Slack: collapse threads by default
Collapses thread preview bars to a single line; clicking one expands it back when you want a look.
Code to copy
// Collapse inline thread preview bars so they take less vertical space
function collapseThreads() {
document.querySelectorAll('.c-message_kit__thread_replies_bar:not([data-jz-seen])').forEach(function (bar) {
bar.setAttribute('data-jz-seen', '1');
bar.style.maxHeight = '20px';
bar.style.overflow = 'hidden';
bar.style.cursor = 'pointer';
bar.title = 'Click to expand thread preview';
bar.addEventListener('click', function () {
bar.style.maxHeight = bar.style.maxHeight === '20px' ? 'none' : '20px';
}, true);
});
}
collapseThreads();
const thObs = new MutationObserver(collapseThreads);
thObs.observe(document.documentElement, { childList: true, subtree: true });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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