Canada has a long history of aerial firefighting and the BC Aviation Museum has a row of planes that have a firefighting history. They are lined up outside the hangar and now include the museum’s most recent addition with the Martin Mars that Coulson donated heading the line. There is an S-2 although the example here is not one that was converted for firefighting. However, it does straddle the Canadian military element of the collection and the firefighting role.
Conair has extensive firefighting activities and there are two of their planes on display. An A-26 Invader is there in Conair colours. It was retired quite a while back. Next to it is a more recent acquisition. A Convair CV-580 with a large belly tank modification is an example of the more recent types used in the role. I wonder over time whether something like a Q400 or a BAe 146 will join the collection. Maybe some of the Trackers at Abbotsford could be brought across.