Is Mailvelope secure?

https://www.mailvelope.com/en - Link to the extension of Mailvelope
Mainvelope request a lot of permissions, is it safe?

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This depends on your use cases and threat models. If you want to encrypt/decrypt e-mails directly in your web browser, then it is important to consider whether you do this in a trusted environment.

In the worst case, Mailvelope could leak your private keys somehow (e.g., another web browser plugin/addon is able to access them, or it is uploaded to the internet). So you may want to use a dedicated web browser for it. You must protect private keys like every other password.

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