Theme unified extension menu

Fixes #569

theme/parts/buttons.css

@@ -39,7 +39,8 @@ button.close,
 .permission-popup-permission-remove-button,
 .button.connect-device,
 #item-choose button,
-#editBMPanel_newFolderButton {
+#editBMPanel_newFolderButton,
+.unified-extensions-item-menu-button {
 	-moz-appearance: none !important;
 	background: var(--gnome-button-background) !important;
 	border-radius: 6px !important;
@@ -64,7 +65,8 @@ button.close,
 .close-icon:not(.tab-close-button),
 button.close,
 #protections-popup-info-button,
-.permission-popup-permission-remove-button {
+.permission-popup-permission-remove-button,
+.unified-extensions-item-menu-button {
 	background: transparent !important;
 	transition: background .3s;
 }
@@ -174,7 +176,8 @@ menulist:hover .menulist-label-box,
 button.close:hover,
 #protections-popup-info-button:hover,
 .permission-popup-permission-remove-button:hover,
-#item-choose button:hover {
+#item-choose button:hover,
+.unified-extensions-item-menu-button:hover {
 	outline: 0 !important;
 	background: var(--gnome-button-flat-hover-background) !important;
 }
@@ -214,7 +217,8 @@ button.close:active,
 #protections-popup-info-button:not(#hack):active,
 #protections-popup-info-button:not(#hack)[checked],
 .permission-popup-permission-remove-button:active,
-#item-choose button:active {
+#item-choose button:active,
+.unified-extensions-item-menu-button:active {
 	background: var(--gnome-button-flat-active-background) !important;
 }
 

theme/parts/icons.css

@@ -352,7 +352,8 @@ button.close::before {
 }
 /* Preferences button */
 #preferences-button,
-.search-setting-button-compact > .button-box > .button-icon {
+.search-setting-button-compact > .button-box > .button-icon,
+.unified-extensions-item-menu-button.subviewbutton {
 	list-style-image: url("../icons/settings-symbolic.svg") !important;
 }
 /* Tabs sync */

theme/parts/popups.css

@@ -157,8 +157,9 @@ panel  {
 
 /* Menu buttons */
 menuitem, menupopup menu,
-panelview .subviewbutton:not(#appMenu-fxa-label2),
+panelview .subviewbutton:not(#appMenu-fxa-label2, .unified-extensions-item-menu-button),
 panelview .toolbarbutton-1,
+panelview .unified-extensions-item-action-button,
 .protections-popup-footer-button,
 .protections-popup-category,
 .identity-popup-content-blocking-category,
@@ -177,7 +178,8 @@ panelview .toolbarbutton-1,
 .identity-popup-content-blocking-category,
 #PlacesToolbar menupopup[placespopup="true"] .bookmark-item,
 .openintabs-menuitem,
-.widget-overflow-list .toolbarbutton-1 {
+.widget-overflow-list .toolbarbutton-1,
+panelview .unified-extensions-item {
 	margin: 0 !important;
 }