diff --git a/.changelog/17783.txt b/.changelog/17783.txt
new file mode 100644
index 000000000..4181fa184
--- /dev/null
+++ b/.changelog/17783.txt
@@ -0,0 +1,3 @@
+```release-note:improvement
+ui: affix page header to the top of the browser window to handle browser extension push-down gracefully
+```
diff --git a/ui/app/styles/components/page-layout.scss b/ui/app/styles/components/page-layout.scss
index f8f22501a..82418b4bc 100644
--- a/ui/app/styles/components/page-layout.scss
+++ b/ui/app/styles/components/page-layout.scss
@@ -12,6 +12,7 @@
     position: fixed;
     width: 100%;
     z-index: $z-header;
+    top: 0;
 
     // Defensive styles in case header height goes over 100px, causing
     // the left gutter menu to be on top of the header.