Private mode doesn't opens maximized.
New window opens in maximized but new private window doesn't, turning on and off privacy.resistFingerprinting in about:config solves the problem but for unknown reasons it happens again.
Opaite Mbohovái (3)
^first image is how it should be (after turning on and off resist.fingerprinting), 2nd image is how it is now.
update on this problem: deleting the xulstore.json file didnt still fixed the issue but i found something related to that file, i found out a piece of extra code thats being added to xulstore.json file that causes this problem and that code is "sidebar-box":{"sidebarcommand":"","style":""},"sidebar-title":{"value":""}}