Mozilla this week released Firefox 66, which by default now blocks all audio and video auto-play.

Other additions and enhancements to Firefox 66 included promised smoother scrolling, search within multiple tabs and clearer warnings of possible security problems on a website about to be rendered on the screen.

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Engineers also patched 21 vulnerabilities, five of them labeled "Critical," Mozilla's highest threat ranking. "Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code," Mozilla reported.

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