Based on what I know, The use of blue lights in Ontario is restricted to Law Enforcement and Municipal Snow Removal vehicles.
I work with Military Police in here in Ottawa and asked, they recommended that you either cover the lights or disconnect them from power to prevent accidental activation. Also, keep your identification handy so that the OPP will not bother you so much.
Also, if your plates are tagged as being a VFF, they can see that in the system when they look up your plates (I assume). In Quebec (my province), VFFs are allowed to have blue/red lights on their vehicles if they are en route to their station or emergency scene. But only if they're in their service area.