I assume we're all here to improve, so this is just a recommendation for that.
When I start up Firefox and filter itch.io by Construct 3 games, all the ones I've tried so far work seamlessly, and nothing in the docs or forums I've seen indicate compatibility issues with Firefox (sorry if I missed this being documented somewhere as an issue).
I would start by looking into object pooling or similar patterns to reduce the number of objects or independent textures being created/destroyed every frame.
If you're sure Chrome is going to work fine, then while creating the project, I recommend you do all the testing in Firefox, and the first thing you add that makes it start lagging is where I recommend you start to optimize.