My favourite Safari feature is that it in private browsing mode, does not leak cookies between tabs. IOW, I can log in to GitHub in one tab, create a new tab and open GitHub there without it being logged in.

Currently, if I try this with Opera (in private browsing mode), both tabs will be logged in.

Unfortunately, the lack of tab sandboxing prevents me to be able to use Opera as an alternative to Safari

@leocg Right, I did not know that Opera was based off of Chromium. Still, that's no blocker. It is possible for the Opera dev team to upstream such a feature if they are willing to implement it.

My favourite Safari feature is that it in private browsing mode, does not leak cookies between tabs. IOW, I can log in to GitHub in one tab, create a new tab and open GitHub there without it being logged in.

Currently, if I try this with Opera (in private browsing mode), both tabs will be logged in.

Unfortunately, the lack of tab sandboxing prevents me to be able to use Opera as an alternative to Safari