diff --git a/extensions/CMakeLists.txt b/extensions/CMakeLists.txt
index 08e4295..b9aed40 100644
--- a/extensions/CMakeLists.txt
+++ b/extensions/CMakeLists.txt
@@ -4,9 +4,9 @@ find_qt5(Core Widgets)
 
 cmake_policy(SET CMP0037 OLD)
 
-add_library(Remove\ Repetition SHARED removerepeat.cpp extensionimpl.cpp)
-add_library(Copy\ to\ Clipboard SHARED copyclipboard.cpp extensionimpl.cpp)
-add_library(Bing\ Translate SHARED bingtranslate.cpp extensionimpl.cpp)
-add_library(Extra\ Newlines SHARED extranewlines.cpp extensionimpl.cpp)
+add_library(Bing\ Translate SHARED bingtranslate/bingtranslate.cpp extensionimpl.cpp)
+add_library(Copy\ to\ Clipboard SHARED copyclipboard/copyclipboard.cpp extensionimpl.cpp)
+add_library(Extra\ Newlines SHARED extranewlines/extranewlines.cpp extensionimpl.cpp)
+add_library(Remove\ Repetition SHARED removerepeat/removerepeat.cpp extensionimpl.cpp)
 
-target_link_libraries(Bing\ Translate winhttp.lib Qt5::Widgets)
+target_link_libraries(Bing\ Translate winhttp Qt5::Widgets)
diff --git a/extensions/bingtranslate.cpp b/extensions/bingtranslate/bingtranslate.cpp
similarity index 79%
rename from extensions/bingtranslate.cpp
rename to extensions/bingtranslate/bingtranslate.cpp
index 3a10fe3..a1580c1 100644
--- a/extensions/bingtranslate.cpp
+++ b/extensions/bingtranslate/bingtranslate.cpp
@@ -1,5 +1,8 @@
-#include "extension.h"
+#include "../extension.h"
 #include <winhttp.h>
+#include <vector>
+#include <mutex>
+#include <algorithm>
 #include <regex>
 #include <QInputDialog>
 #include <QTimer>
@@ -81,13 +84,13 @@ std::wstring Translate(std::wstring text, std::wstring& translateFrom, std::wstr
 	static HINTERNET internet = NULL;
 	if (!internet) internet = WinHttpOpen(L"Mozilla/5.0 Textractor", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, NULL, NULL, 0);
 
-	char buffer[10000] = {};
-	WideCharToMultiByte(CP_UTF8, 0, text.c_str(), -1, buffer, 10000, NULL, NULL);
+	char utf8[10000] = {};
+	WideCharToMultiByte(CP_UTF8, 0, text.c_str(), -1, utf8, 10000, NULL, NULL);
 	text.clear();
-	for (int i = 0; buffer[i];)
+	for (int i = 0; utf8[i];)
 	{
 		wchar_t utf8char[3] = {};
-		swprintf_s<3>(utf8char, L"%02X", (int)(unsigned char)buffer[i++]);
+		swprintf_s<3>(utf8char, L"%02X", (unsigned)utf8[i++]);
 		text += L"%" + std::wstring(utf8char);
 	}
 
@@ -123,10 +126,22 @@ std::wstring Translate(std::wstring text, std::wstring& translateFrom, std::wstr
 
 bool ProcessSentence(std::wstring& sentence, SentenceInfo sentenceInfo)
 {
-	if (sentenceInfo["hook address"] == -1 || sentenceInfo["current select"] != 1) return false;
+	if (sentenceInfo["hook address"] == -1) return false;
 
-	std::wstring translation;
-	std::wstring translateFrom;
+	{
+		static std::mutex m;
+		static std::vector<DWORD> requestTimes;
+		std::lock_guard l(m);
+		requestTimes.push_back(GetTickCount());
+		requestTimes.erase(std::remove_if(requestTimes.begin(), requestTimes.end(), [&](DWORD requestTime) { return GetTickCount() - requestTime > 60 * 1000; }), requestTimes.end());
+		if (!sentenceInfo["current select"] && requestTimes.size() > 30)
+		{
+			sentence += L"\r\nToo many translation requests: refuse to make more.";
+			return true;
+		}
+	}
+
+	std::wstring translation, translateFrom;
 	Translate(sentence, translateFrom, translateTo);
 	translation = Translate(sentence, translateFrom, translateTo);
 	for (auto& c : translation) if (c == L'\\') c = 0x200b;
diff --git a/extensions/copyclipboard.cpp b/extensions/copyclipboard/copyclipboard.cpp
similarity index 79%
rename from extensions/copyclipboard.cpp
rename to extensions/copyclipboard/copyclipboard.cpp
index 9b344f8..ee421a3 100644
--- a/extensions/copyclipboard.cpp
+++ b/extensions/copyclipboard/copyclipboard.cpp
@@ -1,8 +1,8 @@
-#include "extension.h"
+#include "../extension.h"
 
 bool ProcessSentence(std::wstring& sentence, SentenceInfo sentenceInfo)
 {
-	if (sentenceInfo["current select"] == 1 && sentenceInfo["hook address"] != -1)
+	if (sentenceInfo["current select"] && sentenceInfo["hook address"] != -1)
 	{
 		HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, (sentence.size() + 2) * sizeof(wchar_t));
 		memcpy(GlobalLock(hMem), sentence.c_str(), (sentence.size() + 2) * sizeof(wchar_t));
diff --git a/extensions/extranewlines.cpp b/extensions/extranewlines/extranewlines.cpp
similarity index 86%
rename from extensions/extranewlines.cpp
rename to extensions/extranewlines/extranewlines.cpp
index d0fb344..8e0555d 100644
--- a/extensions/extranewlines.cpp
+++ b/extensions/extranewlines/extranewlines.cpp
@@ -1,4 +1,4 @@
-#include "extension.h"
+#include "../extension.h"
 
 bool ProcessSentence(std::wstring& sentence, SentenceInfo sentenceInfo)
 {
diff --git a/extensions/removerepeat.cpp b/extensions/removerepeat/removerepeat.cpp
similarity index 98%
rename from extensions/removerepeat.cpp
rename to extensions/removerepeat/removerepeat.cpp
index 544649b..0def122 100644
--- a/extensions/removerepeat.cpp
+++ b/extensions/removerepeat/removerepeat.cpp
@@ -1,4 +1,4 @@
-#include "extension.h"
+#include "../extension.h"
 #include <set>
 #include <mutex>