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When recording videos using Firefox, keep in mind that playback on Safari may be sluggish. This will be more notable if you are recording high screen resolutions and/or both screen and webcam video.

If your audience is using Chrome, Firefox or Opera to watch the videos you are creating, there will be no negative effect for Firefox videos.

Note that on iOS, all browsers are using Safari for rendering, so all iOS devices are affected by that limitation. Also note that this will affect battery usage during playback.

So if you expect your audience to watch your videos on Mac OS Safari or on iOS devices, consider using Chrome for recording. 

The reason for this is that Safari has no native support for the video codecs supported for recording on Firefox. Therefore, Safari needs to software-decode videos recorded using Firefox.

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