29-09-2026 06:30 AM - edited 29-09-2026 09:03 AM
Firefox has evolved significantly over the past year and now, its look has evolved too.
The design begins rolling out today, with Firefox 157, bringing a cleaner, more cohesive , and more adaptable experience. It is still the Firefox you know and trust, with the same commitment to independence, privacy, customization, and user control.
The Mozilla Connect community has helped shape this work from the beginning by sharing feedback on the early designs, tested the experience in Nightly starting in July, filed bugs, and shared with us what worked and what didn’t.
Here’s what landed today.
A cleaner, more cohesive design
The updated design brought bolder color choices to Firefox — and your feedback made clear that opinions on browser color run the full spectrum. In response, we created additional themes, accessible through add-ons and a new theme picker off Firefox Home, so you have greater control over how Firefox looks.
More ways to make Firefox yours
Firefox is becoming more customizable, giving you more ways to shape the browser around how you browse. These options include:
Compact mode now officially supported!
Compact Mode is now available as its own dedicated setting. It will also switch on automatically on smaller screens, reducing the space between interface elements so more fits on the screen.
This is one of the clearest examples of how community feedback shaped Nova. Many of you told us that maintaining a denser interface was important, and we listened.
Faster performance
The refreshed experience also includes improvements to Firefox’s startup, page-loading, and scrolling speeds.
Frequently asked questions
Will my existing themes and add-ons continue to work?
Themes and add-ons should continue to work. Nova is built on the same Firefox foundation, and the extension and theming architecture has not changed.
Will my userChrome.css customizations continue to work?
Some customizations may require minor adjustments, depending on how closely they rely on element names or layout structures from the previous interface.
But keep in mind that Mozilla does not officially support customizations made through userChrome.css. They can cause unexpected behavior or even break Firefox, and future updates may affect them as Firefox continues to evolve. If you choose to use userChrome.css, please proceed carefully.
You can learn more in Firefox advanced customization and configuration options.
Can I opt out of the update?
The new Firefox design becomes the default experience starting with Firefox 157. However, you have several ways to adjust how Firefox looks and feels, including Compact Mode, themes, wallpapers, and New Tab customization.
Keep shaping Firefox with us
Nova may be shipping today, but the work doesn’t stop here. Many of these updates grew directly from the bugs you filed and the conversations you started while the design was being developed.
Update to Firefox 157 to try the refreshed experience, then let us know what works well and what could still be improved. Your feedback will continue to help shape what comes next.
02-10-2026 07:45 AM
You destroyed Firefox with this update. I have to restart it 2 -3 times a day because sites don't load. After restart it's ok. Revert all the changes you've done. They're totaly pointless.
Even now, I had to restart Firefox to add this comment!!!
02-10-2026 08:19 AM
If sites aren't loading, it's probably an extension causing the issue -- a lot of people in the past two days have had loads of issues with YouTube, and the Ghostery extension was the cause.
See if there are any updates for your extensions:
Menu -> Extensions and Themes -> click the ⚙ icon -> Check for updates...
If any get updated, fully-close all Firefox windows, and bring a new one up.
If you still have issues, a custom DNS server you use might be having issues.
Menu -> Settings -> type DNS into the search box -> under "DNS over HTTPS", click "Custom settings" -> check the settings there (e.g. click "Custom" and pick a different provider)
02-10-2026 08:48 AM
I've been using Firefox for 20 years and have never experienced something like this. I don't use this extension and all mine extensions are up to date. I use cloudflare DNS.
This loading problem is very strange because when it appears page loads but for example any button doesn't work. it's on every page after 1st appear. Only restart helps but only for some time when it appears again.
02-10-2026 09:07 AM
I'm not having such issues here on the 157.0 version, and cannot see any widespread reports of this so not sure what else might be your cause.
Maybe try backing up your current Firefox data:
Menu -> Settings -> Accounts and Synchronisation -> Backup
Then create a new profile
Menu -> Settings -> Profiles -> Settings -> Manage Profiles -> Create a profile
Then when you're in that new profile, test the same websites
If the issue is resolved, import your data back in:
Menu -> Settings -> Accounts and Synchronisation -> Restore your data
If not, you can always change back to your original profile, with all your data still there
02-10-2026 08:02 AM
The new border highlight on the active tab is incredibly distracting and calling too much attention to itself.
02-10-2026 08:15 AM
If you haven't done so already, use these steps to reverse most of the recent change:
URL bar -> about:config -> ENTER -> accept warning -> search nova ->
double-click line "browser.nova.enabled" to change to "false"
You can also install the previous theme here:
https://addons.mozilla.org/firefox/addon/firefox-proton/
⚠ The ability to reverse Nova may end in Firefox v161, expected Nov 24, 2026
https://bugzilla.mozilla.org/show_bug.cgi?id=2071454
03-10-2026 03:01 AM
@dftf wrote:⚠ The ability to reverse Nova may end in Firefox v161, expected Nov 24, 2026
https://bugzilla.mozilla.org/show_bug.cgi?id=2071454
Oh, so it's time to consider switching browsers. Maybe that's the goal... to kill the Firefox project because it costs Mozilla too much.
