I’m running Mozilla 61.0.1 (64-bit) for Linux Mint. It’s about a damned mess. I’m not crazy about Chrome, but it is a better browser.
Me too. Firefox was better before I updated it. Now a lot of things don't work. One thing I learned is to the left of the url address there is sometimes a shield which blocks cookies that track me. If I click on it and disable it I get some functions back. You might try it. When you copy the url and use Chromium you are basically doing the same thing by allowing the cookies to track your web browsing habits. They are mostly used to find out what kind of products you're interested in so they can target the ads on web pages to what you buy.
Then unless you think the better security is needed, try the FF esr.