Firefox 153 contains itself while Thunderbird 153 fixes almost everything

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Mozilla walls off your online identities as MZLA unleashes a bumper repair job

Mozilla released Firefox 153 on Tuesday, closely followed by MZLA with Thunderbird 153 – codenamed "Meadow" for reasons that remain obscure for now.

Firefox 153 is Mozilla's new Extended Support Release (ESR), so it will receive security updates until some time after the next ESR in mid-2027. We covered the highlights of what's new in this version last week.

Firefox 153 will be good news if you used the Multi-Account Containers extension: a preview version of the functionality is now built in. Firefox already has user profiles, which let you keep sets of settings and credentials separate. With some extra effort, you can even launch multiple separate instances of Firefox with different profiles. Containers make similar functionality much easier: each container has its own set of stored credentials. So, for instance, a "home" container could...

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