Each of the aspects you tackle are known and we are working towards improvements in each area. Even myself as a web developer I find things that we are missing

Each of the aspects you tackle are known and we are working towards improvements in each area. Even myself as a web developer I find things that we are missing - I understand your pains here! Break on events and break on XHR is something we really want to have ASAP. I expect these will be among the first ones to land - from the things you mention. Also, make sure you try the new net monitor in Firefox Nightlies.