All Settings/Preferences

FF Ultima applies all of its features by filtering through user preferences (example: ultima.navbar.autohide) found on the about:config page. This allows You, the User, a bit of freedom in how you use the theme. Combining different preferences can achieve multiple layouts and interesting results. Below is a list of every setting found in the theme. Click on them ► to view details.

To access theme settings:

Open Firefox
Type about:config in the URL Bar
Type ultima or user.theme and...

Tabs
Side bar (not Vertical Tabs)
Top bar(s) (menubar, navbar, window controls)
URL bar
Alternative Style's (icons, colors, spacing)
Custom Wallpapers
Useful Settings (You may want!)
Looking for color scheme settings? ->
Looking for transparent theming? ->
Looking for adaptive tab color? ->

Tab Settings

tabs vertical or horizontal

This is not a "setting" but an "action" that most users may find helpful.
Right click any toolbar -> Turn on/off Vertical Tabs
Open the Settings Sidebar -> Turn on/off Vertical Tabs

https://github.com/user-attachments/assets/ba5f1e26-4ca9-4cdc-882f-b937c7ab660c

autohide vertical tabs

This is not a "setting" but an "action" that most users may find helpful.
Open the Settings Sidebar -> Turn on Expand sidebar on hover
By default Firefox turns this off whenever you go horizontal.

https://github.com/user-attachments/assets/fb36e5e9-50b7-4c1d-9536-3ce43f72c65a

ultima.tabs.belowURLbar

When using horizontal tabs, toggle between tabs on top, or tabs under the urlbar

https://github.com/user-attachments/assets/12a4cf26-a686-4a54-9fd2-216fafa132ac

ultima.spacing.compact.tabs

On by default.
This reduces the spacing between vertical tabs, you can see more tabs on your screen at once.

https://github.com/user-attachments/assets/96027739-de0c-4be1-bb47-ee3d367c2302

ultima.tabs.closetabbutton.on.icon

Hovering over a tabs icon will present the "close tab" button.

Vid_20250728_233140

ultima.disable.alltabs.button

This hides the all tabs button that is always on the Navigation Bar.

disablealltabs

ultima.tabs.disable.update.dot

HIDE THE UPDATE DOT THAT APPEARS ON UNSELECTED TABS

ultima.tabs.always.show.pinned

Restore unlimited size (height) to the pinned tab container. Reverting recent firefox change. ...

ultima.tabs.vertical.hide ➕ ultima.tabs.vertical.hide.in.screencorner ➕ ultima.tabs.vertical.hide.in.screenedge

Hide vertical tabs completely (great for Sidebery setups)
or hide them in at the bottom corner of screen
or hide them in the screen edge

https://github.com/user-attachments/assets/20241a30-a7c5-4430-a6b5-ad65433005f9

Important:

For stability, ultima.tabs.vertical.hide is reliant on ExpandonHover being ON. This allows a consistent experience accross the browser, whether in private browsing, or a different OS.

Expand ON Expand OFF

ultima.tabs.newtabbutton.ontop.1 ➕ ultima.tabs.newtabbutton.ontop.2

1 - NEW TAB BUTTON ON TOP
2 - NEW TAB BUTTON UNDER PINNED TABS

https://github.com/user-attachments/assets/f4fa2ffd-49cb-4aea-b8d0-0e2eb2bdd502

ultima.tabs.tabgroups.label.1 ➕ ultima.tabs.tabgroups.label.2 ➕ ultima.tabs.tabgroups.background

Style the label for your tab groups (choose 1)

https://github.com/user-attachments/assets/7993504b-6599-4d5e-b1c3-f8d029cb2eb6

Style the background for the tabs in your tab group. (backgrounds can be combined &/or seperated)

tabgroups

ultima.xstyle.containertabs.i ➕ ultima.xstyle.containertabs.ii ➕ ultima.xstyle.containertabs.iii

CHOOSE ONE OPTION

tc1 tc2 tc3

https://github.com/user-attachments/assets/9fa05514-6477-4dff-bd78-e050bf89f857

ultima.tabs.vertical.hide.the.bottom.button ➕ ultima.tabs.vertical.hide.the.bottom.buttons.off.hover

CHOOSE ONE.
hide.the.bottom.button will hide all action buttons at the bottom of vertical tabs (except for Settings)
hide.the.bottom.buttons.off.hover will hide all action buttons (except for Settings) until you hover over the vertical tabs

Vid_20250529_174426

Vid_20250529_180401

ultima.tabs.multiline.labels

Tabs can span multiple lines. This setting is quirky.. but also stable and a personal favorite. Only works with vertical tabs.

