Facebook: J/K keyboard post navigation
Adds J and K keyboard shortcuts that smoothly scroll to the next and previous feed post.
Code to copy
// Add J/K keyboard shortcuts to jump between feed posts
function jumpPost(dir) {
const posts = Array.prototype.slice.call(
document.querySelectorAll('[role="feed"] [role="article"]'));
const y = window.scrollY + 80;
let target = null;
if (dir > 0) {
target = posts.find(function (p) { return p.offsetTop > y + 5; });
} else {
const before = posts.filter(function (p) { return p.offsetTop < y - 5; });
target = before[before.length - 1];
}
if (target) { window.scrollTo({ top: target.offsetTop - 70, behavior: 'smooth' }); }
}
document.addEventListener('keydown', function (e) {
const t = e.target;
if (t && (t.isContentEditable || t.tagName === 'INPUT' || t.tagName === 'TEXTAREA')) { return; }
if (e.key === 'j') { jumpPost(1); }
if (e.key === 'k') { jumpPost(-1); }
});How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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