Without this mentality, Linux would not exist in its current form, and neither would countless now-amazing open source projects. IMO, the 'fabric' of your comp

Without this mentality, Linux would not exist in its current form, and neither would countless now-amazing open source projects. IMO, the 'fabric' of your computational experience, from the kernel to core utilities like your web browser, email client and IM, should all be open source and possible to trust. Trust, privacy, and security trump gimmicks for a not insignificant number of individuals, and businesses. Vivaldi's USP, in its current state of not being 100% open source, is based upon UX gimmicks. Is Vivaldi a 'good' browser? That is wholly dependent on your threat model and requirements. Vivaldi is not 'the best tool available' if you are concerned about privacy.