04-10-2026 08:02 AM - edited 04-10-2026 08:02 AM
Google pays Mozilla something like $500million a year to keep Firefox afloat, as then in browser anti-trust hearings they can go "nuh-uh your honour, Firefox exists".
If Firefox suddenly ceased to exist, where else will Mozilla get any money for? With most e-mail now being web-based, and Microsoft looking to abandon the classic "Outlook" by the end of this decade in-favour-of the free "Outlook (new)" in Windows, I cannot see any company ever donating purely due to Thunderbird.
And beyond those two products, what else does Mozilla have? 🤔
02-10-2026 09:12 AM
I think the browser feels a little snappier so far.
From a vertical tabs user: I actually prefer the pill shape tabs. However, the spacing is too big and makes it more difficult to select tabs now. I can put my mouse cursor between two tabs and there is still space between the text I am trying to choose. The option to remove the vertical tab scrollbar should be available though. I also think the gradient fading on the right side of the tabs should either be shrunk more horizontally or removed.
02-10-2026 09:57 AM
are the random crashes solved instead having now rounded cornors?
Seriously I cannot even put into the Adressline any website url anymore.
Why are you doing that?
02-10-2026 10:20 AM
Sucks so bad
02-10-2026 11:31 AM
I don't really care about designs but can I have my dark mode back though? like the previous black dark, not this stupid gradient of blue-orange.
02-10-2026 11:44 AM
Please please stop messing with my UI.
I'm not change resistant, but I've had a similar look for decades, every few years we go through a cycle where Mozilla tries to force a change, then backpedals it.
Please stop doing that. It's so tiring. New tabs merge and blend together, are hard to read, the click areas look unfamiliar.
I just want to use my browser without thinking about my browser.
02-10-2026 12:08 PM - edited 02-10-2026 12:16 PM
New design is terrible. No one asked for colors and certainly not a purple/pink gradient. At least let us pick our colors, including just plain old white again. All of the color option themes are too much color.
02-10-2026 12:42 PM
i decided to make an account just to give me thoughts on this update.
i hate it, bring back rectangle tabs, these ovals suck
02-10-2026 02:29 PM
You can type this into your address bar like you're going to a website:
"about:config"
Search up "browser.nova.enabled" in the menu that appears and click the little double arrow to the right to disable the new look (and maybe other things they added recently. im not a computer person but this turned off the new themes for me)
If you toggle that to "false" it will get rid of the stupid new oval tabs.
02-10-2026 01:19 PM
I don't understand how Mozilla can be so utterly out of touch with its user base. Do you guys do zero user research before launching something like this? Is this just because Google pays for everything and you have zero accountability to any real user? How can your organization be this dysfunctional and jump through such hoops to ruin your main product like this? Your entire management chain needs to be let go.
02-10-2026 01:28 PM
> bringing a cleaner
Nope.
> more cohesive
Lol? If "cohesive" means "in line with Mozilla's strategy to drive away its last remaining users"
> and more adaptable experience
Right, that's why it's the default experience with no simple opt-out. Adaptable means "we'll shove this update down your throats and you'll like it"?
> It is still the Firefox you know and trust, with the same commitment to independence, privacy, customization, and user control.
Are you even reading what you write...? What better way to retain trust than to force a UI update nobody asked for, that can't be customized and removes user control, and then lie about it to our faces?
Seriously, what is wrong with your organization and its priorities?
02-10-2026 01:34 PM
Forgive me if this is not the right place to leave this feedback, but I've found the updated icons and colors for containers to be less useful than the previous designs.
In my opinion, the design of the containers interface should be geared toward quick identification of the correct container that one wants to use. The previous design, shown in this screenshot from the containers Support page, accomplished this well by using mostly filled icons and bold colors very easy to differentiate from one another.
The new interface has changed in two main ways: the icons are now all outlines with shaded backgrounds, with no filled icons (they are also simplified, but I have no quarrel with that choice), and the colors are now much more similar to each other. This can be seen in the following screenshots from my own browser (personal info redacted), below. Notably, the new tab interface seems to use dark mode on my device regardless of Firefox's settings.
Interestingly, the "Always Open Site in Container" interface from the Multi-Account Containers extension seems to use a light theme regardless of system settings (I cannot recall if this was the case previously or not) and while it uses the new icons, it uses a different set of more bold.
