Hi I have this code that works well as long as i don't add or remove addon's icons.. but i can't always tweak it till it fits the size because i removed or added a new addon's icon.. #PopupAutoCompleteRichResult { margin-left: 0 !important; max-width: 1503px !important; } I need the navigation bar submenu to follow the urlbar at the same exact length. My css is just adapted to the number of icons in the navigation bar.. & isn't a definitive solution. i'd need either a userscript or addon if it exists. i doubt a userstyle would help.. but why not if the urlbar submenu follows the length of the urlbar perfectly, adding or removing icons too.