diff --git a/AK/MACAddress.h b/AK/MACAddress.h
index 27ae58909c9..bcac9c8eecb 100644
--- a/AK/MACAddress.h
+++ b/AK/MACAddress.h
@@ -11,6 +11,7 @@
 #include <AK/Assertions.h>
 #include <AK/String.h>
 #include <AK/Types.h>
+#include <AK/Vector.h>
 
 class [[gnu::packed]] MACAddress {
     static constexpr size_t s_mac_address_length = 6u;
diff --git a/AK/String.cpp b/AK/String.cpp
index 66b61767c7e..a37ab8095a0 100644
--- a/AK/String.cpp
+++ b/AK/String.cpp
@@ -479,4 +479,9 @@ String String::vformatted(StringView fmtstr, TypeErasedFormatParams& params)
     return builder.to_string();
 }
 
+Vector<size_t> String::find_all(StringView needle) const
+{
+    return StringUtils::find_all(*this, needle);
+}
+
 }
diff --git a/AK/String.h b/AK/String.h
index d5c47e1dab1..97d8dab0cc0 100644
--- a/AK/String.h
+++ b/AK/String.h
@@ -149,7 +149,7 @@ public:
     [[nodiscard]] Optional<size_t> find(StringView const& needle, size_t start = 0) const { return StringUtils::find(*this, needle, start); }
     [[nodiscard]] Optional<size_t> find_last(char needle) const { return StringUtils::find_last(*this, needle); }
     // FIXME: Implement find_last(StringView const&) for API symmetry.
-    [[nodiscard]] Vector<size_t> find_all(StringView const& needle) const { return StringUtils::find_all(*this, needle); }
+    Vector<size_t> find_all(StringView needle) const;
     using SearchDirection = StringUtils::SearchDirection;
     [[nodiscard]] Optional<size_t> find_any_of(StringView const& needles, SearchDirection direction) const { return StringUtils::find_any_of(*this, needles, direction); }
 
diff --git a/AK/StringView.cpp b/AK/StringView.cpp
index 205f282d703..3bd40ac06be 100644
--- a/AK/StringView.cpp
+++ b/AK/StringView.cpp
@@ -8,9 +8,11 @@
 #include <AK/ByteBuffer.h>
 #include <AK/Find.h>
 #include <AK/FlyString.h>
+#include <AK/Function.h>
 #include <AK/Memory.h>
 #include <AK/String.h>
 #include <AK/StringView.h>
+#include <AK/Vector.h>
 
 namespace AK {
 
@@ -252,4 +254,31 @@ String StringView::replace(const StringView& needle, const StringView& replaceme
     return StringUtils::replace(*this, needle, replacement, all_occurrences);
 }
 
+Vector<size_t> StringView::find_all(StringView needle) const
+{
+    return StringUtils::find_all(*this, needle);
+}
+
+Vector<StringView> StringView::split_view_if(Function<bool(char)> const& predicate, bool keep_empty) const
+{
+    if (is_empty())
+        return {};
+
+    Vector<StringView> v;
+    size_t substart = 0;
+    for (size_t i = 0; i < length(); ++i) {
+        char ch = characters_without_null_termination()[i];
+        if (predicate(ch)) {
+            size_t sublen = i - substart;
+            if (sublen != 0 || keep_empty)
+                v.append(substring_view(substart, sublen));
+            substart = i + 1;
+        }
+    }
+    size_t taillen = length() - substart;
+    if (taillen != 0 || keep_empty)
+        v.append(substring_view(substart, taillen));
+    return v;
+}
+
 }
diff --git a/AK/StringView.h b/AK/StringView.h
index fa1905d8858..0ba49a5d545 100644
--- a/AK/StringView.h
+++ b/AK/StringView.h
@@ -9,11 +9,11 @@
 #include <AK/Assertions.h>
 #include <AK/Checked.h>
 #include <AK/Forward.h>
+#include <AK/Optional.h>
 #include <AK/Span.h>
 #include <AK/StdLibExtras.h>
 #include <AK/StringHash.h>
 #include <AK/StringUtils.h>
-#include <AK/Vector.h>
 
 namespace AK {
 
@@ -96,7 +96,7 @@ public:
     [[nodiscard]] Optional<size_t> find_last(char needle) const { return StringUtils::find_last(*this, needle); }
     // FIXME: Implement find_last(StringView const&) for API symmetry.
 
