Replace string.substr and string.slice with string.substring

Improves semantic clarity, and it's recommended to not use substr.

1 files changed, 1 insertions, 1 deletions

diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index 1f9317e0..ac96f9e8 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -391,7 +391,7 @@ class Popup {
     static isOnExtensionPage() {
         try {
             const url = chrome.runtime.getURL('/');
-            return window.location.href.substr(0, url.length) === url;
+            return window.location.href.substring(0, url.length) === url;
         } catch (e) {
             // NOP
         }