I can confirm that in chrome it accesses only gmail.com and in general we can set access permissions to extensions on Chrome[1], for Ugly Email I can see that a

I can confirm that in chrome it accesses only gmail.com and in general we can set access permissions to extensions on Chrome[1], for Ugly Email I can see that accessing other domains are disabled by default. As for Firefox, the reviews seem to tell otherwise, it's not been updated for over 2 years (same for chrome as well). [1]https://support.google.com/chrome_webstore/answer/2664769?p=enable_extensions&visit_id=637370330398019250-2679455428&rd=1#extensionpermissions https://support.google.com/chrome_webstore/answer/2664769?p=...