diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 8b66cce8a3..00c29477ce 100644
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -10646,6 +10646,28 @@
       <key>Value</key>
       <real>50.0</real>
     </map>
+    <key>WellIconFlashCount</key>
+    <map>
+      <key>Comment</key>
+      <string>Number of flashes of IM Well and Notification Well icons after which flashing buttons stay lit up. Requires restart.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>S32</string>
+      <key>Value</key>
+      <integer>3</integer>
+    </map>
+    <key>WellIconFlashPeriod</key>
+    <map>
+      <key>Comment</key>
+      <string>Period at which IM Well and Notification Well icons flash (seconds). Requires restart.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>F32</string>
+      <key>Value</key>
+      <real>0.25</real>
+    </map>
     <key>WindLightUseAtmosShaders</key>
     <map>
       <key>Comment</key>
diff --git a/indra/newview/llchiclet.cpp b/indra/newview/llchiclet.cpp
index e39384b7b2..05d3d70c74 100644
--- a/indra/newview/llchiclet.cpp
+++ b/indra/newview/llchiclet.cpp
@@ -131,8 +131,6 @@ LLSysWellChiclet::Params::Params()
 : button("button")
 , unread_notifications("unread_notifications")
 , max_displayed_count("max_displayed_count", 99)
-, flash_to_lit_count("flash_to_lit_count", 3)
-, flash_period("flash_period", 0.5F)
 {
 	button.name("button");
 	button.tab_stop(FALSE);
@@ -152,7 +150,13 @@ LLSysWellChiclet::LLSysWellChiclet(const Params& p)
 	mButton = LLUICtrlFactory::create<LLButton>(button_params);
 	addChild(mButton);
 
-	mFlashToLitTimer = new FlashToLitTimer(p.flash_to_lit_count, p.flash_period, boost::bind(&LLSysWellChiclet::changeLitState, this));
+	// use settings from settings.xml to be able change them via Debug settings. See EXT-5973.
+	// Due to Timer is implemented as derived class from EventTimer it is impossible to change period
+	// in runtime. So, both settings are made as required restart.
+	static S32 flash_to_lit_count = gSavedSettings.getS32("WellIconFlashCount");
+	static F32 flash_period = gSavedSettings.getF32("WellIconFlashPeriod");
+
+	mFlashToLitTimer = new FlashToLitTimer(flash_to_lit_count, flash_period, boost::bind(&LLSysWellChiclet::changeLitState, this));
 }
 
 LLSysWellChiclet::~LLSysWellChiclet()
diff --git a/indra/newview/llchiclet.h b/indra/newview/llchiclet.h
index ba17c5970e..97f494b817 100644
--- a/indra/newview/llchiclet.h
+++ b/indra/newview/llchiclet.h
@@ -800,16 +800,6 @@ public:
 		 */
 		Optional<S32> max_displayed_count;
 
-		/**
-		 * How many time chiclet should flash before set "Lit" state. Default value is 3.
-		 */
-		Optional<S32> flash_to_lit_count;
-
-		/**
-		 * Period of flashing while setting "Lit" state, in seconds. Default value is 0.5.
-		 */
-		Optional<F32> flash_period;
-
 		Params();
 	};
 
diff --git a/indra/newview/skins/default/xui/en/panel_bottomtray.xml b/indra/newview/skins/default/xui/en/panel_bottomtray.xml
index c6ca814f58..e412c491fd 100644
--- a/indra/newview/skins/default/xui/en/panel_bottomtray.xml
+++ b/indra/newview/skins/default/xui/en/panel_bottomtray.xml
@@ -346,7 +346,6 @@ as for parent layout_panel (chiclet_list_panel) to resize bottom tray properly.
          user_resize="false">
             <chiclet_im_well
              max_displayed_count="99"
-             flash_period="0.3"
              follows="right"
              height="28"
              layout="topleft"
@@ -395,7 +394,6 @@ image_pressed_selected  "Lit" + "Selected" - there are new messages and the Well
          min_width="37"
          user_resize="false">
             <chiclet_notification
-             flash_period="0.25"
              follows="right"
              height="23"
              layout="topleft"