Firefox initially popped open a window stating that I already had another copy open and so wouldn't open. After some investigating, I found a fix and followed the steps to delete profiles - possibly the cause of the errors. (I had applied this solution once months ago and it had worked then.) Subsequent to this attempt, I was unable to open Firefox - even with the creation of new profile(s). Given the situation, I deleted Firefox entirely by dragging into Trash and emptying the trash and re-logging in. Downloaded a clean new install from the Mozilla website. Although the DMG file downloaded fine, when I attempt to copy app to Applications folder, the system hangs. So now there is no way to re-install Firefox?!

This link /post seems to reflect my condition: https://support.mozilla.org/bm/questions/1240427However at the given location on my computer, I only had a FB video plugin - even after i deleted that, there is no change, i.e. remain unable to implement a fresh new install of Firefox.

Changes introduced with macOS 10.15 (Catalina) cause certain Java applications to behave incorrectly. Therefore, we cannot certify any JDK version on macOS 10.15 yet. However, as of now, you can install and run non-notarized software on macOS 10.15 systems by modifying your security preferences. Detailed information and steps are available here. Discussion Won't Install macOS Catalina Author Date within 1 day 3 days 1 week 2 weeks 1 month 2 months 6 months 1 year of Examples: Monday, today, last week, Mar 26, 3/26/04.

Apple on Monday released macOS Catalina to the public, allowing everyone to install the newest version of the operating system for the Mac. Based on reports on the MacRumors forums, Twitter,. MacOS has now been updated to 11.0, and many Mac users are trying to upgrade to the newest version. While for most it's a usual pleasurable experience, for some this update had downsides. Some users complain that their Mac computers won't boot after installing new macOS Big Sur/Catalina. When Mac fails, it usually can't boot or start up properly.

Suggestions?Thanks!RT12

Mac Won't Install Catalina

p.s. Using a different computer to post this. When I get a chance, I'll go back to the one with this issue and see if I can post the 'troubleshooting information'.