Hi, I found this bug while using Google Sheets. Normally when sharing a sheet, a popup would appear with options. Instead I now got a popup with only a "loading". Eventually the loading borked out and I got the error "Sorry, sharing is unavailable at this time. Please try again later." After some messing around with deleting cookies and cache, I tried disabling addons. I found out Greasemonkey was the one that was causing the issue.
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