To use these add-ons, you'll need to download Firefox.

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Iceggiren i Screen Recorder

Screen Recorder sɣur Bernard

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Icegger-it Li Ze Xian
sɣur Li Ze Xian, pred 3 rokmi
The extension does not support seekable WebMs. I think their web application supports this.

The tradeoff for the web application is that it only supports fullscreen recording.