Constant "Address Not Found" for well known major sites: SO Done w FFox.

Constant "Address Not Found" for well known major sites: SO Done with Firefox For Android browser app. Even though I've promoted Firefox for years. Also, I strongly dislike not being able to find a HELP CONTACT email address to get a fix for this FREQUENT problem, because I would prefer to avoid taking my persistent (years long) problem with Firefox for Android to the public, or to the Google Play Store Reviews, and I would rather just get a fix for the constant problem, a fix which I am unlikely to get in some Google-like online user community. So much wasted time under Deadlines from authorities. The deadlines, problems, and crises surround me. Exasperated. My old building suite doesn't have the fastest ethernet and wifi. This Firefox For Android problem wastes even more time. Frequently. The SAME site addresses are a piece of cake to visit in any of my cell phone's 3 Google browsers. But I do not believe in Google. Firefox For Android is my preferred default browser. (Usually using DuckDuckGo search engine, inside my Firefox for Android browser.) Help?! 😢