Screen Recorder 作成者: Dr. Claw

Record your screen, a window or a tab, and save a small video that is easy to share. All processing stays on your device.

Record
- Screen, window or tab, with your microphone if you want it. A level meter shows that the microphone hears you.
- Your webcam as a round bubble in a corner of the video.
- Computer sound (a video, a call, music) from a loopback device, such as Stereo Mix, mixed with your microphone.
- Quality presets with an estimate in MB per minute. The default is up to 1080p at 30 fps, about 15 MB per minute.
- Countdown, pause and resume, live file size and a REC badge on the toolbar button.

After you stop
- Watch the recording before you save it.
- Move the camera bubble to any corner, change its size or hide it.
- Save the recording as it is, or a smaller copy: High 1080p, Medium 720p, Small 480p or Tiny 360p. Each shows its estimated size.
- Save as WebM, or as MP4 where Firefox can encode H.264.
- Saved files have a duration index, so video players can seek in them.

Privacy
- The extension only asks for two permissions: downloads and storage. It cannot read the websites you visit.
- Firefox asks you before it shares your screen, camera or microphone.
- The extension collects no data and sends nothing to any server.

Good to know
- Firefox 130 or later is necessary.
- Firefox does not give tab or system sound to screen sharing. To record the computer sound, set up a loopback device. The instructions are on the support site.
- MP4 copies have Opus sound. Some players, such as Windows Media Player, play them with no sound. Browsers and VLC play the sound.

Open the recorder with the toolbar button or Alt+Shift+R.