diff --git a/site/content/docs/4.3/components/breadcrumb.md b/site/content/docs/4.3/components/breadcrumb.md
index 61d9c2a464..a6e953bb53 100644
--- a/site/content/docs/4.3/components/breadcrumb.md
+++ b/site/content/docs/4.3/components/breadcrumb.md
@@ -32,7 +32,7 @@ group: components
 
 ## Changing the separator
 
-Separators are automatically added in CSS through [`::before`](https://developer.mozilla.org/en-US/docs/Web/CSS/::before) and [`content`](https://developer.mozilla.org/en-US/docs/Web/CSS/content). They can be changed by changing `$breadcrumb-divider`. The [quote](https://sass-lang.com/documentation/functions/string#quote) function is needed to generate the quotes around a string, so if you want `>` as separator, you can use this:
+Separators are automatically added in CSS through [`::before`](https://developer.mozilla.org/en-US/docs/Web/CSS/::before) and [`content`](https://developer.mozilla.org/en-US/docs/Web/CSS/content). They can be changed by changing `$breadcrumb-divider`. The [quote](https://sass-lang.com/documentation/modules/string#quote) function is needed to generate the quotes around a string, so if you want `>` as separator, you can use this:
 
 ```scss
 $breadcrumb-divider: quote(">");
diff --git a/site/content/docs/4.3/components/dropdowns.md b/site/content/docs/4.3/components/dropdowns.md
index e53dc71ceb..54aad5ce43 100644
--- a/site/content/docs/4.3/components/dropdowns.md
+++ b/site/content/docs/4.3/components/dropdowns.md
@@ -8,7 +8,7 @@ toc: true
 
 ## Overview
 
-Dropdowns are toggleable, contextual overlays for displaying lists of links and more. They're made interactive with the included Bootstrap dropdown JavaScript plugin. They're toggled by clicking, not by hovering; this is [an intentional design decision](http://markdotto.com/2012/02/27/bootstrap-explained-dropdowns/).
+Dropdowns are toggleable, contextual overlays for displaying lists of links and more. They're made interactive with the included Bootstrap dropdown JavaScript plugin. They're toggled by clicking, not by hovering; this is [an intentional design decision](https://markdotto.com/2012/02/27/bootstrap-explained-dropdowns/).
 
 Dropdowns are built on a third party library, [Popper.js](https://popper.js.org/), which provides dynamic positioning and viewport detection. Be sure to include [popper.min.js]({{< param "cdn.popper" >}}) before Bootstrap's JavaScript or use `bootstrap.bundle.min.js` / `bootstrap.bundle.js` which contains Popper.js. Popper.js isn't used to position dropdowns in navbars though as dynamic positioning isn't required.
 
@@ -828,26 +828,26 @@ Options can be passed via data attributes or JavaScript. For data attributes, ap
       <td>
         <p>Offset of the dropdown relative to its target.</p>
         <p>When a function is used to determine the offset, it is called with an object containing the offset data as its first argument. The function must return an object with the same structure. The triggering element DOM node is passed as the second argument.</p>
-        <p>For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..offset.offset">offset docs</a>.</p>
+        <p>For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..offset.offset">offset docs</a>.</p>
       </td>
     </tr>
     <tr>
       <td>flip</td>
       <td>boolean</td>
       <td>true</td>
-      <td>Allow Dropdown to flip in case of an overlapping on the reference element. For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..flip.enabled">flip docs</a>.</td>
+      <td>Allow Dropdown to flip in case of an overlapping on the reference element. For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..flip.enabled">flip docs</a>.</td>
     </tr>
     <tr>
       <td>boundary</td>
       <td>string | element</td>
       <td>'scrollParent'</td>
-      <td>Overflow constraint boundary of the dropdown menu. Accepts the values of <code>'viewport'</code>, <code>'window'</code>, <code>'scrollParent'</code>, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..preventOverflow.boundariesElement">preventOverflow docs</a>.</td>
+      <td>Overflow constraint boundary of the dropdown menu. Accepts the values of <code>'viewport'</code>, <code>'window'</code>, <code>'scrollParent'</code>, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..preventOverflow.boundariesElement">preventOverflow docs</a>.</td>
     </tr>
     <tr>
       <td>reference</td>
       <td>string | element</td>
       <td>'toggle'</td>
-      <td>Reference element of the dropdown menu. Accepts the values of <code>'toggle'</code>, <code>'parent'</code>, or an HTMLElement reference. For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#referenceObject">referenceObject docs</a>.</td>
+      <td>Reference element of the dropdown menu. Accepts the values of <code>'toggle'</code>, <code>'parent'</code>, or an HTMLElement reference. For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#referenceObject">referenceObject docs</a>.</td>
     </tr>
     <tr>
       <td>display</td>
@@ -859,7 +859,7 @@ Options can be passed via data attributes or JavaScript. For data attributes, ap
       <td>popperConfig</td>
       <td>null | object</td>
       <td>null</td>
-      <td>To change Bootstrap's default Popper.js config, see <a href="https://popper.js.org/popper-documentation.html#Popper.Defaults">Popper.js's configuration</a></td>
+      <td>To change Bootstrap's default Popper.js config, see <a href="https://popper.js.org/docs/v1/#Popper.Defaults">Popper.js's configuration</a></td>
     </tr>
   </tbody>
 </table>
diff --git a/site/content/docs/4.3/components/popovers.md b/site/content/docs/4.3/components/popovers.md
index 5867ed6fcf..4e42ee0727 100644
--- a/site/content/docs/4.3/components/popovers.md
+++ b/site/content/docs/4.3/components/popovers.md
