Backed out changeset 37ef0aa2d2b5 (bug 1857298) for causing bc failures on browser_recentlyclosed_firefoxview.js.

browser/components/firefoxview/syncedtabs.mjs

@@ -426,8 +426,6 @@ class SyncedTabsInView extends ViewPage {
         maxTabsLength=${this.showAll ? -1 : this.maxTabsLength}
         @fxview-tab-list-primary-action=${this.onOpenLink}
         @fxview-tab-list-secondary-action=${this.onContextMenu}
-        secondaryActionClass="options-button"
-        ,
       >
         ${this.panelListTemplate()}
       </fxview-tab-list>`;