The best alternatives to Trackburnr are Heat-Map.co, Epilepsy Blocker, and heatmap.js. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tanka— Tanka = Slack + Glean, built for fast-growing startups.
Epilepsy Blocker is a chrome extensions that automatically blocks dangerous, flashing GIFs that may trigger an epileptic seizure to people with photosensitive epilepsy. Think of it as an AdBlocker, but for dangerous animated content.