Vid_20250817_021240

ultima.tabs.closetabbutton.on.icon

The close tab button x sits on top of a tabs icon when hovered. Works on both horizontal and vertical tabs.

Vid_20250728_233140

ultima.tabs.reverse.content.order

This setting simply reverses the order in which things appear in a tab. Close button first, label second, icon last. Here's an example of it in action, with multiline tabs.

user.theme.xtras.tab.outline.color

You can specify a tab outline color by typing in a color (or gradient). Leave empty for no outline.

Vid_20250901_151025

Sidebar Settings (not Vertical Tabs)

ultima.sidebar.autohide

AUTOHIDE ALL SIDEBARS (NOT VERTICAL TABS)

https://github.com/user-attachments/assets/bbd5cd62-b29c-41cd-b1db-ea463abcedc8

ultima.sidebery.autohide

AUTOHIDE JUST SIDEBERY, ALL OTHER SIDEBARS REMAIN FULLY EXPANDED

https://github.com/user-attachments/assets/951ce0d7-4d21-4f72-92c3-b6b6667354c4

ultima.tabs.vertical.hide ➕ ultima.tabs.vertical.hide.in.screencorner ➕ ultima.tabs.vertical.hide.in.screenedge

Great for SIDEBERY ONLY setups. Hide vertical tabs completely, or at the bottom screen corner, or within the screen edge.
This allows the Sidebar to also overlay browser content instead of pushing it to the side.
For this to work, please have expandOnHover on as well.

https://github.com/user-attachments/assets/20241a30-a7c5-4430-a6b5-ad65433005f9

Important:

For stability, ultima.tabs.vertical.hide is reliant on ExpandonHover being ON. This allows a consistent experience accross the browser, whether in private browsing, or a different OS.

Expand ON Expand OFF

ultima.sidebar.seperator

SEPERATES BOTH THE SIDE BAR AND VERTICAL TABS TO OPPOSITE SIDES OF BROWSER

https://github.com/user-attachments/assets/537f41b0-f43f-466f-b24c-dc8519c99f46

ultima.sidebery.expandon.inactive.windows

WHEN USING SIDEBERY AUTOHIDE, IT WILL REMAIN EXPANDED WHEN THE FIREFOX WINDOW IS INACTIVE

https://github.com/user-attachments/assets/ba481ce4-957a-4c06-a198-ce239be939f9

user.theme.xtension.sidebery

Sidebery will automatically adapt to Color Scheme colors

ultima.sidebar.hide.header

Hides the new (firefox 140) sidebar header ...

ultima.sidebar.revamped.hide.when.horizontal

Hides the new revamped sidebar when using horizontal tabs ...

Top bar Settings

ultima.navbar.autohide

Autohide the navigation bar
It remains visible when the url bar is focused, or interior element menupopups are focused

https://github.com/user-attachments/assets/998fb2ef-3eca-4d0a-ab2e-76dec44cc15f

ultima.navbar.float

Like navbar autohide, this autohides the navigation bar, in a floating style

ultima.navbar.hidebuttons

Hide the buttons on the navigation bar when not hovered
When panels like the menu, extensions, or downloads are triggered/focused/downloading those specific buttons will remain visible until not focused d82e1cc

navbar hide buttons

ultima.navbar.windowcontrols

THEME WINDOW-CONTROLS LIKE STANDARD TRAFFIC LIGHTS OR CARL TRAFFIC LIGHTS BELOW

standard traffic lights on Windows
carl themed traffic lights on Linux

ultima.navbar.bookmarks.autohide

AUTOHIDE BOOKMARK BAR, WITH COLOR SCHEME MATCHING VISUAL

https://github.com/user-attachments/assets/ab5fc9d5-0114-4ba9-8d07-4fbc8b27b541

ultima.navbar.bookmarks.position

This setting controls the positioning of the bookmark toolbar items, from left to center to right.
Position "right", only really applies for a floating bookmarks toolbar.

