https://www.forbes.com/sites/daveywinder/2020/04/03/read-twitter-use-firefox-hackers-could-have-stolen-your-dataheres-what-to-do-now/
Twitter Confirms Firefox Data Problem: Hackers Could Have Accessed Your Data - Here’s What To Do Now
If, like me, you use the Firefox web browser to access Twitter from your laptop, you might well be regretting you switched from Apple Safari, Google Chrome, or Microsoft Edge. When I logged into Twitter as part of my early morning routine today, the first thing I was presented with was a message from Twitter with the title of "Important information for Firefox users." That's never likely to be good news, and it wasn't. "We recently learned that the way Mozilla Firefox stores cached data may have resulted in non-public information being inadvertently stored in the browser's cache," it said, confirming my fears. So what, exactly, just happened?