There is a setting labelled “Always keep these sites active” which can keep your email tab running, but I agree that a context menu item would be better. brave://settings/?search=always%20keep
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I don’t think a manual activation/deactivation option would be a good idea, for reasons I stated in another thread:
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If you have tabs that you don’t use and don’t want to close, you can prevent them loading at startup with this extension: