diff --git a/js/src/forum/utils/affixSidebar.js b/js/src/forum/utils/affixSidebar.js
deleted file mode 100644
index 7faca12f0..000000000
--- a/js/src/forum/utils/affixSidebar.js
+++ /dev/null
@@ -1,39 +0,0 @@
-/**
- * Setup the sidebar DOM element to be affixed to the top of the viewport
- * using Bootstrap's affix plugin.
- *
- * @param {DOMElement} element
- * @param {Boolean} isInitialized
- * @param {Object} context
- */
-export default function affixSidebar(element, isInitialized, context) {
-  if (isInitialized) return;
-
-  const onresize = () => {
-    const $sidebar = $(element);
-    const $header = $('#header');
-    const $footer = $('#footer');
-    const $affixElement = $sidebar.find('> ul');
-
-    $(window).off('.affix');
-    $affixElement.removeClass('affix affix-top affix-bottom').removeData('bs.affix');
-
-    // Don't affix the sidebar if it is taller than the viewport (otherwise
-    // there would be no way to scroll through its content).
-    if ($sidebar.outerHeight(true) > $(window).height() - $header.outerHeight(true)) return;
-
-    $affixElement.affix({
-      offset: {
-        top: () => $sidebar.offset().top - $header.outerHeight(true) - parseInt($sidebar.css('margin-top'), 10),
-        bottom: () => (this.bottom = $footer.outerHeight(true)),
-      },
-    });
-  };
-
-  // Register the affix plugin to execute on every window resize (and trigger)
-  $(window).on('resize', onresize).resize();
-
-  context.onunload = () => {
-    $(window).off('resize', onresize);
-  };
-}