Deprecated("Use property `value` instead", ReplaceWith("this.value"))
 public fun <K, V> Map.Entry<K, V>.getValue(): V = value
 
+@Deprecated("Use operator 'get' instead", ReplaceWith("this[index]"))
+public fun CharSequence.charAt(index: Int): Char = this[index]
+
+@Deprecated("Use `removeAt` instead", ReplaceWith("this.removeAt(index)"))
+public fun <E> MutableList<E>.remove(index: Int): E = removeAt(index)
+
+@Deprecated("Use explicit cast to MutableCollection<Any?> instead", ReplaceWith("(this as MutableCollection<Any?>).remove(o)"))
+public fun <E> MutableCollection<E>.remove(o: Any?): Boolean = remove(o as E)
+
 /**
  * Adds the specified [element] to this mutable collection.
  */
diff --git a/libraries/stdlib/src/kotlin/collections/ReversedViews.kt b/libraries/stdlib/src/kotlin/collections/ReversedViews.kt
index bfc84efc9d4..33d667c3cb7 100644
--- a/libraries/stdlib/src/kotlin/collections/ReversedViews.kt
+++ b/libraries/stdlib/src/kotlin/collections/ReversedViews.kt
@@ -30,7 +30,7 @@ private open class ReversedListReadOnly<T>(protected open val delegate: List<T>)
 
 private class ReversedList<T>(protected override val delegate: MutableList<T>) : ReversedListReadOnly<T>(delegate) {
     override fun clear() = delegate.clear()
-    override fun remove(index: Int): T = delegate.remove(index.flipIndex())
+    override fun removeAt(index: Int): T = delegate.removeAt(index.flipIndex())
 
     override fun set(index: Int, element: T): T = delegate.set(index.flipIndex(), element)
     override fun add(index: Int, element: T) {
diff --git a/libraries/stdlib/src/kotlin/text/Strings.kt b/libraries/stdlib/src/kotlin/text/Strings.kt
index efd559f7f3e..cfe44983ace 100644
--- a/libraries/stdlib/src/kotlin/text/Strings.kt
+++ b/libraries/stdlib/src/kotlin/text/Strings.kt
@@ -191,15 +191,6 @@ public val String.indices: IntRange
 public val String.lastIndex: Int
     get() = this.length() - 1
 
-/**
- * Returns a character at the given index in a [CharSequence]. Allows to use the
- * index operator for working with character sequences:
- * ```
- * val c = charSequence[5]
- * ```
- */
-public operator fun CharSequence.get(index: Int): Char = this.charAt(index)
-
 /**
  * Returns `true` if this CharSequence has Unicode surrogate pair at the specified [index].
  */
diff --git a/libraries/stdlib/test/collections/ReversedViewsTest.kt b/libraries/stdlib/test/collections/ReversedViewsTest.kt
index d3317eec25d..5d5b171454e 100644
--- a/libraries/stdlib/test/collections/ReversedViewsTest.kt
+++ b/libraries/stdlib/test/collections/ReversedViewsTest.kt
@@ -157,11 +157,11 @@ class ReversedViewsTest {
         val original = arrayListOf(1, 2, 3, 4)
         val reversed = original.asReversed()
 
-        original.remove(3)
+        original.removeAt(3)
         assertEquals(listOf(1, 2, 3), original)
         assertEquals(listOf(3, 2, 1), reversed)
 
-        reversed.remove(2)
+        reversed.removeAt(2)
         assertEquals(listOf(2, 3), original)
         assertEquals(listOf(3, 2), reversed)
     }
@@ -201,7 +201,7 @@ class ReversedViewsTest {
 
     @test fun testRemoveIOOB() {
         val success = try {
-            arrayListOf(1, 2, 3).asReversed().remove(3)
+            arrayListOf(1, 2, 3).asReversed().removeAt(3)
             true
         } catch(expected: IndexOutOfBoundsException) {
             false