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I'm clicking the "sign in to sync" box but getting no response/action. about:preferences?entrypoint=menubar#sync

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Mac OS 10.14.6, firefox 73.0.1. Created my Firefox (Sync) account yesterday on work computer, and edited my bookmarks. Now I'm trying to log in to Firefox Sync on laptop at home, but the "sign in to sync" button doesn't "do" anything or go anywhere. I tried "Tools: Sign in to Firefox" and it goes to the same page with that non-functioning button. I closed and re-opened Firefox; no go. I restarted the machine; not helpful. I was able to log in here, at this support site, but that didn't automatically log in me in Firefox as well; still not able to sign in. Thanks for any advice.