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Firefox has a lot of issues, but maybe we don't have any other option.
(www.bleepingcomputer.com)
A place to discuss the news and latest developments on the open-source browser Firefox
If it works intermittently like that it's probably just crap code, and it will be crap in any browser.
No, it's not intermittent; it's useragent specific. There are a lot of websites that will work fine in Chrome or Edge, won't work properly in Firefox, but will work properly in Firefox when you lie and say you're running Chrome