diff --git a/Applications/Browser/BrowserConsoleClient.cpp b/Applications/Browser/BrowserConsoleClient.cpp
index 10c54af22d..ce1dd7e5cb 100644
--- a/Applications/Browser/BrowserConsoleClient.cpp
+++ b/Applications/Browser/BrowserConsoleClient.cpp
@@ -102,7 +102,7 @@ JS::Value BrowserConsoleClient::trace()
     for (auto& function_name : trace) {
         if (function_name.is_empty())
             function_name = "<anonymous>";
-        html.appendf(" -> %s<br>", function_name.characters());
+        html.appendff(" -> {}<br>", function_name);
     }
     m_console_widget.print_html(html.string_view());
     return JS::js_undefined();
@@ -112,7 +112,7 @@ JS::Value BrowserConsoleClient::count()
 {
     auto label = vm().argument_count() ? vm().argument(0).to_string_without_side_effects() : "default";
     auto counter_value = m_console.counter_increment(label);
-    m_console_widget.print_html(String::format("%s: %u", label.characters(), counter_value));
+    m_console_widget.print_html(String::formatted("{}: {}", label, counter_value));
     return JS::js_undefined();
 }
 
@@ -120,9 +120,9 @@ JS::Value BrowserConsoleClient::count_reset()
 {
     auto label = vm().argument_count() ? vm().argument(0).to_string_without_side_effects() : "default";
     if (m_console.counter_reset(label)) {
-        m_console_widget.print_html(String::format("%s: 0", label.characters()));
+        m_console_widget.print_html(String::formatted("{}: 0", label));
     } else {
-        m_console_widget.print_html(String::format("\"%s\" doesn't have a count", label.characters()));
+        m_console_widget.print_html(String::formatted("\"{}\" doesn't have a count", label));
     }
     return JS::js_undefined();
 }
diff --git a/Applications/Browser/ConsoleWidget.cpp b/Applications/Browser/ConsoleWidget.cpp
index 5e6b34cc90..167e855ce9 100644
--- a/Applications/Browser/ConsoleWidget.cpp
+++ b/Applications/Browser/ConsoleWidget.cpp
@@ -91,7 +91,7 @@ ConsoleWidget::ConsoleWidget()
             auto error = parser.errors()[0];
             auto hint = error.source_location_hint(js_source);
             if (!hint.is_empty())
-                output_html.append(String::format("<pre>%s</pre>", escape_html_entities(hint).characters()));
+                output_html.append(String::formatted("<pre>{}</pre>", escape_html_entities(hint)));
             m_interpreter->vm().throw_exception<JS::SyntaxError>(m_interpreter->global_object(), error.to_string());
         } else {
             m_interpreter->run(m_interpreter->global_object(), *program);
diff --git a/Applications/Browser/DownloadWidget.cpp b/Applications/Browser/DownloadWidget.cpp
index 2551cd3f0b..b14672d533 100644
--- a/Applications/Browser/DownloadWidget.cpp
+++ b/Applications/Browser/DownloadWidget.cpp
@@ -78,7 +78,7 @@ DownloadWidget::DownloadWidget(const URL& url)
     browser_image.load_from_file("/res/graphics/download-animation.gif");
     animation_layout.add_spacer();
 
-    auto& source_label = add<GUI::Label>(String::format("From: %s", url.to_string().characters()));
+    auto& source_label = add<GUI::Label>(String::formatted("From: {}", url));
     source_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
     source_label.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
     source_label.set_preferred_size(0, 16);
@@ -92,7 +92,7 @@ DownloadWidget::DownloadWidget(const URL& url)
     m_progress_label->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
     m_progress_label->set_preferred_size(0, 16);
 
-    auto& destination_label = add<GUI::Label>(String::format("To: %s", m_destination_path.characters()));
+    auto& destination_label = add<GUI::Label>(String::formatted("To: {}", m_destination_path));
     destination_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
     destination_label.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
     destination_label.set_preferred_size(0, 16);
@@ -138,7 +138,7 @@ void DownloadWidget::did_progress(Optional<u32> total_size, u32 downloaded_size)
         StringBuilder builder;
         builder.append("Downloaded ");
         builder.append(human_readable_size(downloaded_size));
-        builder.appendf(" in %d sec", m_elapsed_timer.elapsed() / 1000);
+        builder.appendff(" in {} sec", m_elapsed_timer.elapsed() / 1000);
         m_progress_label->set_text(builder.to_string());
     }
 
