diff --git a/src/content/content.ts b/src/content/content.ts
index 4a9caff58b..8097b3210d 100644
--- a/src/content/content.ts
+++ b/src/content/content.ts
@@ -2088,9 +2088,10 @@ export class ContentHandler {
     } else if (dictToShow === 'prev') {
       dict = this.currentDict;
 
-      let prev =
-        (cycleOrder.length + (cycleOrder.indexOf(this.currentDict) - 1)) %
-        cycleOrder.length;
+      let prev = mod(
+        cycleOrder.indexOf(this.currentDict) - 1,
+        cycleOrder.length
+      );
       while (cycleOrder[prev] !== this.currentDict) {
         const prevDict = cycleOrder[prev];
         if (
@@ -2100,7 +2101,7 @@ export class ContentHandler {
           dict = prevDict;
           break;
         }
-        prev = --prev % cycleOrder.length;
+        prev = mod(--prev, cycleOrder.length);
       }
     } else {
       dict = dictToShow;
diff --git a/src/content/popup/popup.ts b/src/content/popup/popup.ts
index 2487310c74..3ccc04e201 100644
--- a/src/content/popup/popup.ts
+++ b/src/content/popup/popup.ts
@@ -32,11 +32,11 @@ import { renderKanjiEntries } from './kanji';
 import { renderMetadata } from './metadata';
 import { renderNamesEntries } from './names';
 import { renderCopyDetails, renderUpdatingStatus } from './status';
+import { onHorizontalSwipe } from './swipe';
 import { renderTabBar } from './tabs';
 import { renderWordEntries } from './words';
 
 import popupStyles from '../../../css/popup.css';
-import { onHorizontalSwipe } from './swipe';
 
 export type StartCopyCallback = (
   index: number,
@@ -126,7 +126,9 @@ export function renderPopup(
 
     windowElem.dataset.tabSide = options.tabDisplay || 'top';
 
+    console.log('Hello1');
     onHorizontalSwipe(contentContainer, (direction) => {
+      console.log('Hello?');
       if (options.onSwitchDictionary) {
         options.onSwitchDictionary(direction === 'left' ? 'prev' : 'next');
       }
diff --git a/src/content/popup/swipe.ts b/src/content/popup/swipe.ts
index b39c17d584..c7c0738262 100644
--- a/src/content/popup/swipe.ts
+++ b/src/content/popup/swipe.ts
@@ -21,7 +21,7 @@ export function onHorizontalSwipe(
     function (e) {
       startX = e.changedTouches[0].pageX;
       startY = e.changedTouches[0].pageY;
-      startTime = Date.now();
+      startTime = performance.now();
     },
     false
   );
@@ -41,7 +41,7 @@ export function onHorizontalSwipe(
       const touch = e.changedTouches[0];
       const deltaX = touch.pageX - startX;
       const deltaY = touch.pageY - startY;
-      const elapsedTime = Date.now() - startTime;
+      const elapsedTime = performance.now() - startTime;
 
       // Check that elapsed time is within specified, horizontal dist
       // traveled >= threshold, and vertical dist traveled <= 100
@@ -50,8 +50,7 @@ export function onHorizontalSwipe(
         Math.abs(deltaX) >= xMinThreshold &&
         Math.abs(deltaY) <= yMaxThreshold;
       if (isSwipe) {
-        const dir: HorizontalSwipeDirection = deltaX < 0 ? 'right' : 'left';
-        handler(dir);
+        handler(deltaX < 0 ? 'right' : 'left');
       }
     },
     false