I have a couple thoughts on the new design:
Overall, these are my recommendations for improving readability and ease-of-use:
In my opinion, the updated design of the container icons and colors seems to put form ahead of function to the detriment of the user.
02-10-2026 01:37 PM
Thanks, I hate it. I hate it all.
I've had to do some searching online and so far every article is saying the same thing: Telling me to go into about:config and basically disable anything with "nova" in it, since that is apparently the design name for this piece of turd. Unfortunately, doing so does not fix every problem with "Nova" (not even close).
"Firefox is becoming more customizable," — Lies
02-10-2026 02:00 PM
Please don't force UI updates, the nova looks so bad and feels like you're just trying to fit in with what you think looks futuristic but nobody asked for this. Please make it optional in the future.
02-10-2026 02:37 PM
As designs shift, I've gotten more and more annoyed by anything with round corners. It feels as if I'm treated as an infant who needs a user interface baby-proofed. This becomes doubly so insulting when the Firefox update page prominently directs me to a button in which I can custom tailor my UI experience and there's no available toggle or slider to assign the degree of sharpness of corner.
I should never feel required to dive into the about:config section just to return to a begrudging degree of UI acceptability. Even the previous design has corners, not sharp edges, in my browser tabs and mouse hovers. I simply want my UI to look as flat and sharp as a rectangle in Geometry class. Please let me have that.
02-10-2026 02:37 PM
At this point, there has been nothing done to address the negative criticism in any way that is meaningful to me, and it looks like Mozilla is committed to this UI and will be disabling the only thing that would make me consider staying in Firefox.
https://bugzilla.mozilla.org/show_bug.cgi?id=2071454
I will share my final thoughts, even though I don't particularly feel like my feedback or much of the other feedback I've read is being valued outside of requests for very specific adjustments within Nova. I enjoyed Firefox because of the ability to customize. I do not actually enjoy customizing. Once I customize something to my liking, I do not like having to reconfigure it again. So I am switching something allowing customization that offers an option of a mature UI that is less prone to updates. I get that it can be necessary sometimes, but I don't see that necessity here. Additionally, it shipped with numerous bugs in place, and is going to continue to roll out updates to the UI for the immediate future, meaning any customization I do now may or may not require rework.
I quite literally feel tired when thinking about the myriad of tiny adjustments over time that I would need to do to retain what I consider a functional and aesthetically pleasing UI/UX. I am sure that whatever plan you settle down with will probably have some long term stability after a little while, but I don't know how long that little while is going to be. I am actually a little sad. I originally got Firefox somewhere in the ballpark of 17 or 18 years ago. Even in that time, there had been disruptive updates, but I had felt some confidence that it was necessary under the hood to justify the disruption, so I stuck with it. I don't have that same confidence now.
I get the impression that Mozilla is hoping that UI/UX changes might help draw in more users. I genuinely wish you well in that regard and hope you cut into Chrome's market share with the flaming sword of Michael. The bottom line is that Firefox is no longer my browser.
I hope this feedback provides useful information and perspective about why at least this long-time user has decided to leave.
02-10-2026 03:43 PM
I very much dislike this new UI design, it makes things look like a crap version of browsers I have opted out of using. I dislike the ovalization, I dislike that tabs feel hidden IN THE TAB BAR because they BLEND IN WHEN THEY ARE NOT THE FOCUSED TAB, and I very much dislike that there is no option to revert to a more classic look. Even IF someone made a theme to mimic some of it the more preferable will always be just being able to default out of this crap.
02-10-2026 04:16 PM
as for a person that uses firefox from first release this update is an insult. total f up and disregards of any option for users to use old design, and new design is, oooohhh boy, if you think it WOWSY new guys will show up, nah yo f'd up. seems like I will search for a firefox fork from someone who doesn't do this. Just imagine, this change was so bad that I had to use shady login system to find some kind of form to reply. that's speaks alot.
02-10-2026 05:53 PM - edited 03-10-2026 01:42 PM
Here is my feedback on this abysmal Nova update:
02-10-2026 06:53 PM
God why would you go for "softer tab shapes". Let us decide what our tabs look like, I hate this.
02-10-2026 09:26 PM - edited 02-10-2026 09:45 PM
Congrats to this update for being the update that made me turn off auto updates
Edit: Oh my god I might just jump ship. You people actually made your forums auto subscribe to any post you comment on. You actually think people want a notification for every single post someone else makes that is not even in reply to them. You are incompetent.
03-10-2026 07:15 AM
yeap....nightmare. Had to come turn off all the subscriptions. One way to get users to participate is to force them to.
04-10-2026 06:18 AM
You people actually made your forums auto subscribe to any post you comment on. You actually think people want a notification for every single post someone else makes that is not even in reply to them.
Yes, the decision to default to "notify me on the site about absolutely every update" and "e-mail me about every single update" is really baffling.
