diff --git a/src/core/frontend/applets/web_browser.cpp b/src/core/frontend/applets/web_browser.cpp
index 6a36b4b8f..3a3d3d0bf 100644
--- a/src/core/frontend/applets/web_browser.cpp
+++ b/src/core/frontend/applets/web_browser.cpp
@@ -13,7 +13,7 @@ DefaultWebBrowserApplet::~DefaultWebBrowserApplet() = default;
 
 void DefaultWebBrowserApplet::OpenPage(std::string_view filename,
                                        std::function<void()> unpack_romfs_callback,
-                                       std::function<void()> finished_callback) const {
+                                       std::function<void()> finished_callback) {
     LOG_INFO(Service_AM,
              "(STUBBED) called - No suitable web browser implementation found to open website page "
              "at '{}'!",
diff --git a/src/core/frontend/applets/web_browser.h b/src/core/frontend/applets/web_browser.h
index 41d272d26..f952856af 100644
--- a/src/core/frontend/applets/web_browser.h
+++ b/src/core/frontend/applets/web_browser.h
@@ -14,7 +14,7 @@ public:
     virtual ~WebBrowserApplet();
 
     virtual void OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
-                          std::function<void()> finished_callback) const = 0;
+                          std::function<void()> finished_callback) = 0;
 };
 
 class DefaultWebBrowserApplet final : public WebBrowserApplet {
@@ -22,7 +22,7 @@ public:
     ~DefaultWebBrowserApplet() override;
 
     void OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
-                  std::function<void()> finished_callback) const override;
+                  std::function<void()> finished_callback) override;
 };
 
 } // namespace Core::Frontend
diff --git a/src/core/hle/service/am/applets/error.cpp b/src/core/hle/service/am/applets/error.cpp
index fec014f3b..04774bedc 100644
--- a/src/core/hle/service/am/applets/error.cpp
+++ b/src/core/hle/service/am/applets/error.cpp
@@ -2,6 +2,10 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <array>
+#include <cstring>
+#include "common/assert.h"
+#include "common/logging/log.h"
 #include "common/string_util.h"
 #include "core/core.h"
 #include "core/frontend/applets/error.h"
@@ -54,7 +58,7 @@ struct ApplicationErrorArg {
 };
 static_assert(sizeof(ApplicationErrorArg) == 0x1014, "ApplicationErrorArg has incorrect size.");
 
-union ErrorArguments {
+union Error::ErrorArguments {
     ShowError error;
     ShowErrorRecord error_record;
     SystemErrorArg system_error;
@@ -107,6 +111,7 @@ void Error::Initialize() {
     case ErrorAppletMode::ShowSystemError:
         CopyArgumentData(data, args->system_error);
         error_code = ResultCode(Decode64BitError(args->system_error.error_code_64));
+        break;
     case ErrorAppletMode::ShowApplicationError:
         CopyArgumentData(data, args->application_error);
         error_code = ResultCode(args->application_error.error_code);
diff --git a/src/core/hle/service/am/applets/error.h b/src/core/hle/service/am/applets/error.h
index fcf9caef2..a3590d181 100644
--- a/src/core/hle/service/am/applets/error.h
+++ b/src/core/hle/service/am/applets/error.h
@@ -9,8 +9,6 @@
 
 namespace Service::AM::Applets {
 
-union ErrorArguments;
-
 enum class ErrorAppletMode : u8 {
     ShowError = 0,
     ShowSystemError = 1,
@@ -23,7 +21,7 @@ enum class ErrorAppletMode : u8 {
 
 class Error final : public Applet {
 public:
-    Error(const Core::Frontend::ErrorApplet& frontend);
+    explicit Error(const Core::Frontend::ErrorApplet& frontend);
     ~Error() override;
 
     void Initialize() override;
@@ -36,12 +34,14 @@ public:
     void DisplayCompleted();
 
 private:
+    union ErrorArguments;
+
     const Core::Frontend::ErrorApplet& frontend;
     ResultCode error_code = RESULT_SUCCESS;
-    ErrorAppletMode mode;
+    ErrorAppletMode mode = ErrorAppletMode::ShowError;
     std::unique_ptr<ErrorArguments> args;
 
-    bool complete;
+    bool complete = false;
 };
 
