They don't do it for every extension, but they do so for a wide selection of popular options.
> Recommended extensions differ from other extensions that are regularly reviewed by Firefox staff in that they are curated extensions that meet the highest standards of security, functionality and user experience. After receiving Recommended status, safety standards are maintained through automated checks, monitoring, and periodic technical reviews
https://support.mozilla.org/en-US/kb/recommended-extensions-...
https://addons.mozilla.org/en-US/firefox/search/?promoted=re...
Some quite informative discussion on Firefox subreddit when I discovered and posted the above list there a few months ago.
https://www.reddit.com/r/firefox/comments/1pyvx2v/complete_a...
The Recommended Extensions program description: https://support.mozilla.org/en-US/kb/recommended-extensions-...
I've always wished extensions had more granular permissions though (a la phones, but more so). I think automated ai security checks sound promising soon.
They could save themselves the trouble if Firefox simply baked in its own ad-blocking, but since Google basically owns them, we all know that will never happen.
Ladybird browser is going to be awesome.
And Mozilla did develop anti-fingerprinting tech, but they can't enable it by default because it breaks lots of websites and when a website doesn't work they're not going to appreciate Mozilla for protecting them, they're going to be pissed that it doesn't work.
Fortunately if projects like Ladybird gain enough momentum, websites might be forced to cater to it. Time will tell.
Why, are they worried it might interfere with the spyware they bake into Firefox themselves?
https://www.howtogeek.com/557929/how-to-see-and-disable-the-...
Now we're back to needing an actual extension system that does what extensions were supposed to do in the first place.
Hate to be the one to defend Google here, but the reasons weren't that unreasonable. I want my browser to prevent random extensions from directly reading web page data. The declarative API idea is pretty good.
It's just that uBlock Origin is so insanely useful, important and trusted, it should get full access to the entire browser regardless. Honestly, it should be literally built into the browser instead of being a mere extension. Only the conflicts of interest inherent in an ad company maintaining an ad blocker prevent that.
Furthermore, malicious extension can read the data from the DOM, from forms (for example, password or credit card fields), and in some cases, from JS variables. They can insert fake information into the page. So preventing extensions from reading network data still leaves a lot of options for a malicious extension.
To be honest, to me it sounds like you don't want browser extensions then.
To me, directly messing with web page data and browser behaviour is the whole point of a browser extension - what else is a browser extension for?
I love Firefox.
We need more browsers like Firefox - more open source, more open to standards that improve the web, that can improve our browsing experience.
Obviously UBO isn't a first party feature - but if only Firefox could generate as much traction about ad blocking as they did with tabs.
Thanks for every day that this browser works.
Sometimes I had to test something in Chrome - and it’s painful experience.
But it really depends on personal view - I have tried to convert my friends and they don’t feel it.
Brave: chrome://flags/#brave-extensions-manifest-v2 > brave://settings/extensions/v2 > Enable uBlock Origin (Brave-hosted, even better).
Helium comes with uBlock Origin pre-installed.
Edge even still has it https://microsoftedge.microsoft.com/addons/detail/ublock-ori...
And I'm sure others ...I personally only use/test Brave, Brave Origin, Helium and Firefox.
I've installed uBlock Origin Lite in my Edge browser and I don't see any ads there either.
I actually used to install Revanced for all the relatives who ever complained about Youtube and some who didn't even ask! I just feel like Ad blocker is such a useful thing that I can do to people that I care about who don't know deeply about it.
I must say that it is one of the top entries of lists of most useful/time-saving things I have done in actually saving anybody's actual time.
I express gratitude towards the universe for Ublock Origin. Words can't comprehend how much I love it.
Microsoft Edge is about to lock out older ad blockers, just like Chrome did
Edit: and latest August 14, 2026 Chromium 152.0.7977.38 based Snapshot https://vivaldi.com/blog/desktop/address-field-calculator-an... has this in patch notes:
"[Extensions] Re-enable and extend Manifest V2 extension support for the time being (VB-130324)"
Related discussion:
uBlock Origin Lite now available for Safari (apps.apple.com)
1156 points by Jiahang on Aug 5, 2025 | 451 comments
More than Safari.
It isn't more used because one browser is promoted by the biggest search engine and thus has two thirds of the market, and the other two come pre-installed with the OS.
Let's hope for new generations to get tired of so many ads to finally ditch chrome.
I install uBlock Origin on every browser I come across. Everybody notices. The internet just feels better, somehow. People can't quite explain what changed, but they know.
In case people don't know, Firefox was the first major browser to even have extensions.
I'm not an advertising apologist, just pointing out that I can remember what ads were on a freemium TV station I watched two nights ago and what ads were on a radio station I listened to this afternoon but I can't remember a single web ad since...I don't know when. This might be because the TV ads have audio and visual, and with radio my alternative at the moment was looking out the window of my car, but web ads just seem very easy to mentally filter.
Firefox will never convince people to leave chrome on philosophy alone. I detest Chrome with a passion and refuse to touch it with a ten-foot pole, but cannot in good faith recommend Firefox to anyone in today’s world. “It kinda works” is about as far a compliment you can give it.
Not sure if it's the FF + Linux combination. Should probably try with a fresh profile to confirm.
It sucks, but I'm in on FF all the way. If much of the web stops working for me, it just means I have more time on my hands!
It appears that there are now significant numbers of sites - or at least noticeable parts or features of sites - that rely on Google-specific APIs and haven't been tested on other browsers.
However visiting those sites from Apple devices is often similarly frustrating. I'm not sure this is an anti-Firefox thing. It seems more of a not realising there are other browsers apart from Chromium-based ones thing.
I have used Firefox exclusively every day on macOS for the past year, several hours a day, and have not one single time had to open another browser. None of the customers of my B2B saas use Firefox. Not once have I needed to test in their browsers except quick smoke testing to prove to myself that the rendering and details are identical. All my other browsing is indistinguishable from before when I used Chrome, and from on mobile where I (tragically) am forced by Apple's monopoly to use Safari.
Do you have evidence to support your false claim?
I only ever use Firefox, at work, at home, mobile. Since forever, as long as there has been a Firefox (and Mozilla before that, Netscape prior).
There was one time about 8-10 years ago that I encountered a site that didn't work in Firefox, was some weird proprietary training module at work.
So yes, I did encounter one site that didn't work in Firefox in the last ~20 years. One.
I switched over to LibreWolf and other browsers like that then and never looked back.
This isn't such an outrageous assumption to make here.
https://github.com/mozilla/bedrock/commit/d459addab846d8144b...
Chromium is detestable. In whatever form it takes.
https://www.reddit.com/r/GrapheneOS/comments/1unhtxu/initial...
Yes, that's why google moved to manifest v3 and extensions can't do as much.
surely there is a way around that