Bad news for Netflix fans on Windows. Unless you also love Internet Explorer or Microsoft Edge, you aren’t going to get the best resolution for your browser-based Netflix binge.

Microsoft mentioned this little tibdit in a bigger blog post(Opens in a new window) it recently published about video quality and the Microsoft Edge browser. The company’s post starts off talking about how Edge is great for battery life—better than the other “Big Four” browsers (Firefox, Chrome, and Opera) since Edge and Windows work together to keep your CPU in a low-power state during video playback, among other features.

“CPU management in the Windows 10 media stack keeps the CPU running in the lowest power states possible, without compromising UI responsiveness. It is also able to run the display at lower refresh rates during full screen playback of film based content. This saves power by reducing memory bandwidth and improves the quality of film playback by reducing video judder caused by the conversion of the film frame rate (24 Hz, for example) on displays running at 60 Hz. And Microsoft Edge also takes advantage of a feature of the Windows 10 audio stack to offload audio stream processing from the main CPU to dedicated power-efficient audio processing hardware,” Microsoft wrote.

Even more interesting, though, is the fact that Netflix seems to only stream 1080p content to Edge and Internet Explorer. Use another browser, and you’ll be stuck with 720p as the maximum streamed resolution. That’s what Microsoft found on its tests. Of course, Microsoft notes that Edge allowed its test laptops to achieve the best battery performance even though the streams themselves were using a much higher bitrate than you’d find in competing browsers.

Netflix’s documentation(Opens in a new window) also appears to support Microsoft’s claims. In its “System Requirements for HTML5 Player and Silverlight” webpage, Netflix notes that its HTML5 player only gives you 1080p video on Edge or Internet Explorer. (Don’t worry, Mac owners: Safari gets 1080p as well, so long as you’re running OS X 10.10.3 or later.)

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That said, Netflix leaves out the helpful advice that the Netflix app in the Windows store will also render your content in 1080p, so you don’t necessarily have to switch to a new browser if you don’t want to.