It asks for a specific name you’ve never heard of (e.g., "HD Video Player Pro 2024") rather than a known update to your browser.
The primary goal of this pop-up is to get you to click "Install," which typically results in:
If your goal is to save a video for offline viewing, avoid "one-click" browser pop-ups. Instead, use these reputable methods: ALLPlayer - Download - Softonic
Closing your browser tab or restarting the browser is the safest first step.