Very much agree.
I'd argue that while enabling Power Saver automatically on battery power should be an option, it should be opt-in because it modifies background tab behaviour.
Latest posts made by julesmazur
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Suggestions and feature requestsRE: Automatically enable power saver on battery power
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Opera for MacU2F/Yubikey support in Opera 38+
Are there any plans to integrate support for Yubikeys and other U2F devices in Opera?
Currently, this functionality is only supported in one of the major browsers – Chrome. Bringing this functionality to Opera would reduce user dependence on software-based TOTP applications like Google Authenticator, which are available on smartphone OSes and not always the best 2FA method.
Expected behaviour
A FIDO U2F device can be registered and used with online services as a second factor for authentication.
Current (actual) behaviour
Upon trying to register a Yubikey as a second factor for a Google account, a message pops up stating "Extension not installed." The registration process is interrupted.
Other background information and resources
Multiple online outlets, including a FAQ page on Yubico's website, mention that only Chrome supports Yubikey as of this writing.