Try the Firefox Containers preview in Firefox 153. Separate work, personal and other browsing without installing an add-on.

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Firefox 153 introduces native Containers as a built-in browser feature, graduating from the long-standing Multi-Account Containers extension. Containers let users keep separate browsing contexts (work, personal, banking, shopping) isolated from each other, preventing cross-container cookie tracking and ad targeting. The preview allows opening tabs in specific containers, customizing them with names, colors, and icons, and managing settings directly in Firefox preferences. Existing Multi-Account Containers extension users can continue using it alongside the native feature. Mozilla plans to expand functionality and build on this foundation in future releases.

Firefox Containers Preview

Separating browser habits in different isolated containers? That sounds awesome. Finally a way to break ad tracking.

Firefox keeps skipping major Web API features just to focus on useless color tools instead.
<img src="https://static.klipy.com/ii/da290b156d64898341638f3c299e7478/e2/96/5JYul467.gif" alt="GIF">

The Multi-Account Containers extension is probably my favorite Firefox feature, so I’m excited that it’ll become a built-in feature. I believe everybody should be using it to avoid cross-site tracking.
It’s also a great tool for developers if you want to log into multiple accounts at once without needing multiple browsers.
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Not all of the features of the add-on are available in the first-party version of containers just yet
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That’s unfortunate. Hopefully, the remaining features will be implemented soon

In my opinion they also need to to add per window (not global) kiosk mode like chromium has. And that’s a low hanging fruit compared to web API parity, improved developer tools, etc.