@@ -146,7 +146,7 @@ void DownloadWidget::did_progress(Optional<u32> total_size, u32 downloaded_size)
         StringBuilder builder;
         if (total_size.has_value()) {
             int percent = roundf(((float)downloaded_size / (float)total_size.value()) * 100);
-            builder.appendf("%d%%", percent);
+            builder.appendff("{}%", percent);
         } else {
             builder.append(human_readable_size(downloaded_size));
         }
@@ -172,14 +172,14 @@ void DownloadWidget::did_finish(bool success, const ByteBuffer& payload, RefPtr<
     m_cancel_button->update();
 
     if (!success) {
-        GUI::MessageBox::show(window(), String::format("Download failed for some reason"), "Download failed", GUI::MessageBox::Type::Error);
+        GUI::MessageBox::show(window(), String::formatted("Download failed for some reason"), "Download failed", GUI::MessageBox::Type::Error);
         window()->close();
         return;
     }
 
     auto file_or_error = Core::File::open(m_destination_path, Core::IODevice::WriteOnly);
     if (file_or_error.is_error()) {
-        GUI::MessageBox::show(window(), String::format("Cannot open %s for writing", m_destination_path.characters()), "Download failed", GUI::MessageBox::Type::Error);
+        GUI::MessageBox::show(window(), String::formatted("Cannot open {} for writing", m_destination_path), "Download failed", GUI::MessageBox::Type::Error);
         window()->close();
         return;
     }
diff --git a/Applications/Browser/History.cpp b/Applications/Browser/History.cpp
index 13df517ec2..4f93a2dfed 100644
--- a/Applications/Browser/History.cpp
+++ b/Applications/Browser/History.cpp
@@ -30,10 +30,10 @@ namespace Browser {
 
 void History::dump() const
 {
-    dbg() << "Dump " << m_items.size() << " item(s)";
+    dbgf("Dump {} items(s)", m_items.size());
     int i = 0;
     for (auto& item : m_items) {
-        dbg() << "[" << i << "] " << item << " " << (m_current == i ? '*' : ' ');
+        dbgf("[{}] {} {}", i, item, m_current == i ? '*' : ' ');
         ++i;
     }
 }
diff --git a/Applications/Browser/Tab.cpp b/Applications/Browser/Tab.cpp
index eff5930669..afee790978 100644
--- a/Applications/Browser/Tab.cpp
+++ b/Applications/Browser/Tab.cpp
@@ -78,7 +78,7 @@ static void start_download(const URL& url)
 {
     auto window = GUI::Window::construct();
     window->resize(300, 150);
-    window->set_title(String::format("0%% of %s", url.basename().characters()));
+    window->set_title(String::formatted("0% of {}", url.basename()));
     window->set_resizable(false);
     window->set_main_widget<DownloadWidget>(url);
     window->show();
@@ -504,7 +504,7 @@ void Tab::did_become_active()
             m_statusbar->set_text("");
             return;
         }
-        m_statusbar->set_text(String::format("Loading (%d pending resources...)", Web::ResourceLoader::the().pending_loads()));
+        m_statusbar->set_text(String::formatted("Loading ({} pending resources...)", Web::ResourceLoader::the().pending_loads()));
     };
 
     BookmarksBarWidget::the().on_bookmark_click = [this](auto& url, unsigned modifiers) {
@@ -546,4 +546,5 @@ Web::WebViewHooks& Tab::hooks()
         return *m_page_view;
     return *m_web_content_view;
 }
+
 }
diff --git a/Applications/Browser/main.cpp b/Applications/Browser/main.cpp
index b12c8ab8b5..f9a3408bac 100644
--- a/Applications/Browser/main.cpp
+++ b/Applications/Browser/main.cpp
@@ -144,7 +144,7 @@ int main(int argc, char** argv)
 
     tab_widget.on_change = [&](auto& active_widget) {
         auto& tab = static_cast<Browser::Tab&>(active_widget);
-        window->set_title(String::format("%s - Browser", tab.title().characters()));
+        window->set_title(String::formatted("{} - Browser", tab.title()));
         tab.did_become_active();
     };
 
@@ -171,7 +171,7 @@ int main(int argc, char** argv)
         new_tab.on_title_change = [&](auto title) {
             tab_widget.set_tab_title(new_tab, title);
             if (tab_widget.active_widget() == &new_tab)
-                window->set_title(String::format("%s - Browser", title.characters()));
+                window->set_title(String::formatted("{} - Browser", title));
         };
 
         new_tab.on_favicon_change = [&](auto& bitmap) {
@@ -193,7 +193,7 @@ int main(int argc, char** argv)
 
         new_tab.load(url);
 
-        dbg() << "Added new tab " << &new_tab << ", loading " << url;
+        dbgf("Added new tab {:p}, loading {}", &new_tab, url);
 
         if (activate)
             tab_widget.set_active_widget(&new_tab);