How to completely disable Firefox from auto-starting on a MacBook Air M3?

Hi everyone, I am using a MacBook Air M3 with 8GB of RAM. Due to my workflow, I heavily utilize multiple windows simultaneously across both Brave and Firefox. Unfortunately, this heavy usage has caused my CPU and RAM demand to go through the roof.After doing some research, I was advised to switch back to Safari as my default browser to conserve system resources, and to use other browsers only as secondary tools. To make this transition work, I need to prevent Firefox from automatically launching every time I start up my laptop. I do not want Firefox to open until I explicitly choose to launch it myself. I have searched through every conceivable setting, option menu, and help file, but I cannot find a solution to this basic issue. If I cannot find a way to stop this auto-start behavior, I will be forced to uninstall Firefox altogether, which I would prefer to avoid.How can I definitively stop Firefox from opening automatically on system boot? Thank you for your help.