add "tweaks" customisation

chrome/userChrome.css

@@ -7,22 +7,4 @@
 @import url("toolbar/urlbar.css");
 @import url("global/colors.css");
 @import url("global/popup.css");
-
-/* tweaks */
-
-/* disable drag space above tabs */
-/* :root #titlebar {
-  --tab-block-margin: 0px !important;
-} */
-
-/* force tabs to toolbar bg (useful for proton themes) (might experience some
-bugs with certain themes eg. dark text on dark background.) */
-:root {
-  --lwt-selected-tab-background-color: unset !important;
-}
-
-/* hide firefox account button when not in private mode (useful as a private
-browsing indicator) */
-/* :root:not([privatebrowsingmode]) #nav-bar:not([customizing]) #fxa-toolbar-menu-button {
-  display: none !important;
-} */
+@import url("global/tweaks.css");