Vid_20250822_014402

https://github.com/user-attachments/assets/00f8dee9-64dc-4c7f-8531-0c856c78d6db

ultima.navbar.bookmarks.scrollable

Makes the bookmarks toolbar scrollable
Through scrollbar dragging, shift + scroll, or mouses that support horizontal scrolling

ultima.navbar.bookmarks.float

Bookmarks bar becomes a detached floatable bar with ultima.navbar.bookmarks.float
It can be positioned and used in multiple layouts when used in combination with the other "navbar.bookmarks." settings
It is disabled when using navbar.float, since they achieve the same purpose.

ultima.navbar.windowcontrols

Custom window controls such as:
ultima.navbar.windowcontrols.carl
ultima.navbar.windowcontrols.trafficlights
ultima.navbar.windowcontrols.whiteout

ultima.disable.windowcontrols.button

HIDE WINDOW CONTROLS (- O X)

disablewincontrols

ultima.disable.alltabs.button

disablealltabs

ultima.navbar.theme.extensionspanel

themeextensions

Content Area Settings

ultima.scrollbar.thin

Forces a more thin scroll bar for content areas, very useful when combined with Windows 10. By @ mrodyhin

ultima.spacing.compact

Removes borders, rounding, shrinks tabs by a tiny percentage

https://github.com/user-attachments/assets/22489b0c-3b99-48ed-897b-e2926e6672bd

ultima.spacing.relaxed

More "comfy" spacing between browser content, goes well with Side View extensions and Ultra-Wide displays

Screenshot_20250520_225549

ultima.spacing.compact.contextmenu ➕ ultima.spacing.relaxed.contextmenu

Spacing of context menu items
Mac OS needs to use firefoxes gtk context menu widget.macos.native-context-menus
Mac OS Users should use the gtk context menu, because it matches FF Ultimas theme.

context menu spacing

ultima.xstyle.newtab.rounded

MAKE ELEMENTS ON THE NEW TAB PAGE MORE ROUND

new tab rounded elements

ultima.xstyle.private

Private Window Home Page: Strong purple background removed, text removed. Less is more sometimes.

ultima.spacing.compact.addonmanager

Makes the addon manager & themes page a compact grid layout

compactaddon

URL bar Settings

ultima.urlbar.centered

This centers the text within the urlbar. To center the urlbar itself, just use spacers on the customize toolbar page.

https://github.com/user-attachments/assets/c7c8efde-e693-40f7-bc8a-b6fea94f578b

ultima.urlbar.float

URL BAR becomes a floating transition when in use

https://github.com/user-attachments/assets/f0c7744a-f527-4025-b300-191922babacb

ultima.urlbar.hide.buttons

This hides the buttons within the urlbar, off hover

https://github.com/user-attachments/assets/f7233ffa-1deb-4ab5-b324-40575555ed3f

ultima.urlbar.hide.searchsuggestions

This hides the "This time search with" url bar suggestions, when used with the new "bonnet" switcher, it hides that.

ultima.urlbar.transparent

TRANSPARENT URL BAR

ultima.urlbar.animate.options

just a visual slide of selected options 8cfb8aa

Alternative Style Settings

ultima.spacing.compact

Removes borders, rounding, shrinks tabs by a tiny percentage

https://github.com/user-attachments/assets/22489b0c-3b99-48ed-897b-e2926e6672bd

ultima.spacing.relaxed

More "comfy" spacing between browser content, goes well with Side View extensions and Ultra-Wide displays

Screenshot_20250520_225549

ultima.spacing.compact.contextmenu ➕ ultima.spacing.relaxed.contextmenu

Spacing of context menu items
Mac OS needs to use firefoxes gtk context menu widget.macos.native-context-menus
Mac OS Users should use the gtk context menu, because it matches FF Ultimas theme.

context menu spacing

ultima.xstyle.newtab.rounded

MAKE ELEMENTS ON THE NEW TAB PAGE MORE ROUND

new tab rounded elements

ultima.xstyle.private

Private Window Home Page: Strong purple background removed, text removed. Less is more sometimes.

user.theme.xtension.swap.addon.colors

If an add-on theme isn't matching theme colors to well, this will swap some of the color variables of the theme around

ultima.spacing.compact.addonmanager

Makes the addon manager & themes page a compact grid layout

compactaddon

ultima.spacing.compact.menus

for a more compact menu panel / extension panel

ultima.disable.contextmenu.icons ➕ ultima.disable.contextmenu.icons.all

to disable the icons in context menus

Using Custom Wallpapers

user.theme.wallpaper

USE ANY COLOR SCHEME WALLPAPER, already found in the source. Try to only have one selected.

https://github.com/user-attachments/assets/f2d564fb-5382-4696-a219-660c6b96c8ae

Useful Settings (You may want!)

browser.tabs.groups.enabled to use the new tab grouping feature, categorize, seperate and collapse tabs in groups!
toolkit.tabbox.switchByScrolling to switch between tabs via scrollwheel
browser.newtabpage.activity-stream.newtabWallpapers.v2.enabled to set more custom New Tab Page wallpapers
browser.tabs.hoverPreview.enabled view an image preview of a hovered tab
browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar to disable the New Tab Page search bar