heres a few general ones. on my linux computers i have a bash script to install firefox, then it sets up symlink of the user.js file from my own config folder to the default .config folder. on windows i just manually add it

  user_pref("browser.aboutConfig.showWarning", "false");    // disable about:config warning
  user_pref("browser.startup.page", 3);    // restore previous session
  user_pref("browser.ctrlTab.sortByRecentlyUsed", "true");    // cycles tabs in recently used order
  user_pref("signon.rememberSignons", "false");    // dont ask to save passwords
  user_pref("browser.search.suggest.enabled", "false");    // disable address bar suggestions
  user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", "true");    // enable custom css

this is the only css i could find that i like since it keeps the window controls as well, although since a recent update, theyre just showing as a white box now but they still works https://github.com/mbnuqw/sidebery/issues/458#issuecomment-9...