I'm also on a system with 8Gb of ram at the moment. Firefox is using up a hilarious 4.6Gb keeping a few dozen web pages open, but the entire rest of my Linux sy

I'm also on a system with 8Gb of ram at the moment. Firefox is using up a hilarious 4.6Gb keeping a few dozen web pages open, but the entire rest of my Linux system, including Inkscape, qCAD, and SketchUp under Wine are using only a combined 907 megabytes. So it's possible part of your problem is just Windows 10.