 } // namespace Service::AM::Applets
diff --git a/src/core/hle/service/am/applets/general_backend.cpp b/src/core/hle/service/am/applets/general_backend.cpp
index 18ab0718b..c591b9ac2 100644
--- a/src/core/hle/service/am/applets/general_backend.cpp
+++ b/src/core/hle/service/am/applets/general_backend.cpp
@@ -4,6 +4,7 @@
 
 #include <string>
 
+#include "common/assert.h"
 #include "common/hex_util.h"
 #include "common/logging/log.h"
 #include "core/core.h"
diff --git a/src/core/hle/service/am/applets/general_backend.h b/src/core/hle/service/am/applets/general_backend.h
index d7313e74a..2dd255d7c 100644
--- a/src/core/hle/service/am/applets/general_backend.h
+++ b/src/core/hle/service/am/applets/general_backend.h
@@ -15,7 +15,7 @@ enum class PhotoViewerAppletMode : u8 {
 
 class PhotoViewer final : public Applet {
 public:
-    PhotoViewer(const Core::Frontend::PhotoViewerApplet& frontend);
+    explicit PhotoViewer(const Core::Frontend::PhotoViewerApplet& frontend);
     ~PhotoViewer() override;
 
     void Initialize() override;
@@ -28,8 +28,8 @@ public:
 
 private:
     const Core::Frontend::PhotoViewerApplet& frontend;
-    bool complete;
-    PhotoViewerAppletMode mode;
+    bool complete = false;
+    PhotoViewerAppletMode mode = PhotoViewerAppletMode::CurrentApp;
 };
 
 class StubApplet final : public Applet {
diff --git a/src/core/hle/service/am/applets/profile_select.h b/src/core/hle/service/am/applets/profile_select.h
index cb281dd52..a2ac6cf50 100644
--- a/src/core/hle/service/am/applets/profile_select.h
+++ b/src/core/hle/service/am/applets/profile_select.h
@@ -7,7 +7,6 @@
 #include <vector>
 
 #include "common/common_funcs.h"
-#include "core/frontend/applets/software_keyboard.h"
 #include "core/hle/service/acc/profile_manager.h"
 #include "core/hle/service/am/applets/applets.h"
 
@@ -29,7 +28,7 @@ static_assert(sizeof(UserSelectionOutput) == 0x18, "UserSelectionOutput has inco
 
 class ProfileSelect final : public Applet {
 public:
-    ProfileSelect(const Core::Frontend::ProfileSelectApplet& frontend);
+    explicit ProfileSelect(const Core::Frontend::ProfileSelectApplet& frontend);
     ~ProfileSelect() override;
 
     void Initialize() override;
diff --git a/src/core/hle/service/am/applets/software_keyboard.h b/src/core/hle/service/am/applets/software_keyboard.h
index e97e1cd5b..0fbc43e51 100644
--- a/src/core/hle/service/am/applets/software_keyboard.h
+++ b/src/core/hle/service/am/applets/software_keyboard.h
@@ -55,7 +55,7 @@ static_assert(sizeof(KeyboardConfig) == 0x3E0, "KeyboardConfig has incorrect siz
 
 class SoftwareKeyboard final : public Applet {
 public:
-    SoftwareKeyboard(const Core::Frontend::SoftwareKeyboardApplet& frontend);
+    explicit SoftwareKeyboard(const Core::Frontend::SoftwareKeyboardApplet& frontend);
     ~SoftwareKeyboard() override;
 
     void Initialize() override;
diff --git a/src/core/hle/service/am/applets/web_browser.cpp b/src/core/hle/service/am/applets/web_browser.cpp
index a66e23fce..7878f5136 100644
--- a/src/core/hle/service/am/applets/web_browser.cpp
+++ b/src/core/hle/service/am/applets/web_browser.cpp
@@ -95,7 +95,7 @@ static FileSys::VirtualFile GetManualRomFS() {
     return nullptr;
 }
 
-WebBrowser::WebBrowser(const Core::Frontend::WebBrowserApplet& frontend) : frontend(frontend) {}
+WebBrowser::WebBrowser(Core::Frontend::WebBrowserApplet& frontend) : frontend(frontend) {}
 