-    [[nodiscard]] Vector<size_t> find_all(StringView const& needle) const { return StringUtils::find_all(*this, needle); }
+    [[nodiscard]] Vector<size_t> find_all(StringView needle) const;
 
     using SearchDirection = StringUtils::SearchDirection;
     [[nodiscard]] Optional<size_t> find_any_of(StringView const& needles, SearchDirection direction = SearchDirection::Forward) { return StringUtils::find_any_of(*this, needles, direction); }
@@ -116,28 +116,7 @@ public:
     [[nodiscard]] Vector<StringView> split_view(char, bool keep_empty = false) const;
     [[nodiscard]] Vector<StringView> split_view(const StringView&, bool keep_empty = false) const;
 
-    template<typename UnaryPredicate>
-    [[nodiscard]] Vector<StringView> split_view_if(UnaryPredicate&& predicate, bool keep_empty = false) const
-    {
-        if (is_empty())
-            return {};
-
-        Vector<StringView> v;
-        size_t substart = 0;
-        for (size_t i = 0; i < length(); ++i) {
-            char ch = characters_without_null_termination()[i];
-            if (predicate(ch)) {
-                size_t sublen = i - substart;
-                if (sublen != 0 || keep_empty)
-                    v.append(substring_view(substart, sublen));
-                substart = i + 1;
-            }
-        }
-        size_t taillen = length() - substart;
-        if (taillen != 0 || keep_empty)
-            v.append(substring_view(substart, taillen));
-        return v;
-    }
+    [[nodiscard]] Vector<StringView> split_view_if(Function<bool(char)> const& predicate, bool keep_empty = false) const;
 
     // Create a Vector of StringViews split by line endings. As of CommonMark
     // 0.29, the spec defines a line ending as "a newline (U+000A), a carriage
diff --git a/AK/URL.h b/AK/URL.h
index ffcb5b5e405..7e8d9ac9b28 100644
--- a/AK/URL.h
+++ b/AK/URL.h
@@ -9,6 +9,7 @@
 
 #include <AK/String.h>
 #include <AK/StringView.h>
+#include <AK/Vector.h>
 
 namespace AK {
 
diff --git a/Kernel/Firmware/ACPI/MultiProcessorParser.h b/Kernel/Firmware/ACPI/MultiProcessorParser.h
index dcbed5950a8..26094c8ab4b 100644
--- a/Kernel/Firmware/ACPI/MultiProcessorParser.h
+++ b/Kernel/Firmware/ACPI/MultiProcessorParser.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/Types.h>
+#include <AK/Vector.h>
 #include <Kernel/Memory/Region.h>
 #include <Kernel/PhysicalAddress.h>
 #include <Kernel/VirtualAddress.h>
diff --git a/Kernel/KLexicalPath.cpp b/Kernel/KLexicalPath.cpp
index f3ed1b13354..8167cdb3f3a 100644
--- a/Kernel/KLexicalPath.cpp
+++ b/Kernel/KLexicalPath.cpp
@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Vector.h>
 #include <Kernel/KLexicalPath.h>
 
 namespace Kernel::KLexicalPath {
diff --git a/Tests/AK/TestAllOf.cpp b/Tests/AK/TestAllOf.cpp
index f8b23f71ce1..1dce469e2d7 100644
--- a/Tests/AK/TestAllOf.cpp
+++ b/Tests/AK/TestAllOf.cpp
@@ -8,6 +8,7 @@
 
 #include <AK/AllOf.h>
 #include <AK/Array.h>
+#include <AK/Vector.h>
 
 TEST_CASE(should_determine_if_predicate_applies_to_all_elements_in_container)
 {
diff --git a/Tests/AK/TestAnyOf.cpp b/Tests/AK/TestAnyOf.cpp
index 5b7400c5d21..7be265fc0be 100644
--- a/Tests/AK/TestAnyOf.cpp
+++ b/Tests/AK/TestAnyOf.cpp
@@ -8,6 +8,7 @@
 
