diff --git a/README.md b/README.md
index 225563c..44b8e8b 100644
--- a/README.md
+++ b/README.md
@@ -152,8 +152,6 @@ You should already have this file installed if you followed one of the installat
 
 > For other non essential preferences checkout `configuration/user.js`.
 
-Also though is not obligatory, some weird issues might happen if you don't use the Firefox's default/system theme because the theme is never tested against the Firefox's light or dark theme.
-
 ## Updating
 
 You can follow the installation script steps again to update the theme.
diff --git a/theme/parts/csd.css b/theme/parts/csd.css
index 97c246a..d05433c 100644
--- a/theme/parts/csd.css
+++ b/theme/parts/csd.css
@@ -151,15 +151,15 @@
 }
 :root[tabsintitlebar] #titlebar:-moz-window-inactive .titlebar-button,
 :root[tabsintitlebar][inFullscreen] #window-controls:-moz-window-inactive toolbarbutton {
-	background: var(--gnome-inactive-tabbar-tab-active-background);
+	background: var(--gnome-inactive-tabbar-tab-active-background) !important;
 }
 :root[tabsintitlebar] #titlebar:not(:-moz-window-inactive) .titlebar-button:not([disabled]):hover,
 :root[tabsintitlebar][inFullscreen] #window-controls:not(:-moz-window-inactive) toolbarbutton:not([disabled]):hover {
-	background: var(--gnome-button-hover-background);
+	background: var(--gnome-button-hover-background) !important;
 }
 :root[tabsintitlebar] #titlebar:not(:-moz-window-inactive) .titlebar-button:not([disabled]):active,
 :root[tabsintitlebar][inFullscreen] #window-controls:not(:-moz-window-inactive) toolbarbutton:not([disabled]):active {
-	background: var(--gnome-button-active-close-background);
+	background: var(--gnome-button-active-close-background) !important;
 }
 
 :root[tabsintitlebar] #titlebar .titlebar-button:where(:hover):not(:hover) {