Do Son 
Mozilla has published Firefox 153.0 as a stable release, and the update finally delivers containers as a native capability. Until now, users had to install a separate add-on to enjoy the same convenience. Containers isolate accounts and identities, and they curb tracking between separate browsing contexts. Moreover, nobody needs to maintain several browser profiles anymore.
Why Mozilla Folded Containers Into the Browser
Mozilla had already shipped an official Multi-Account Containers extension. Through that add-on, people could keep work, personal, and privacy-sensitive browsing neatly apart. As a result, they avoided installing several browsers or juggling multiple Firefox profiles.
The feature proved genuinely useful. However, the add-on requirement felt like a needless hurdle. Many users told Mozilla that a built-in version would simply serve them better. After weighing that feedback, the organisation wove the capability straight into the browser. The official Firefox Containers preview announcement lays out that reasoning in detail.
What Container Tabs Actually Do
The practical value depends entirely on how you browse. Still, two scenarios cover most people.
Running Several Accounts at Once
Imagine you hold multiple social media accounts. You can sign in to each one inside its own container. Consequently, each container guards its own cookies and browsing data. Furthermore, no container can read what another container stores.
Drawing a Line Between Work and Life
Office machines usually carry work-related browsing. Occasionally, though, you need to check something personal. In that case, simply open a personal container and sign in with your own account. Your data then syncs through that account as usual.
How to Use Native Containers in Firefox 153
Finding the New Settings
Firefox 153 ships this capability as a preview. After upgrading, head to Settings, then Tabs and Browsing, then the identity settings. There you can add a new identity or pick one of the presets.
Please note one caveat. The rollout is gradual, so not everyone will see the option immediately. If the identity settings never appear, install the Multi-Account Containers add-on as a temporary substitute.
Shaping Each Container to Taste
Once the feature is live, opening a new tab prompts you to pick a container. Afterwards, a matching badge appears at the right edge of the address bar. Meanwhile, the settings panel lets you rename each container freely. You can also assign a distinct colour and icon, which makes every context instantly recognisable.
Why This Release Matters
Container isolation blunts a common tracking technique. Advertisers stitch identities together by reading shared cookies across sites. Containers sever that thread, because each one keeps its own cookie jar.
Therefore, this change turns a niche power-user trick into an everyday privacy control. Ordinary users gain protection without hunting through the add-on catalogue. That shift alone makes Firefox 153 worth installing.
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