From 55070d585227360ea185b3f98eeb7f2c135cf076 Mon Sep 17 00:00:00 2001
From: Ajay Ramachandran <dev@ajay.app>
Date: Tue, 12 May 2020 21:17:52 -0400
Subject: Fixed mutation listener stack overflow on Firefox.

---
 src/js-components/previewBar.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/js-components/previewBar.ts b/src/js-components/previewBar.ts
index 2f6ceea3..a7e5c8ec 100644
--- a/src/js-components/previewBar.ts
+++ b/src/js-components/previewBar.ts
@@ -103,9 +103,14 @@ class PreviewBar {
 			categoryTooltip.classList.add("sbHidden");
 		});
 
-		const observer = new MutationObserver(() => {
+		const observer = new MutationObserver((mutations, observer) => {
 			if (!mouseOnSeekBar) return;
 
+			// See if mutation observed is only this ID (if so, ignore)
+			if (mutations.length == 1 && (mutations[0].target as HTMLElement).id === "sponsor-block-category-tooltip") {
+				return;
+			}
+
 			let tooltips = document.querySelectorAll(".ytp-tooltip-text");
 			for (const tooltip of tooltips) {
 				let splitData = tooltip.textContent.split(":");
-- 
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