Firefox's save feature does not work with the sass file

Peace be upon you and the mercy of God and blessings, How are you all, I hope you are fine, my dear brothers, I have a problem in saving Firefox browser to modify the file scss, where I usually when I use a file, css, I enter the tools developers, Edit, then go to style editor, and click save next to the file css, and save, but here in the scss, when you press the Save button, do not save and return the page to its default status !! , Is there a solution to this problem, God willing? , And this video shows the idea more, God willing :

Note: I tried using the --source map and nothing happened

Peace mercy and blessings of God be upon you. Is there anyone here to help?