Slack: pause animated GIFs
Freezes animated GIFs on their first frame so the conversation stops flickering and stays calm.
Code to copy
// Pause animated GIFs by freezing them onto a static canvas after they load
function freezeGifs() {
document.querySelectorAll('img[src*=".gif"]:not([data-jz-frozen])').forEach(function (img) {
img.setAttribute('data-jz-frozen', '1');
if (!img.naturalWidth) { return; }
const c = document.createElement('canvas');
c.width = img.naturalWidth;
c.height = img.naturalHeight;
try {
c.getContext('2d').drawImage(img, 0, 0);
img.src = c.toDataURL();
} catch (e) { /* cross-origin image, leave as is */ }
});
}
freezeGifs();
const gifObs = new MutationObserver(freezeGifs);
gifObs.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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