 #include <AK/AnyOf.h>
 #include <AK/Array.h>
+#include <AK/Vector.h>
 
 TEST_CASE(should_determine_if_predicate_applies_to_any_element_in_container)
 {
diff --git a/Tests/AK/TestBinarySearch.cpp b/Tests/AK/TestBinarySearch.cpp
index 3e5d65c2404..bf7cdb76ae8 100644
--- a/Tests/AK/TestBinarySearch.cpp
+++ b/Tests/AK/TestBinarySearch.cpp
@@ -8,6 +8,7 @@
 
 #include <AK/BinarySearch.h>
 #include <AK/Span.h>
+#include <AK/Vector.h>
 #include <cstring>
 #include <new>
 
diff --git a/Tests/AK/TestDisjointChunks.cpp b/Tests/AK/TestDisjointChunks.cpp
index 5c8f982d365..0d6c1d1f21b 100644
--- a/Tests/AK/TestDisjointChunks.cpp
+++ b/Tests/AK/TestDisjointChunks.cpp
@@ -8,6 +8,7 @@
 
 #include <AK/DisjointChunks.h>
 #include <AK/String.h>
+#include <AK/Vector.h>
 
 TEST_CASE(basic)
 {
diff --git a/Tests/AK/TestIndexSequence.cpp b/Tests/AK/TestIndexSequence.cpp
index 31b94016515..1b897ff6b8b 100644
--- a/Tests/AK/TestIndexSequence.cpp
+++ b/Tests/AK/TestIndexSequence.cpp
@@ -8,6 +8,7 @@
 
 #include <AK/StdLibExtras.h>
 #include <AK/TypeList.h>
+#include <AK/Vector.h>
 
 template<typename F, typename... Args>
 F for_each_argument(F f, Args&&... args)
diff --git a/Tests/AK/TestOptional.cpp b/Tests/AK/TestOptional.cpp
index 006fe207165..2e71ce7f322 100644
--- a/Tests/AK/TestOptional.cpp
+++ b/Tests/AK/TestOptional.cpp
@@ -9,6 +9,7 @@
 
 #include <AK/Optional.h>
 #include <AK/String.h>
+#include <AK/Vector.h>
 
 TEST_CASE(basic_optional)
 {
diff --git a/Tests/AK/TestString.cpp b/Tests/AK/TestString.cpp
index fc55df1a5a4..0b3d859fa68 100644
--- a/Tests/AK/TestString.cpp
+++ b/Tests/AK/TestString.cpp
@@ -9,6 +9,7 @@
 #include <AK/FlyString.h>
 #include <AK/String.h>
 #include <AK/StringBuilder.h>
+#include <AK/Vector.h>
 #include <cstring>
 
 TEST_CASE(construct_empty)
diff --git a/Tests/AK/TestStringUtils.cpp b/Tests/AK/TestStringUtils.cpp
index 948adde861b..e634778e2a1 100644
--- a/Tests/AK/TestStringUtils.cpp
+++ b/Tests/AK/TestStringUtils.cpp
@@ -7,6 +7,7 @@
 #include <LibTest/TestCase.h>
 
 #include <AK/StringUtils.h>
+#include <AK/Vector.h>
 
 TEST_CASE(matches_null)
 {
diff --git a/Tests/AK/TestStringView.cpp b/Tests/AK/TestStringView.cpp
index a01b908a4dd..7b1d6435dc5 100644
--- a/Tests/AK/TestStringView.cpp
+++ b/Tests/AK/TestStringView.cpp
@@ -7,6 +7,7 @@
 #include <LibTest/TestCase.h>
 
