Add option to disable tracking downvotes and clear when disabled

public/_locales/en/messages.json

@@ -209,6 +209,15 @@
     "enableViewTrackingInPrivate": {
         "message": "Enable Skip Count Tracking In Private/Incognito tabs"
     },
+    "enableTrackDownvotes": {
+        "message": "Store segment downvotes"
+    },
+    "whatTrackDownvotes": {
+        "message": "Any segments you downvote will remain hidden even after refreshing"
+    },
+    "trackDownvotesWarning": {
+        "message": "Warning: Disabling this will delete all previously stored downvotes"
+    },
     "enableQueryByHashPrefix": {
         "message": "Query By Hash Prefix"
     },

public/options/options.html

@@ -440,6 +440,20 @@
 						</label>
 					</div>
 				</div>
+
+				<div data-type="toggle" data-sync="trackDownvotes" data-confirm-on="false" data-confirm-message="trackDownvotesWarning">
+					<div class="switch-container">
+						<label class="switch">
+							<input id="trackDownvotes" type="checkbox" checked>
+							<span class="slider round"></span>
+						</label>
+						<label class="switch-label" for="trackDownvotes">
+							__MSG_enableTrackDownvotes__
+						</label>
+					</div>
+	
+					<div class="small-description">__MSG_whatTrackDownvotes__</div>
+				</div>
 	
 				<div data-type="button-press" data-sync="copyDebugInformation" data-confirm-message="copyDebugInformation">
 					<div class="option-button trigger-button">