 WebBrowser::~WebBrowser() = default;
 
diff --git a/src/core/hle/service/am/applets/web_browser.h b/src/core/hle/service/am/applets/web_browser.h
index 894bdb35a..7e0f34c7d 100644
--- a/src/core/hle/service/am/applets/web_browser.h
+++ b/src/core/hle/service/am/applets/web_browser.h
@@ -12,7 +12,7 @@ namespace Service::AM::Applets {
 
 class WebBrowser final : public Applet {
 public:
-    WebBrowser(const Core::Frontend::WebBrowserApplet& frontend);
+    WebBrowser(Core::Frontend::WebBrowserApplet& frontend);
     ~WebBrowser() override;
 
     void Initialize() override;
@@ -32,7 +32,7 @@ public:
     void Finalize();
 
 private:
-    const Core::Frontend::WebBrowserApplet& frontend;
+    Core::Frontend::WebBrowserApplet& frontend;
 
     bool complete = false;
     bool unpacked = false;
diff --git a/src/yuzu/applets/error.cpp b/src/yuzu/applets/error.cpp
index f7535e768..1fb2fe277 100644
--- a/src/yuzu/applets/error.cpp
+++ b/src/yuzu/applets/error.cpp
@@ -17,7 +17,7 @@ QtErrorDisplay::QtErrorDisplay(GMainWindow& parent) {
 QtErrorDisplay::~QtErrorDisplay() = default;
 
 void QtErrorDisplay::ShowError(ResultCode error, std::function<void()> finished) const {
-    this->callback = finished;
+    this->callback = std::move(finished);
     emit MainWindowDisplayError(
         tr("An error has occured.\nPlease try again or contact the developer of the "
            "software.\n\nError Code: %1-%2 (0x%3)")
@@ -28,7 +28,7 @@ void QtErrorDisplay::ShowError(ResultCode error, std::function<void()> finished)
 
 void QtErrorDisplay::ShowErrorWithTimestamp(ResultCode error, std::chrono::seconds time,
                                             std::function<void()> finished) const {
-    this->callback = finished;
+    this->callback = std::move(finished);
     emit MainWindowDisplayError(
         tr("An error occured on %1 at %2.\nPlease try again or contact the "
            "developer of the software.\n\nError Code: %3-%4 (0x%5)")
@@ -42,7 +42,7 @@ void QtErrorDisplay::ShowErrorWithTimestamp(ResultCode error, std::chrono::secon
 void QtErrorDisplay::ShowCustomErrorText(ResultCode error, std::string dialog_text,
                                          std::string fullscreen_text,
                                          std::function<void()> finished) const {
-    this->callback = finished;
+    this->callback = std::move(finished);
     emit MainWindowDisplayError(
         tr("An error has occured.\nError Code: %1-%2 (0x%3)\n\n%4\n\n%5")
             .arg(static_cast<u32>(error.module.Value()) + 2000, 4, 10, QChar::fromLatin1('0'))
diff --git a/src/yuzu/applets/web_browser.cpp b/src/yuzu/applets/web_browser.cpp
index 5b7b73518..ac80b2fa2 100644
--- a/src/yuzu/applets/web_browser.cpp
+++ b/src/yuzu/applets/web_browser.cpp
@@ -88,7 +88,7 @@ QtWebBrowser::QtWebBrowser(GMainWindow& main_window) {
 QtWebBrowser::~QtWebBrowser() = default;
 
 void QtWebBrowser::OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
-                            std::function<void()> finished_callback) const {
+                            std::function<void()> finished_callback) {
     this->unpack_romfs_callback = std::move(unpack_romfs_callback);
     this->finished_callback = std::move(finished_callback);
 
diff --git a/src/yuzu/applets/web_browser.h b/src/yuzu/applets/web_browser.h
index 983886586..1a3d67353 100644
--- a/src/yuzu/applets/web_browser.h
+++ b/src/yuzu/applets/web_browser.h
@@ -38,7 +38,7 @@ public:
     ~QtWebBrowser() override;
 
     void OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
-                  std::function<void()> finished_callback) const override;
+                  std::function<void()> finished_callback) override;
 
 signals:
     void MainWindowOpenPage(std::string_view filename, std::string_view additional_args) const;
@@ -47,6 +47,6 @@ private:
     void MainWindowUnpackRomFS();
     void MainWindowFinishedBrowsing();
 
-    mutable std::function<void()> unpack_romfs_callback;
-    mutable std::function<void()> finished_callback;
+    std::function<void()> unpack_romfs_callback;
+    std::function<void()> finished_callback;
 };