#context_openANewTab,
#context_openANewTab + menuseparator,
#context_openANewTab_separator,
#context_reloadTab_separator,
#context_reloadTab + menuseparator::before {
   display: none !important;
}

menuseparator,
#context_openANewTab {
   display: none !important;
}

Hi All, I would like to hide the "New Tab to Right" option on the Tab Context Menu, and also remove the separator line right below that menu item. The first line in the following code removes the Menu Item, but none of the 4 remaining lines succeed in removing the separator line. It remains at the top of the menu (see attached image). Could anyone suggest some code to also remove the separator line at the top? This is in FF 135. Thank you. #context_openANewTab, #context_openANewTab + menuseparator, #context_openANewTab_separator, #context_reloadTab_separator, #context_reloadTab + menuseparator::before { display: none !important; } This code below removes the first menu item and ALL separators from ALL menus, which is "ok" but not optimal. menuseparator, #context_openANewTab { display: none !important; } This solution provided by cor-el a few years ago appears to no longer work (the separator remains): https://support.mozilla.org/nl/questions/1340761

#context_openANewTab,
#context_moveTabToNewGroup,
#context_moveTabToGroup,
#context_ungroupTab + menuseparator {
   display: none !important;
}