Considering the amount of files in the installation directory, one could extrapolate the 3rd Party Extensions having their own physical file, that the internal extensions would as well.
So I'd also presume, simply deleting the damn things, if you knew what they were, and then using the debug flag to suppress any probable and inevitable bleating....
It's just very irritating to have a browser that purports to have good customisation and with better resource management, and then stare at a bleeding Tablet function merrily munching memory....it is one of the first Windows services I disable completely still on installs
😑
...and yes yes we have more than enough memory and power these days to not really need to stress aobut 100mb....but...ya.