Firefox Themes (2026): 10 With the Most Daily Users

A Firefox theme recolours your toolbar, tabs and menus, and some put artwork or a moving background behind them. You add them from Mozilla's own add-ons site, and the ten here are the ones with the most daily users there. Three come from Firefox itself, and the other seven are by independent creators.

They're listed alphabetically and in no particular order. Each description is a plain version of the theme's own listing, and none of them is a recommendation on its own. If it's dark mode you're after, my guide on how to switch Gmail to dark mode does the same job for your inbox.

How these Firefox themes were picked

Every number on this page comes from the Mozilla Firefox Add-ons site (addons.mozilla.org): daily users, average rating, rating count and last updated date, all as of Oct 2026. The ten are the themes with the most daily users there. Mozilla counts daily users, not downloads, so that's the word I've used. The free plan column says Not stated because none of these listings names a plan, which is what the column records.

Tool	Type	Good for	Free plan
Activist Balanced	Colourway theme, offered by Firefox	A calm colour scheme from Mozilla's own set	Not stated
Ash	Colourway theme, offered by Firefox	A cool, quiet grey look	Not stated
Biscuit	Static theme, independent artist	A simple look with a short listing	Not stated
Black	Static theme, independent artist	An all-black browser	Not stated
Dark space	Animated theme, independent artist	Moving stars on a dark background	Not stated
Nyan Cat (Animated)	Animated theme, independent artist	A playful animated cat	Not stated
Praise the sun (animated)	Animated theme, independent artist	A Dark Souls fan art nod	Not stated
Purple Night Theme	Static theme, independent artist	A purple night-time palette	Not stated
Spirited Away (Animated)	Animated theme, independent artist	Chihiro and Haku from the film	Not stated
Visionary Balanced	Colourway theme, offered by Firefox	A balanced colourway from Mozilla	Not stated

Ten Firefox themes with the most daily users

Activist Balanced

Best for: People who want a theme straight from Mozilla, in a balanced colourway pitched at those who leave the world better (313,807 daily users as of Oct 2026).

Ash

Best for: A cool, quiet grey from Mozilla's own theme set, for anyone who wants the browser to fade into the background (281,449 daily users as of Oct 2026).

Biscuit

Best for: Trying a simple theme from an independent creator whose listing says little, so you judge it on looks alone (25,910 daily users as of Oct 2026).

Black

Best for: Keeping the whole browser black, from an independent creator, if you want the darkest look on this list (25,727 daily users as of Oct 2026).

Dark space

Best for: An animated dark theme with stars and particles drifting behind your tabs, from an independent artist (98,442 daily users as of Oct 2026).

Nyan Cat (Animated)

Best for: Something playful: an animated Nyan Cat in your toolbar from an independent creator (26,897 daily users as of Oct 2026).

Praise the sun (animated)

Best for: Dark Souls fans, with an animated theme whose listing credits the fan artists behind the artwork (29,834 daily users as of Oct 2026).

Purple Night Theme

Best for: Night owls who like purple, from an independent creator whose theme has stayed popular for years (22,476 daily users as of Oct 2026).

Spirited Away (Animated)

Best for: Fans of the film Spirited Away who want Chihiro and Haku animated across the top of the browser (28,734 daily users as of Oct 2026).

Visionary Balanced

Best for: Anyone drawn to Mozilla's colourways who likes the version written for people who question the status quo (195,337 daily users as of Oct 2026).

Mozilla's colourways or an independent artist's theme

Three of the ten are colourway themes offered by Firefox, Mozilla's own set of colour schemes with names that describe a personality rather than a colour. The other seven are by independent creators, and four of those move: three say Animated in their names and one describes animated stars on a dark background.

That split matters more than it looks. A colourway is a quiet change of colour. An artist's theme is a piece of artwork across the top of your screen, and an animated one never sits still, so think about how you'll feel about it after a week of looking at it all day.

Daily users and ratings can tell different stories

Ash, offered by Firefox, shows 281,449 daily users but a 1.6 average from just 37 ratings. Dark space, an animated theme from an independent artist, shows 98,442 daily users and a 4.9 average from 2,078 ratings. All as of Oct 2026.

So a big daily-user count doesn't tell you people love a theme, and a small rating count can swing on a handful of opinions. Read both numbers together, then trust the preview.

The dates are worth a look too. Purple Night Theme was last updated on August 5, 2020, and Praise the sun (animated) on June 7, 2021, and both still sit in this top ten. A theme is mostly colours and images, so it doesn't need frequent updates the way an extension might, but check how it looks in your own Firefox before you keep it.

Which kind of Firefox theme for which mood

• You want something calm and plain: pick a colourway offered by Firefox, or a single dark colour from an independent creator.
• You want something to smile at: pick an animated theme, and switch it off if the movement starts to distract you.
• You love a film or a game: pick a fan-made theme whose listing credits the artwork it uses.
• You work late: pick a dark theme with a night palette, and pair it with dark mode in the sites you use most.

Adding, switching and removing a Firefox theme

1. Open the theme's page on Mozilla's add-ons site in Firefox and add it. It applies straight away.
2. Open Add-ons and themes from the Firefox menu to see every theme you've added. Only one is active at a time.
3. Switch between them there, or go back to the default system theme whenever you like.
4. Remove the ones you don't use, so the list stays short and easy to manage.

A theme only changes the look. If what you want is more privacy rather than a new colour, my guide on whether Tor Browser is safe to use is the better read.

Do you make Firefox themes? Tool makers can ask to be considered for a featured place on this list.

My plain advice on choosing a Firefox theme

Start with how much you want to notice it. If you'd rather forget it's there, stay with a colourway or a single dark colour. If you want a bit of joy every time you open the browser, try an animated theme for a few days. Either way, look at the rating count as well as the average, and remember it's a two-click change, so there's no harm in trying a few.

I'd also check the last updated date. An old date isn't a reason to skip a theme, but if it looks off in your Firefox, there's a newer one on this list that won't.

Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.

Frequently asked questions

What are Firefox themes?

They're add-ons that change the colours, and sometimes the background artwork, of Firefox's toolbar, tabs and menus. They don't change what the browser does.

Where do Firefox themes come from?

From Mozilla's add-ons site. Some are Mozilla's own colourway themes offered by Firefox, and the rest are made by independent artists.

What does daily users mean on a Firefox theme?

It's the count Mozilla's add-ons site shows for each theme. It isn't a download total, so it's a different measure from the download numbers you see on other stores.

Can I use more than one Firefox theme at once?

No. You can add as many as you like, but only one is active at a time. Switch between them in Add-ons and themes.

Are animated Firefox themes a good idea?

They're great fun if you like movement on screen. If you find it distracting, switch to a static theme in two clicks.