Tested 5-26-20 Linux build. When you try to load this URL, Error loading message shows up. Then, Apprunner will die.

The problem is nsWebShell ReloadDocument and StopLoadingDocument reent libnet and it trash some object on the stack. It seems only have problem if the first block we receive have the whole META tag. (in other word, if we call the ReloadDocument in the first block). I currently work around by don't call StopLoadingDocument in nsMetaCharsetObserver.cpp and use new a implementation of ReloadDocument which use RefreshURL to work aroud the problem so it won't crash now. I will open a new bug against nisheeth about the StopLoadingDocument problem

I verified this in 6-01-12-M7 build.