Although Edge’s IE Mode supports Browser Helper Objects (BHO) it does not support IE extensions. The HttpWatch support for IE requires both the use of a BHO and an IE extension.
Unfortunately, this means that HttpWatch will only work in IE 11 - not Edge’s IE mode.
This may be useful for others, what I have found in testing is that is If I set Httpwatch to automatically record / save on exit in the IE11 addin / extension it does record the Edge IEmode launched sites / sessions. I can’t open the Httpwatch window during this session / change setting on the fly but if I need to set anything specific I can change setting in an IE11 window first .
As my application flow goes back and forwards to edge native and IE mode for compatibility it does give me two sets of traces (one edge one IE11) and isn’t ideal, but works for me… and if your whole app / site runs in IEmode it isn’t a problem.
When IE11 goes EoL / gets removed in June 2022 this won’t work (probably…) but may help people work with and investigate issues in IEmode until then.