Incremented version to 1.3.1

src/contentScript.js

@@ -166,20 +166,30 @@ function restoreScrollability() {
 	*/
 function startConstantVigilance() {
 // 	console.log("startConstantVigilance");
-	var observer = new MutationObserver((mutationsList, observer) => {
-		window.requestIdleCallback(() => {
-			for (var mutation of mutationsList) {
-				killSticky(mutation.target);
-			}
+	var observer;
+	var starter = function() {
+		observer.observe(document.querySelector("html"), {
+			attributes: true,
+			childList: true,
+			subtree: true
 		});
+	};
+
+	observer = new MutationObserver((mutationsList, observer) => {
+		// Workaround for Firefox performance bug. Firefox does not properly
+		// coalesce mutations into the mutationsList, instead calling the
+		// callback potentially thousands of times. Therefore we must
+		// disconnect the observer, wait for the main thread to become idle,
+		// and then restart it.
+		observer.disconnect();
+		window.requestIdleCallback(() => {
+			killSticky();
+			starter();
+		}, {timeout: 1000});
 	});
 
 	console.log("Commencing vigilance for stickies!");
-	observer.observe(document.querySelector("html"), {
-		attributes: true, 
-		childList: true, 
-		subtree: true
-	});
+	starter();
 }
 
 /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
@@ -192,7 +202,7 @@ function beginKillingStickies() {
 	window.requestIdleCallback(() => {
 		killSticky();
 		startConstantVigilance();
-	});
+	}, {timeout: 1000});
 }
 
 /******************/

src/platform/chrome/manifest.json

@@ -1,7 +1,7 @@
 {
 	"manifest_version":	2,
 	"name":				"AlwaysKillSticky",
-	"version":			"1.3.0",
+	"version":			"1.3.1",
 	"description":		"Get rid of sticky elements on websites - permanently!",
 	"author":			"Said Achmiz",
 	"homepage_url":		"https://git.sr.ht/~achmizs/AlwaysKillSticky.git",

src/platform/firefox/manifest.json

@@ -1,7 +1,7 @@
 {
 	"manifest_version":				2,
 	"name":							"AlwaysKillSticky",
-	"version":						"1.3.0",
+	"version":						"1.3.1",
 	"description":					"Get rid of sticky elements on websites - permanently!",
 	"author":						"Said Achmiz",
 	"browser_specific_settings":	{