 #include <AK/String.h>
+#include <AK/Vector.h>
 
 TEST_CASE(construct_empty)
 {
@@ -157,7 +158,7 @@ TEST_CASE(split_view)
     EXPECT_EQ(test_string_view.split_view("xx", true), Vector<StringView>({ "a", "bc", "d", "" }));
 
     test_string_view = "ax_b_cxd";
-    auto predicate = [](char ch) { return ch == 'x' || ch == '_'; };
+    Function<bool(char)> predicate = [](char ch) { return ch == 'x' || ch == '_'; };
     EXPECT_EQ(test_string_view.split_view_if(predicate), Vector<StringView>({ "a", "b", "c", "d" }));
     EXPECT_EQ(test_string_view.split_view_if(predicate, true), Vector<StringView>({ "a", "", "b", "c", "d" }));
     EXPECT_EQ(test_string_view.split_view_if(predicate), Vector<StringView>({ "a", "b", "c", "d" }));
diff --git a/Tests/LibRegex/RegexLibC.cpp b/Tests/LibRegex/RegexLibC.cpp
index 04794dbc08b..2b212c23d9e 100644
--- a/Tests/LibRegex/RegexLibC.cpp
+++ b/Tests/LibRegex/RegexLibC.cpp
@@ -7,6 +7,7 @@
 #include <LibTest/TestCase.h>
 
 #include <AK/StringBuilder.h>
+#include <AK/Vector.h>
 #include <LibC/regex.h>
 #include <stdio.h>
 
diff --git a/Userland/Libraries/LibDiff/Format.cpp b/Userland/Libraries/LibDiff/Format.cpp
index 147eab48df3..ee28282183a 100644
--- a/Userland/Libraries/LibDiff/Format.cpp
+++ b/Userland/Libraries/LibDiff/Format.cpp
@@ -7,6 +7,7 @@
 #include "Format.h"
 #include <AK/String.h>
 #include <AK/StringBuilder.h>
+#include <AK/Vector.h>
 
 namespace Diff {
 String generate_only_additions(const String& text)
diff --git a/Userland/Libraries/LibGfx/BitmapFont.h b/Userland/Libraries/LibGfx/BitmapFont.h
index ab70bd9db60..73b79b01353 100644
--- a/Userland/Libraries/LibGfx/BitmapFont.h
+++ b/Userland/Libraries/LibGfx/BitmapFont.h
@@ -12,6 +12,7 @@
 #include <AK/RefPtr.h>
 #include <AK/String.h>
 #include <AK/Types.h>
+#include <AK/Vector.h>
 #include <LibGfx/Font.h>
 #include <LibGfx/Size.h>
 
diff --git a/Userland/Libraries/LibGfx/Color.cpp b/Userland/Libraries/LibGfx/Color.cpp
index 2c2a288a812..aeae569155d 100644
--- a/Userland/Libraries/LibGfx/Color.cpp
+++ b/Userland/Libraries/LibGfx/Color.cpp
@@ -311,6 +311,30 @@ Optional<Color> Color::from_string(StringView const& string)
     return Color(r.value(), g.value(), b.value(), a.value());
 }
 
+Vector<Color> Color::shades(u32 steps, float max) const
+{
+    float shade = 1.f;
+    float step = max / steps;
+    Vector<Color> shades;
+    for (u32 i = 0; i < steps; i++) {
+        shade -= step;
+        shades.append(this->darkened(shade));
+    }
+    return shades;
+}
+
+Vector<Color> Color::tints(u32 steps, float max) const
+{
+    float shade = 1.f;
+    float step = max / steps;
+    Vector<Color> tints;
+    for (u32 i = 0; i < steps; i++) {
+        shade += step;
+        tints.append(this->lightened(shade));
+    }
+    return tints;
+}
+
 }
 
 bool IPC::encode(IPC::Encoder& encoder, Color const& color)
diff --git a/Userland/Libraries/LibGfx/Color.h b/Userland/Libraries/LibGfx/Color.h
index cdd1262498a..d8ed58f4f25 100644
--- a/Userland/Libraries/LibGfx/Color.h
+++ b/Userland/Libraries/LibGfx/Color.h
@@ -242,29 +242,8 @@ public:
         return Color(min(255, (int)((float)red() * amount)), min(255, (int)((float)green() * amount)), min(255, (int)((float)blue() * amount)), alpha());
     }
 
