We're sorry to hear that Firefox is crashing when you open it. Please do the following to give us crash IDs that will help us understand more about the crash.

1. Click the Finder' icon in the dock. On the menu bar, click the Go menu, hold down the option or alt key and select Library. A window will open containing your Library folder.
2. Open the "Application Support" folder, the "Firefox" folder, the "Crash Reports" folder and finally the "submitted" folder.
3. Open the 5 most recent files with a text editor and copy the IDs.
4. Paste each ID with bp- into the reply window on the forums.

Thanks in advance!

You can find more information and troubleshooting steps in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

Thank you for the help

Unfortunately, there is no "Firefox" folder in my Library / Application Support folder. There is a "Mozilla" folder but it doesn't contain a "Crash Reports" sub-folder. But I searched for "Crash Reports" and found two folders, one dated Feb. 2022 and one dated Dec. 2022. The Dec. 2022 one has a list of files starting with "InstallTime" followed by a string of numbers. None of the files start with "bp-" but I've added to those characters to the first five numbers and pasted them below.

bp-1582475522 bp-1581631494 bp-1580164578 bp-1579286459 bp-1679006286

Thank you again.