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When I try to log on to my FireFox Sync, a red box that reads "Working..." appears. It stays in this state, and it will not log in. How do I resolve this issue?

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I've used FireFox for a long time, and the Sync feature has always worked for me before. I have the latest and greatest version of FireFox. I have a FireFox Sync account. For some reason, a few weeks ago, when I tried to log on, it would just sit there and then a red box saying "Working..." would appear. I left it, and went out. I returned over an hour later, and the red box was still there "Working..." I refreshed the page, and I still was not logged in to my Sync account. I restarted FireFox, but that didn't help. I restarted the computer. No help. I tried to update FireFox, but I was already using the latest version. I updated Windows10, but that didn't fix it either. I went into my FireFox setting and told FireFox to forget my E-mail for Sync. Then, I tried logging in again, but that didn't work either. I don't know what's wrong with my Sync account. How do I resolve this issue?

I've used FireFox for a long time, and the Sync feature has always worked for me before. I have the latest and greatest version of FireFox. I have a FireFox Sync account. For some reason, a few weeks ago, when I tried to log on, it would just sit there and then a red box saying "Working..." would appear. I left it, and went out. I returned over an hour later, and the red box was still there "Working..." I refreshed the page, and I still was not logged in to my Sync account. I restarted FireFox, but that didn't help. I restarted the computer. No help. I tried to update FireFox, but I was already using the latest version. I updated Windows10, but that didn't fix it either. I went into my FireFox setting and told FireFox to forget my E-mail for Sync. Then, I tried logging in again, but that didn't work either. I don't know what's wrong with my Sync account. How do I resolve this issue?