diff --git a/public/popup.css b/public/popup.css
index 884f812e..83ab9fcd 100644
--- a/public/popup.css
+++ b/public/popup.css
@@ -34,6 +34,7 @@
 #sponsorBlockPopupBody {
   margin: 0;
   width: 374px;
+  max-width: 100%; /* NOTE: Ensures content doesn't exceed restricted popup widths in Firefox */
   font-family: var(--sb-main-font-family);
   font-size: 14px;
   background-color: var(--sb-main-bg-color);