-    Vector<Color> shades(u32 steps, float max = 1.f) const
-    {
-        float shade = 1.f;
-        float step = max / steps;
-        Vector<Color> shades;
-        for (u32 i = 0; i < steps; i++) {
-            shade -= step;
-            shades.append(this->darkened(shade));
-        }
-        return shades;
-    }
-
-    Vector<Color> tints(u32 steps, float max = 1.f) const
-    {
-        float shade = 1.f;
-        float step = max / steps;
-        Vector<Color> tints;
-        for (u32 i = 0; i < steps; i++) {
-            shade += step;
-            tints.append(this->lightened(shade));
-        }
-        return tints;
-    }
+    Vector<Color> shades(u32 steps, float max = 1.f) const;
+    Vector<Color> tints(u32 steps, float max = 1.f) const;
 
     constexpr Color inverted() const
     {
diff --git a/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp b/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp
index 23c18b32249..6a543918dde 100644
--- a/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp
+++ b/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp
@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Vector.h>
 #include <LibGfx/Filters/FastBoxBlurFilter.h>
 
 namespace Gfx {
diff --git a/Userland/Libraries/LibJS/Runtime/PrivateEnvironment.h b/Userland/Libraries/LibJS/Runtime/PrivateEnvironment.h
index c50d200f165..81f8710cdfc 100644
--- a/Userland/Libraries/LibJS/Runtime/PrivateEnvironment.h
+++ b/Userland/Libraries/LibJS/Runtime/PrivateEnvironment.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/FlyString.h>
+#include <AK/Vector.h>
 #include <LibJS/Heap/Cell.h>
 
 namespace JS {
diff --git a/Userland/Libraries/LibWeb/Cookie/ParsedCookie.cpp b/Userland/Libraries/LibWeb/Cookie/ParsedCookie.cpp
index 4c1ed3f9226..5f74d07d463 100644
--- a/Userland/Libraries/LibWeb/Cookie/ParsedCookie.cpp
+++ b/Userland/Libraries/LibWeb/Cookie/ParsedCookie.cpp
@@ -5,6 +5,7 @@
  */
 
 #include "ParsedCookie.h"
+#include <AK/Function.h>
 #include <AK/StdLibExtras.h>
 #include <AK/Vector.h>
 #include <LibIPC/Decoder.h>
@@ -280,12 +281,12 @@ Optional<Core::DateTime> parse_date_time(StringView date_string)
         return to_uint(token, year);
     };
 
-    auto is_delimeter = [](char ch) {
+    Function<bool(char)> is_delimiter = [](char ch) {
         return ch == 0x09 || (ch >= 0x20 && ch <= 0x2f) || (ch >= 0x3b && ch <= 0x40) || (ch >= 0x5b && ch <= 0x60) || (ch >= 0x7b && ch <= 0x7e);
     };
 
     // 1. Using the grammar below, divide the cookie-date into date-tokens.
-    Vector<StringView> date_tokens = date_string.split_view_if(is_delimeter);
+    Vector<StringView> date_tokens = date_string.split_view_if(is_delimiter);
 
     // 2. Process each date-token sequentially in the order the date-tokens appear in the cookie-date.
     bool found_time = false;
diff --git a/Userland/Services/LookupServer/DNSName.cpp b/Userland/Services/LookupServer/DNSName.cpp
index 2d887b51ce5..fde5575bcae 100644
--- a/Userland/Services/LookupServer/DNSName.cpp
+++ b/Userland/Services/LookupServer/DNSName.cpp
@@ -7,6 +7,7 @@
 
 #include "DNSName.h"
 #include <AK/Random.h>
+#include <AK/Vector.h>
 #include <ctype.h>
 
 namespace LookupServer {
diff --git a/Userland/Shell/Formatter.h b/Userland/Shell/Formatter.h
index a8316b42edf..6a89a589127 100644
--- a/Userland/Shell/Formatter.h
+++ b/Userland/Shell/Formatter.h
@@ -12,6 +12,7 @@
 #include <AK/StringBuilder.h>
 #include <AK/StringView.h>
 #include <AK/Types.h>
+#include <AK/Vector.h>
 #include <ctype.h>
 
 namespace Shell {