My FF crashes completely when opening windy.com. Safari just shows the error that people reported earlier in this thread. I have the same problem with Google StreetView. There are numerous reports on the Internet of people having the same problem with the following setup:

• MacBook Pro retina 2012
• macOS Catalina 10.15.7
• latest updates
• Firefox 95.0 (latest) / Safari (latest)
  The issue seems to be related to WebGL as some tinkering with Safari WebGL settings seems to have fixed it for some people:

In the Safari Menu Bar, go to Develop >> Experimental Features >> then check both WebGL 2.0 and WebGL via Metal.
If Develop is not in the Safari Menu bar, go to Safari >> Preferences >> Advanced >> and tick "Show Develop menu in menu bar" down the bottom.

Unfortunately I wasn't able to find any solution for the Firefox.
Here is Mac Cash Info form firefox crash report:

{
  "num_records": 2,
  "records": [
    {
      "message": "abort() called",
      "module": "/usr/lib/system/libsystem_c.dylib"
    },
    {
      "module": "/System/Library/PrivateFrameworks/GPUSupport.framework/Versions/A/Libraries/libGPUSupportMercury.dylib",
      "signature_string": "Graphics kernel error: 0xfffffffb\n"
    }
  ]
}

Quick update: I have installed the latest security updates from apple (2021-008) and it fixed the problem. Now windy and other apps load normally on my mac. Here is what they said in the change log:

Graphics Drivers

Available for: macOS Catalina

Impact: A malicious application may be able to execute arbitrary code with kernel privileges

Description: A buffer overflow was addressed with improved bounds checking.

CVE-2021-30977: Jack Dates of RET2 Systems, Inc.

My FF crashes completely when opening windy.com. Safari just shows the error that people reported earlier in this thread. I have the same problem with Google StreetView. There are numerous reports on the Internet of people having the same problem with the following setup:

• MacBook Pro retina 2012
• macOS Catalina 10.15.7
• latest updates
• Firefox 95.0 (latest) / Safari (latest)
  The issue seems to be related to WebGL as some tinkering with Safari WebGL settings seems to have fixed it for some people:

In the Safari Menu Bar, go to Develop >> Experimental Features >> then check both WebGL 2.0 and WebGL via Metal.
If Develop is not in the Safari Menu bar, go to Safari >> Preferences >> Advanced >> and tick "Show Develop menu in menu bar" down the bottom.

Unfortunately I wasn't able to find any solution for the Firefox.
Here is Mac Cash Info form firefox crash report:

{
  "num_records": 2,
  "records": [
    {
      "message": "abort() called",
      "module": "/usr/lib/system/libsystem_c.dylib"
    },
    {
      "module": "/System/Library/PrivateFrameworks/GPUSupport.framework/Versions/A/Libraries/libGPUSupportMercury.dylib",
      "signature_string": "Graphics kernel error: 0xfffffffb\n"
    }
  ]
}