Firefox 153 Enters Beta Testing as the Next Extended Support Release Series

Posted by hanuca on Jun 18, 2026 6:26 AM EDT
9to5linux.com; By Marcus Nestor
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With the release of Firefox 152 rolling out to all supported platforms, Mozilla promoted the next major release, Firefox 153, to the beta channel for public testing, so it’s time to take a look at the new features and improvements.

The big news with Firefox 153 is that it will be the next Firefox ESR (Extended Support Release) series, supported for 15 months with regular updates that coincide with new Firefox releases. Firefox 153 ESR will join the Firefox 140 ESR and Firefox 115 ESR releases, the latter being retired in September 2026.

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