@@ -248,20 +248,20 @@ Note that for security reasons the `sanitize`, `sanitizeFn` and `whiteList` opti
       <td>offset</td>
       <td>number | string</td>
       <td>0</td>
-      <td>Offset of the popover relative to its target. For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..offset.offset">offset docs</a>.</td>
+      <td>Offset of the popover relative to its target. For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..offset.offset">offset docs</a>.</td>
     </tr>
     <tr>
       <td>fallbackPlacement</td>
       <td>string | array</td>
       <td>'flip'</td>
       <td>Allow to specify which position Popper will use on fallback. For more information refer to
-      Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..flip.behavior">behavior docs</a></td>
+      Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..flip.behavior">behavior docs</a></td>
     </tr>
     <tr>
       <td>boundary</td>
       <td>string | element</td>
       <td>'scrollParent'</td>
-      <td>Overflow constraint boundary of the popover. Accepts the values of <code>'viewport'</code>, <code>'window'</code>, <code>'scrollParent'</code>, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..preventOverflow.boundariesElement">preventOverflow docs</a>.</td>
+      <td>Overflow constraint boundary of the popover. Accepts the values of <code>'viewport'</code>, <code>'window'</code>, <code>'scrollParent'</code>, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..preventOverflow.boundariesElement">preventOverflow docs</a>.</td>
     </tr>
     <tr>
       <td>sanitize</td>
@@ -285,7 +285,7 @@ Note that for security reasons the `sanitize`, `sanitizeFn` and `whiteList` opti
       <td>popperConfig</td>
       <td>null | object</td>
       <td>null</td>
-      <td>To change Bootstrap's default Popper.js config, see <a href="https://popper.js.org/popper-documentation.html#Popper.Defaults">Popper.js's configuration</a></td>
+      <td>To change Bootstrap's default Popper.js config, see <a href="https://popper.js.org/docs/v1/#Popper.Defaults">Popper.js's configuration</a></td>
     </tr>
   </tbody>
 </table>
diff --git a/site/content/docs/4.3/components/tooltips.md b/site/content/docs/4.3/components/tooltips.md
index 087b80c009..384be87818 100644
--- a/site/content/docs/4.3/components/tooltips.md
+++ b/site/content/docs/4.3/components/tooltips.md
@@ -244,7 +244,7 @@ Note that for security reasons the `sanitize`, `sanitizeFn` and `whiteList` opti
       <td>
         <p>Offset of the tooltip relative to its target.</p>
         <p>When a function is used to determine the offset, it is called with an object containing the offset data as its first argument. The function must return an object with the same structure. The triggering element DOM node is passed as the second argument.</p>
-        <p>For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..offset.offset">offset docs</a>.</p>
+        <p>For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..offset.offset">offset docs</a>.</p>
       </td>
     </tr>
     <tr>
@@ -252,13 +252,13 @@ Note that for security reasons the `sanitize`, `sanitizeFn` and `whiteList` opti
       <td>string | array</td>
       <td>'flip'</td>
       <td>Allow to specify which position Popper will use on fallback. For more information refer to
-      Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..flip.behavior">behavior docs</a></td>
+      Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..flip.behavior">behavior docs</a></td>
     </tr>
     <tr>
       <td>boundary</td>
       <td>string | element</td>
       <td>'scrollParent'</td>
-      <td>Overflow constraint boundary of the tooltip. Accepts the values of <code>'viewport'</code>, <code>'window'</code>, <code>'scrollParent'</code>, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..preventOverflow.boundariesElement">preventOverflow docs</a>.</td>
+      <td>Overflow constraint boundary of the tooltip. Accepts the values of <code>'viewport'</code>, <code>'window'</code>, <code>'scrollParent'</code>, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's <a href="https://popper.js.org/docs/v1/#modifiers..preventOverflow.boundariesElement">preventOverflow docs</a>.</td>
     </tr>
     <tr>
       <td>sanitize</td>
@@ -282,7 +282,7 @@ Note that for security reasons the `sanitize`, `sanitizeFn` and `whiteList` opti
       <td>popperConfig</td>
       <td>null | object</td>
       <td>null</td>
-      <td>To change Bootstrap's default Popper.js config, see <a href="https://popper.js.org/popper-documentation.html#Popper.Defaults">Popper.js's configuration</a></td>
+      <td>To change Bootstrap's default Popper.js config, see <a href="https://popper.js.org/docs/v1/#Popper.Defaults">Popper.js's configuration</a></td>
     </tr>
   </tbody>
 </table>
diff --git a/site/content/docs/4.3/getting-started/browsers-devices.md b/site/content/docs/4.3/getting-started/browsers-devices.md
index 10c3fd9078..572cf5e47c 100644
--- a/site/content/docs/4.3/getting-started/browsers-devices.md
+++ b/site/content/docs/4.3/getting-started/browsers-devices.md
@@ -89,7 +89,7 @@ Similarly, the latest versions of most desktop browsers are supported.
   </tbody>
 </table>
 
-For Firefox, in addition to the latest normal stable release, we also support the latest [Extended Support Release (ESR)](https://www.mozilla.org/en-US/firefox/organizations/#faq) version of Firefox.
+For Firefox, in addition to the latest normal stable release, we also support the latest [Extended Support Release (ESR)](https://www.mozilla.org/en-US/firefox/enterprise/) version of Firefox.
 
 Unofficially, Bootstrap should look and behave well enough in Chromium and Chrome for Linux, and Firefox for Linux, though they are not officially supported.