dontCheckDefaultBrowser.
Enabled=Don't check. Disabled=Do check.
Note: Internally this is stored in the registry as these values:
999001: Enabled
999009: Disabled
| Registry Hive | HKEY_LOCAL_MACHINE |
| Registry Path | Software\Policies\Mozilla\Firefox |
| Value Name | cck.config.dontCheckDefaultBrowser |
| Value Type | REG_DWORD |
| Enabled Value | 999001 |
| Disabled Value | 999009 |