Hi there! Sorry to hear that Frozen Free Fall is crashing as it starts up on your Mac. Let’s get that sorted out together. Just to clarify a couple of things first:

1. Are you running the game as a standalone app on your Mac, or are you playing it through a browser?
2. Have you recently updated the game or your macOS 10.15.7 Catalina?
3. Has this issue started suddenly, or has it been happening for a while?

Knowing this will help me guide you better. Meanwhile, here are a few initial troubleshooting steps that often help with startup crashes on macOS:

1. Force Quit and Restart the Game:
- Click the Apple menu () > Force Quit.
- Select Frozen Free Fall if it’s listed and click Force Quit.
- Then reopen the app.

2. Restart Your Mac:
- Sometimes a clean restart clears temporary glitches.

3. Check for Game Updates:
- Head to the App Store or the platform where you downloaded the game and make sure Frozen Free Fall is up to date. Updates often contain bug fixes.

4. Clear Cache / Preferences:
- Sometimes corrupted game cache or preference files cause crashes. On macOS, this might be found in your user Library folder.
- In Finder, go to Go > Go to Folder... and enter ~/Library/Containers or ~/Library/Application Support and look for a folder related to Frozen Free Fall or Jam City; you can back it up elsewhere and then remove it to clear corrupted data.
- Please be careful here, and if you like, I can guide you step-by-step.

5. Check Permissions:
- Make sure the game has appropriate permissions to run. Go to System Preferences > Security & Privacy > Privacy, and look for any restrictions on the app.

Could you try these steps starting with forcing the app closed and restarting your Mac, and tell me what happens? If the crash continues, I’ll guide you through the next more advanced steps.

Are you satisfied with this initial troubleshooting approach so far?