Refresh image cache to obscure activity

output/main.js

@@ -49,7 +49,7 @@ const filteredCommunities = {
 /**
  * Hanging reference to preloaded images to avoid garbage collection.
  */
-const preloadedImages = [];
+let preloadedImages = [];
 
 /**
  * Create an interactive version of the Community join link.
@@ -134,6 +134,9 @@ function onLoad() {
 	addQRModalHandlers();
 	addServerIconInteractions();
 	preloadImages();
+	setInterval(() => {
+		preloadImages();
+	}, 60 * 60E3);
 	reactToURLParameters();
 	addInformativeInteractions();
 }
@@ -320,6 +323,7 @@ function addQRModalHandlers() {
  * Prefetches images used in the page to prevent tracking.
  */
 function preloadImages() {
+	const preloadedImagesNew = [];
 	const rows = dom.tbl_communities_content_rows();
 	const identifiers = rows.map(
 		rowElement => rowElement.getAttribute(ATTRIBUTES.ROW.IDENTIFIER)
@@ -338,8 +342,9 @@ function preloadImages() {
 		}
 		const image = new Image();
 		image.src = icon;
-		preloadedImages.push(image);
+		preloadedImagesNew.push(image);
 	}
+	preloadedImages = preloadedImagesNew;
 }
 
 /**