Symptoms
- Videos start playing automatically when a page loads
- Sound plays unexpectedly from a background tab
- Autoplay happens even after disabling it once
- Only happens on certain sites, not all
Likely causes
- CommonBrowser's default autoplay setting allows itMost browsers allow autoplay by default unless changed.
- CommonSite-specific permission previously grantedSome browsers let you allow or block autoplay per website, and a past click can stick.
- PossibleVideo ads embedded separately from the main contentAd autoplay can be controlled by different settings than content autoplay.
- Less commonApp or extension overriding browser settingsSome extensions inject their own video players that ignore browser autoplay rules.
What to do
- Open your browser's site settings and find the Autoplay or Media permission section.
- Set the default autoplay behavior to block sound or block autoplay entirely.
- Check for a per-site override on the specific site giving you trouble and change it to block.
- Clear the site's stored permissions if reset options don't seem to take effect.
- Install a reputable ad blocker or content blocker if unwanted ad videos specifically are the issue.
- Update the browser to the latest version, since autoplay controls have improved over time.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.