After years, I changed my default browser to Firefox instead of Safari. However, in spite of my careful searching and attempts to solve my problem(s) with preferences and reading help FAQs, I am unable to resolve the main issues. I am unable to go to LinkedIn, either my own page or anything else in Firefox. It goes to the page and remains stuck trying to log in. I can copy the url address and paste it into my Safari browser bar and all proceeds as it should ad I get logged in, etc. There is also an issue with my NYT digital account. Sometimes Firefox acts normally, signing me in and allowing me to read articles and so forth. But often, capriciously I would say since it makes no sense at all it will arrive at the lage and for an instant I'll see the article, or video, and then the page will go blank. Reloading produces the same result and I am unable in Firefox to see the content. If I go to the content on Safari, all is fine. I am seriously considering returning to Safari as my default browser. What is going on here? Thank you.