We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.

1. Press the following shortcut to get a Run window: [Windows] + [R]. This should bring up a window that contains a text field.
2. In that text field, enter %APPDATA% and press Enter. An explorer window should open.
3. From that explorer window, double-click on the Mozilla folder, then double-click on Firefox and then on Crash reports. Double-click on submitted.
4. Now, you should see a list of files that contain reports. Go to View > Arrange Icons by > Modified to get the most recent files at the top of the window.
5. Open the most recent 5 files with a text editor and copy the IDs.
6. 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.

In Mozilla Crash Report folder, I see pending folder and several InstallTime files.

I do not see "submitted" folder.

Within pending folder, I see 4 files: bp-5fdfc6-d1ae-431e-ba93-ab018fda5bc5.dmp bp-5fdfc6-d1ae-431e-ba93-ab018fda5bc5.extra bp-574fedb6-d0db-46c9-a141-3200835d492b.dmp bp-574fedb6-d0db-46c9-a141-3200835d492b.extra

vsoy,

Your user agent tells us that you are posting from an iPhone.

• What operating system are you running?
• What Firefox version is installed?

Those .dmp and .extra files in the Pending folder are from crash reports that were created but never submitted,
Since you can't start Firefox in Safe Mode, can you try to create a new profile to see if it opens?

• https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles#w_creating-a-profile