diff --git a/README.md b/README.md
index aead7ae0da..ae6dd37193 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,6 @@ Support for this project has come from [Processing Foundation](https://processin
 Hosting and technical support has come from: 
 <br />
 <br />
-<a href="https://releasehub.com/" target="_blank"><img width="100" src="https://assets.website-files.com/603dd147c5b0a480611bd348/603dd147c5b0a469bc1bd451_logo--dark.svg" /></a>
+<a href="https://releasehub.com/" target="_blank" rel="noopener noreferrer"><img width="100" src="https://assets.website-files.com/603dd147c5b0a480611bd348/603dd147c5b0a469bc1bd451_logo--dark.svg" /></a>
 <br />
-<a href="https://www.browserstack.com/" target="_blank"><img width="100" src="https://user-images.githubusercontent.com/6063380/46976166-ab280a80-d096-11e8-983b-18dd38c8cc9b.png" /></a>
+<a href="https://www.browserstack.com/" target="_blank" rel="noopener noreferrer"><img width="100" src="https://user-images.githubusercontent.com/6063380/46976166-ab280a80-d096-11e8-983b-18dd38c8cc9b.png" /></a>
diff --git a/client/modules/About/pages/About.jsx b/client/modules/About/pages/About.jsx
index 40a8852333..a42c38b559 100644
--- a/client/modules/About/pages/About.jsx
+++ b/client/modules/About/pages/About.jsx
@@ -133,7 +133,7 @@ const About = () => {
             <a
               href="https://github.com/processing/p5.js-web-editor/releases"
               target="_blank"
-              rel="noreferrer"
+              rel="noopener noreferrer"
             >
               {t('About.WebEditor')}: <span>v{packageData?.version}</span>
             </a>
@@ -142,7 +142,7 @@ const About = () => {
             <a
               href="https://github.com/processing/p5.js/releases"
               target="_blank"
-              rel="noreferrer"
+              rel="noopener noreferrer"
             >
               p5.js: <span>v{p5version}</span>
             </a>
diff --git a/client/modules/IDE/components/AssetListRow.jsx b/client/modules/IDE/components/AssetListRow.jsx
index 756f5a2d79..fa2550399d 100644
--- a/client/modules/IDE/components/AssetListRow.jsx
+++ b/client/modules/IDE/components/AssetListRow.jsx
@@ -22,7 +22,7 @@ const AssetMenu = ({ item: asset }) => {
   return (
     <TableDropdown aria-label={t('AssetList.ToggleOpenCloseARIA')}>
       <MenuItem onClick={handleAssetDelete}>{t('AssetList.Delete')}</MenuItem>
-      <MenuItem href={asset.url} target="_blank">
+      <MenuItem href={asset.url} target="_blank" rel="noopener noreferrer">
         {t('AssetList.OpenNewTab')}
       </MenuItem>
     </TableDropdown>
diff --git a/client/modules/IDE/components/Preferences/index.jsx b/client/modules/IDE/components/Preferences/index.jsx
index c74614d70e..11f8a06027 100644
--- a/client/modules/IDE/components/Preferences/index.jsx
+++ b/client/modules/IDE/components/Preferences/index.jsx
@@ -122,7 +122,7 @@ export default function Preferences() {
   const markdownComponents = useMemo(() => {
     // eslint-disable-next-line react/no-unstable-nested-components
     const ExternalLink = ({ children, ...props }) => (
-      <a {...props} target="_blank">
+      <a {...props} target="_blank" rel="noopener noreferrer">
         {children}
       </a>
     );
@@ -622,7 +622,7 @@ export default function Preferences() {
                   <legend className="preference__warning">
                     <a
                       target="_blank"
-                      rel="noreferrer"
+                      rel="noopener noreferrer"
                       href={`https://${
                         versionInfo.isVersion2 ? 'beta.' : ''
                       }p5js.org/reference/p5.sound`}
diff --git a/client/modules/IDE/components/QuickAddList/QuickAddList.jsx b/client/modules/IDE/components/QuickAddList/QuickAddList.jsx
index 3ab1ecb593..bb1aa60ace 100644
--- a/client/modules/IDE/components/QuickAddList/QuickAddList.jsx
+++ b/client/modules/IDE/components/QuickAddList/QuickAddList.jsx
@@ -37,6 +37,7 @@ const Item = ({ isAdded, onSelect, name, url }) => {
         className="quick-add__item-view"
         to={url}
         target="_blank"
+        rel="noopener noreferrer"
         onClick={(e) => e.stopPropagation()}
       >
         {t('QuickAddList.View')}
diff --git a/client/modules/IDE/components/show-hint.js b/client/modules/IDE/components/show-hint.js
index 99f7552006..89cc29c94f 100644
--- a/client/modules/IDE/components/show-hint.js
+++ b/client/modules/IDE/components/show-hint.js
@@ -285,7 +285,7 @@ ${
   p5
     ? `<a href="https://p5js.org/reference/p5/${
         typeof p5 === 'string' ? p5 : name
-      }" role="link" onclick="event.stopPropagation()" target="_blank">\
+      }" role="link" onclick="event.stopPropagation()" target="_blank" rel="noopener noreferrer">\
 <span class="hint-hidden">open ${name} reference</span>\
 <span aria-hidden="true">&#10132;</span></a>`
     : `<span class="no-link-placeholder"><span class="hint-hidden">no reference for ${name}</span></span>`
diff --git a/translations/contributor_docs/ko/README.md b/translations/contributor_docs/ko/README.md
index 453ad38717..9d60eec814 100644
--- a/translations/contributor_docs/ko/README.md
+++ b/translations/contributor_docs/ko/README.md
@@ -34,5 +34,5 @@ p5.js 웹 에디터에서 버그를 발견하셨다면, [“이슈” 탭](https
 본 프로젝트는 [프로세싱 재단](https://processingfoundation.org/), [뉴욕대 ITP](https://tisch.nyu.edu/itp), [뉴욕시 교육부의 CS4All](http://cs4all.nyc/)에서 후원해주셨습니다.
 
 호스팅과 기술적 지원은 다음 단체들에서 해주셨습니다:<br />
-<a href="https://www.browserstack.com/" target="_blank"><img width="100" src="https://user-images.githubusercontent.com/6063380/46976166-ab280a80-d096-11e8-983b-18dd38c8cc9b.png" /></a> <a href="https://mlab.com" target="_blank"><img width="100" src="https://user-images.githubusercontent.com/6063380/46976572-dbbc7400-d097-11e8-89fe-c7bb08ed0775.png" /></a>
+<a href="https://www.browserstack.com/" target="_blank" rel="noopener noreferrer"><img width="100" src="https://user-images.githubusercontent.com/6063380/46976166-ab280a80-d096-11e8-983b-18dd38c8cc9b.png" /></a> <a href="https://mlab.com" target="_blank" rel="noopener noreferrer"><img width="100" src="https://user-images.githubusercontent.com/6063380/46976572-dbbc7400-d097-11e8-89fe-c7bb08ed0775.png" /></a>