diff --git a/src/bg/Settings.js b/src/bg/Settings.js
index 28f880e..4fa83d0 100644
--- a/src/bg/Settings.js
+++ b/src/bg/Settings.js
@@ -180,7 +180,9 @@ var Settings = {
 
   async reloadOptionsUI() {
     try {
-      for (let t of await browser.tabs.query({url: browser.runtime.getManifest().options_ui.page })) {
+      for (let t of await browser.tabs.query({url: browser.extension.getURL(
+          browser.runtime.getManifest().options_ui.page) })
+      ) {
         browser.tabs.reload(t.id);
       };
     } catch (e) {
diff --git a/src/ui/popup.js b/src/ui/popup.js
index 87ac73e..310ecac 100644
--- a/src/ui/popup.js
+++ b/src/ui/popup.js
@@ -166,8 +166,10 @@ addEventListener("unload", e => {
     sitesUI.onChange = (row) => {
       pendingReload(!row.temp2perm);
       if (optionsClosed) return;
-      browser.tabs.query({url: browser.runtime.getManifest().options_ui.page })
-        .then(tabs => {
+      browser.tabs.query({
+        url: browser.extension.getURL(
+            browser.runtime.getManifest().options_ui.page)
+        }).then(tabs => {
           browser.tabs.remove(tabs.map(t => t.id));
       });
       optionsClosed = true;