IMON Exclusion does NOT work : Firefox + Proxomitron

I have an odd issue.

For a particular test setup I need to exlude Firefox (configured to use Proxomitron at 127.0.0.1:8090) and Proxomitron from IMON scanning.

I have added both of those applications to IMON exclusion. I've triple-checked the path/exec is correct.

Still IMON keeps checking those programs web-access, or more accurately, it checks Proxomitron web access, when Firefox accesses net through Proxomitron.

If I use Firefox directly to access net (bypass proxo) then the IMON exclusion list entry for Firefox works and IMON does not check the traffic.

However, if Firefox is configure to use Proxomitron, then the IMON exclusion entry for Proxomitron does NOT work and IMON checks all Proxomitron traffic, even though I don't want it to.

My IMON Setup / HTTP tab is configured as:

Enable HTTP checking : ON
Ports: 80, 3128
Automatically detect HTTP: OFF

Any ideas as how to solve this?

 

Help, any ideas?