E-mails should default to "when someone replies to me" or "when an answer is chosen to a question I post, or have subscribed to". And for notifications on here, I'd say it's fine to default to "when someone replies to a post I've also replied on", but a notification for every Kudos (aka Like) is crazy!
You can manage them here:
https://connect.mozilla.org/t5/user/myprofilepage/tab/user-subscriptions:notification-settings
Tick all of these...
Turn off all push notifications
Turn off all email notifications
Turn off all real-time pop-up notifications
Turn off all mobile notifications
...then scroll to the bottom and tap Save and enjoy the silence!
02-10-2026 09:32 PM
please for the love of god just roll this kind of thing out with a toggle. i don't quite care what direction you guys want the UI to go in, just make sure people can roll back to a previous version if they want.
02-10-2026 10:22 PM
I've never posted here before, but the rounded sides made me want to say something. The less rounded buttons and tabs looked better, these new tab sides are making me stare in a bad way. The other issue I've noticed, is that the new tab page, settings and maybe other page colors are purple, they don't change with the selected theme, so you get a visual mismatch. That makes me not want to use anything other than the default theme, for these reasons I find it difficult to enjoy the new look. On a side note, a plain light and dark theme would still be nice if you didn't want the gradient.
02-10-2026 10:54 PM
I'd like to add one thing, it seems to look decent to me on the light theme, I don't know why. My recommendation would be a new setting to selected how rounded you want the corners. You could go from full squared to partly rounded to full rounded like these. I'd say it's better to have choice here.
02-10-2026 11:47 PM
Fine, you want it to look modern; I respect that! So meet me in the middle here; give me a disable/enable feature. Respect goes both ways.
04-10-2026 08:53 AM
He visto varios comentarios que hablan sobre respeto... pero me pregunto si Mozilla Firefox respetó a su base de usuarios que no participaban en este foro antes de implementar la aberración de "Nova". Si la gente dice que respeta opiniones y no respetan la capacidad de personalización de su propio navegador, entonces ellos desde un principio no están respetando a nadie y hay que tenerlo en consideración.
---
I have seen several comments that talk about respect... but I wonder if Mozilla Firefox respected its user base that did not participate in this forum before implementing the aberration of "Nova". If people say they respect opinions and do not respect the customization capacity of their own browser, then they are not respecting anyone from the beginning and that has to be taken into consideration.
05-10-2026 01:35 AM
I agree. I've looked into this and there was a lot of push back on Nova during the development. To touch on your 'do they have respect for the user base' I think if you follow there history and philosophy of the project management they have followed a opt-out policy. This is not respecting the user base. I can list over a dozen Firefox "features" that have rubbed me wrong over the last 10 years but the 3 that have had long lasting feelings if Mozilla cares are, PPA Meta partnership, AI Integrations and Sponsored Search Suggestions. These three were enabled by default, again a Opt-Out policy. They have to focus on making money. I do not agree with what they are doing but I understand why they are doing it. I don't know how strict they are here with staying on topic but I feel you can't talk about Nova unless you talk about the past issues also.
03-10-2026 01:11 AM
I do not like this change. Right of the bat, I can suddenly fit way fewer tabs at the top of my screen ebcause there is an enormous 100px gap between each element because you chose the MOST rounded possible shape and still retain a giant margin between tabs that are out of focus. Your own container tab visual indicator doesn't fit and bugs out with the new tabs, your new menu no longer aligns with the edge of the screen and has giant margins because, again, you chose the most enormous round for all the corners for reasons that completely elude me. The buttons on this site have a perfectly adequate amount of round. Why are we wasting so much visual space?
If you wanted to have more space on touch screens, why did you not make rounded buttons an option? Why is Firefox wasting so much screen real estate on desktop also?
03-10-2026 01:12 AM
In fact, why even add a compact mode if there's still 75px of wasted space between each tab because, again, you chose to implement a full round edge for all elements.
Your left and right hands don't know what they're doing.
03-10-2026 01:35 AM
What is the point of these rounded corners and (maybe use the derogatory German term *Klickibunti*) these unnecessary, flashy color gimmicks?
It’s the first thing you see—and it doesn’t look good; it certainly isn’t an improvement.
Quite the opposite: the rounded icons everywhere waste screen space, even if only a little.
After all, I don’t go around rounding off the corners of my physical photographs.
Give us back our corners! 😐 Or at least give us the choice.
03-10-2026 02:22 AM - edited 03-10-2026 03:11 AM
ok so now even the right click menu for tabs is a fu cking migraine trigger for me. Even switching to light theme won't fix it. I can't use firefox anymore, it's no longer safe to use. Fu ck every single person at mozilla responsible for this s hit, your actions are reprehensible, your hostility towards disabled people is blatantly fu cking apparent and absolutely abhorrent.