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I logged into one of our vendors for the first time to make some urgent changes. Every third time I tried to click on something, instead of going to that thing, I got an obnoxious full-screen onboarding screen with no way to close it: If I hit my browser&rsquo;s back button, half the time I got a &ldquo;submit this form again?&rdquo; popup. If you really want to thank me because you really value…