Firefox Mini Window: How It Works and When to Use It

A small window, not a separate web app

A Mini Window can look like a lightweight web app, but the key point is that you're not creating or installing anything. You're just viewing existing browser content in a smaller, floating format.

So it works for everyday web pages: articles, search results, instructions, or whatever else you need to reference while you do something else. It isn't limited to one specific type of content.

In practice, "stays on top" is what makes it more useful than keeping a second tab open. You can stay in your main window while the reference remains visible - no constant tab-switching to re-check where you left off.

What it does - and what it does not do

Mini Window is a way to arrange browser content, not a replacement for your operating system's window management. It doesn't turn a webpage into a native desktop application, and it won't magically make a cramped screen easier to read. You still have to choose a size and placement that doesn't make the page harder to use.

Also, it won't be perfect for every site. Responsive pages may rearrange at a narrow width, and pages that rely on interaction might need more room to function well. Treat Mini Window as a focused reference view, then check whether the specific page you care about stays usable at the size you set.

Open an entire tab

In a Firefox version that supports Mini Window:

1. Open the page you want to keep in view.
2. Right-click its tab.
3. Choose Move Tab, then Move to Mini Window.
4. Hover over the new window to reveal its controls, then drag it where you want it.

Your main browser window stays available for whatever you're doing. The page you moved appears in a separate, compact window, so you can refer to it without jumping back to the tab every time.

Open a selected section of a page

If you only need part of a page, select that section, right-click the selection, and choose Move Section to Mini Window, if the option is available. This can be a cleaner setup than keeping the whole page open - especially if the rest of the content isn't relevant.

Still, there's a trade-off. A selection might be too small, awkward, or incomplete once it's separated from the surrounding context. If the selection includes something like a table or interactive controls, test it before making it your default. When the selected content doesn't stand on its own, moving the full tab is usually the safer choice.

Check availability before changing browsers

Feature support changes over time. The rollout was initially described as available in Firefox Nightly while it was still in beta, with plans to move it to stable. That timeline may not match what you have now.

Check the Firefox version installed on your computer and look for the relevant context-menu option before switching to a testing build. Nightly can be useful if you want to try a feature early, but it's less predictable than the standard release. If browser stability matters for work, stick with stable and use Nightly only if you're comfortable testing.

And don't assume that "it exists in Nightly" means "it works the same way everywhere in stable."

Writing and research

Imagine you're drafting a report and using an article for background. In a traditional setup, you switch to the article, find your place, read a passage, hop back to your draft, and repeat.

Mini Window keeps the source visible while you write, which can make the whole process feel less choppy.

That said, it's not a replacement for real source notes. If you're comparing multiple documents or you need to quote accurately, you still need a way to track what you're using. A Mini Window is for viewing convenience - not for managing your research.

Instructions, dashboards and reference tools

Mini Window can also work well for step-by-step instructions while you do the actual work in another tab. The same idea fits with dashboards you check occasionally, recipes while you're cooking, or a search page you want close at hand.

The right fit depends on how you interact. If it's mostly read-and-check, a floating window can help. If you need to edit complex forms, juggle lots of controls, or compare large tables, a full browser tab may be the better choice.

Smaller displays and Stage Manager

On a laptop, screen space is the limiting factor. A secondary window can easily start crowding out the task you care about. Use Mini Window for the smallest amount of information that still helps, and place it away from the area you're actively working in. If it covers important controls or forces you to shrink your main window, it may not save time.

On macOS, it may also help with macOS Stage Manager, where your window arrangement can affect what stays prominent. A floating reference can remain available while the main browser window stays in use. Still, the payoff depends on your display and your Stage Manager setup - more like a workaround than a universal upgrade.

A quick test for whether it belongs in your workflow

Before you adopt it, ask yourself:

• Do I need to check this page more than once during the task?
• Can I understand it at a smaller size?
• Will keeping it visible reduce tab switching without getting in my way?
• Is the information stable enough to leave open, or will I need to interact with it often?

If it's a recurring reference and it stays readable in a compact window, it's probably worth trying. If you need a broad view or constant interaction, a normal tab (or a full-size second window) is likely the better move.

Choose by the task, not by the feature list

This table is a workflow comparison, not a claim that one browser is simply "better." If your main need is floating video, Chrome already has a focused option. If you want arbitrary webpage content to stay visible, Firefox's Mini Window approach matches the job more directly.

Consider the operational trade-offs

A floating window can cut down on context switching, but it also adds another thing to manage. It can cover content, compete with notifications, or make a small display feel busier.

It can even tempt you to keep too many references open at once. At some point, the "help" turns into clutter, and you're back to wasting attention - just in a different way.

There's also the release-channel angle. Trying the feature in Nightly gives you earlier access, but it comes with the risk of running a less stable build. For a personal test, that can be fine. For a machine you rely on for client work or production tasks, wait for the feature in your preferred release - or test it separately.

If you want a simple rule: use Mini Window for recurring visual references, Picture-in-Picture for floating video, and a normal (or app-style) window when you need more space or sustained interaction. That tends to be more useful than arguing about which browser has the longer feature list.