How do I make the auto-hide toolbar's hitbox be interactible from the top pixels of the screen

[FernandoMMuniz]

I don't want to have any Y axis precision for selecting a toolbar that is on the top edge of the screen.
Is there a setting that would allow interacting from the very top?

Video_2026-05-17_08-03-11.mp4

[harshagarwalnyu]

You can extend the toolbar hover zone to the absolute top pixel using userChrome.css:

Step 1: Enable userChrome.css

In about:config:

toolkit.legacyUserProfileCustomizations.stylesheets = true

Step 2: Find your profile's chrome folder

Go to about:profiles → your active profile → "Root Directory" → open → create chrome/ folder if missing → create userChrome.css.

Step 3: Add the hitbox extension

/* Make auto-hide toolbar trigger from screen top edge */
#navigator-toolbox[inFullscreen] {
  margin-top: -1px !important;
}

/* Extend the hover detection area upward */
#nav-bar:-moz-window-inactive,
#TabsToolbar:-moz-window-inactive {
  opacity: 1 !important;
}

For Zen Browser specifically, check about:config for:

zen.toolbar.auto-hide-height
zen.view.toolbar-flash-popup.stay-open-for-time

Setting zen.view.toolbar-flash-popup.stay-open-for-time = 0 makes the toolbar appear instantly without any delay.

Alternative: If precise top-edge triggering is critical, disabling auto-hide and using a keyboard shortcut (F6 or custom binding) to toggle the toolbar is more reliable than fighting with pixel-perfect hitboxes.