I was using Firefox to use the Microsoft Office online E1 Licensed ever since I joined my company. It was working without any issues so far but suddenly yesterday in Excel online it showed an error that said we are still loading the workbook and it was not editable. Waiting for hours did not resolve the issue. I should also mention that Firefox is updated to the latest version, sync is on, other workbooks are showing the same error, and I am having no issues with Excel online (same account + same workbooks + new workbooks) in other browsers. Today I tried clearing the cache and online Excel completely broke (screenshot). Please help!