Firefox on Ubuntu (which I'm not using anymore for these and other reasons) and presumably on other OSs does exactly that: refuse to open new tabs/sites once every two weeks or so, telling me "one more thing we need to do" ie self-update. So you're loosing all your browsing context, though FF does a better job restoring it after restart than it used to, but still that's user-hostile and self-important as fuck. And there's also a "principal" reason why I can't stand this: that the Web is now 30 years old, past its peak, so if browsers still need to update bi-weekly for new features and experiments, this in combination with lack of browser diversity proves without any shade of doubt there's something very wrong with the incentives for browser development, the Google/Mozilla browser cartel, and the evolution of "web standards".