From a quick look at the code, it seems to be doing something similar, except it does it for you. Here's a link to the Firefox bit, where it makes a custom Firefox profile and then injects a certificate into it: https://github.com/httptoolkit/httptoolkit-server/blob/maste...
I haven't seen the source for the .deb package, but in theory it could add a system cert at installation time. I don't know if it does, though.
I haven't seen the source for the .deb package, but in theory it could add a system cert at installation time. I don't know if it does, though.