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I was going to look at a friend's website that has an SSL-certificate, has had it for years, which has been working all that time. Now Firefox informs me: "Firefox doesn’t trust this site because its certificate isn’t valid for www.wuwei-school.nl. The certificate is only valid for: wuwei-school.nl."

Really? I pretty sure there's nothing wrong with the certificate and I was taught that the "www" component is not important as a prefix for the domain name in a URL. It is just a shorthand code to show that the address is a URL. Can Mozilla fix this issue? Or, at least, explain?

Thanks

Firefox's full message: - - - Be careful. Something doesn’t look right.

Firefox spotted a potentially serious security issue with www.wuwei-school.nl. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails. Advanced What makes the site look dangerous?

The site is set up to allow only secure connections, but there’s a problem with the site’s certificate. It’s possible that a bad actor is trying to impersonate the site. Sites use certificates issued by a certificate authority to prove they’re really who they say they are. Firefox doesn’t trust this site because its certificate isn’t valid for www.wuwei-school.nl. The certificate is only valid for: wuwei-school.nl. What can you do about it?

Probably nothing, since it’s likely there’s a problem with the site itself. Sites use certificates issued by a certificate authority to prove they’re really who they say they are. But if you’re on a corporate network, your support team may have more info. If you’re using antivirus software, try searching for potential conflicts or known issues.

View the site’s certificate

Learn more about secure connection failures

Error Code: SSL_ERROR_BAD_CERT_DOMAIN

Aug 21, 2026 11:10:31 PM GMT+2 - - -

Just had occasion to use the word Backpfeifengesicht. Out of curiosity, I highlighted, right-clicked, and chose "Translate to English". Hilarious result: "Baking pipe face".

(The correct answer is "punch-me face".)

Translate is often quite good, but I think it would be nice to be able to report the occasional mistake. So, as I asked in the subject linke: is there a central place to do this?

Thanks.

I have a cmdfile to open specific news websites in a private window. The syntax of the cmdfile line is

start "" "C:\Program Files\Mozilla Firefox\firefox.exe" -private-window %*

with a "timeout /t 2 /nobreak" call for a 2 secs pause between each to give things time to get going (firefox seems to trip up if I rush it with URLs using start command .. probably understandable).

This works, but all "windows" open in a new tab in the existing or initial private window instance. I want them to each open in their own instance of a private window. It seems to be behaving like the option -new-tab rather than a genuine new private window for each URL.

What option/s do I need to use to get a true new private window with just the specified URL open in a single tab for each URL I have coded?

После обновления начали намертво подвисать странички (на данный момент заметил на youtube и в google, при попытке войти в аккаунт кнопка просто не прожимается), как выяснилось причина в том, что новое обновление не совместимо с расширением absplayer, когда его отключаю всё работает исправно. Что делать в такой ситуации, и будет ли патч в ближайшее время? Расширение мне крайне необходимо, а с их стороны никаких обновлений также нет

I'm encountering some UI errors with the last couple updates. With an update from a couple weeks ago, I noticed when viewing PDFs in the browser, random characters would be invisible, and in Google Sheets I'd notice some cells appeared blank, though selecting them showed that there was text inside. I also noticed disappearing text in a Google Doc I was working on. Now with the update that was just released today (154.0) all PDFs, and entire screens in Sheets and Docs, and other random graphic elements, are showing up as just flat black (see attached screenshot). My job involves working with spreadsheets and PDFs a lot so this is severely impacting my workflow, and I am reluctantly working in a different browser today.

I did a browser refresh, and then I uninstalled and re-installed, and that didn't help anything. What should I try next?

I should note I am using Firefox on Windows 11. I am not experiencing any issues with Firefox on iOS or Mac OS.

Edit: I was able to troubleshoot and fix this by disabling hardware acceleration under performance settings. Problem solved!

helloooo

i am experiencing an issue with firefox where backup (Firefox Backup) is not working since version 148.0

problem: - when I try to create a backup, i get the error: “Hmm, there was a problem with the backup. Please try again in a few minutes.”

what I have already tried: - enabled and disabled backup password - changed the backup folder/location - cleared browser cache - tested across multiple updates (issue persists)

- backup is enabled, but I cannot create one - the error occurs every time - restarting the browser and system did not help

Trying to read the news articles, find something interesting, only for it to be sub-walled or pay-walled.... Been reporting them for over a year, nothing seems to change. I'd imagine a simple script would be able to open these links one at a time and detect a pay/sub-wall immediately and 86 it from the line-up..... You'd think.... But I also think it's safe for us to assume the reason they don't bother fixing this consistent, widely-encountered issue, is because they acquire coinage for unique hits on those pages. It's disappointing AF, because we all know they could fix it with EASE. That is all.

Cannot reach extensions search from Firefox about:addons page. I keep getting the following when I search for any extension.

Error 503 Backend.max_conn reached Backend.max_conn reached Error 54113 Details: cache-bfi-krnt7300022-BFI 1787247272 698900040 Varnish cache server

Firefox lately seems to create problems every time it is updated. I am really leaning towards making MSEdge my default browser because I am tired of these problems cropping up at each major update. I spent several hours this morning making sure my bookmarks and my saved logins and passwords were up to date with what I have in Firefox plus making sure my privacy and security were at it's tightest and strongest there. Major updates for Firefox use to go smoothly and seamlessly but that is now questionable.

Respectfully

I have had a bit of a problem with a keyboard today and tried downloading drivers and reading faqs about it, and apparently as of today (august 20th 2026) firefox decided that most sites are unreachable (which they clearly are since the laptop running win11 works) Why the sudden overstep? BTW I can't access this page on the win10 computer.

linux, firefox, and duck duck go search engine---i want to stop picture in a picture. include every instruction like if i am to use the address bar, where do i find that?

I am on the VistaPrint website and have an Ai support window open that I can't close because the entire window is not visible. I need the top of the window available to close it out and unfortunately the window blocks me from doing anything. I have backed out, logged back in and the window is still present. I contacted Vistaprint and they said it was a firefox issue and to try Chrome. I used Chrome and they are correct, I can access everything, went back to firefox and tried but the window is still present, if the window size could be reduced, I could access the top to close it. Please help.

Hi,

Now when I do a Command N, a new browser window is opened, but I always get the same dozen or so tabs that open. This did not use to happen and I do not recall changing any settings.

I can close all those tabs, close the window, and when I open a new window again, that tabs are all back.

Thanks so much, Charlie

PS Yes. It's driving me crazy.  :-)

I noticed that my Tab background color doesn't change after recent Firefox updates.

I have this code (css - chrome) to change the color of the active tab to green and it no longer working.

/* Start code: Change color of active tab to Green and the inactive to default*/ tab[selected="true"] *{ background-color: #00c100 !important; /*Green */ font-size:10pt !important; font-weight: 650 !important; color: black !important; }

Any help in fixing this is appreciated. Regards,

so i installed the atarashii extension, but it didn't work for me, so i deleted it, then rebooted my pc to notice that it's running, and i can't unistall it, i disabled it but for some reason it still works

Hello, I wanted to ask about this new site permission.

I previously used the "set cookies" permission for specific sites to keep their data after closing Firefox (Dev Edition), but now we have this "keep site data when closing" permission, can I just rely on this new permission instead? I should probably test it, but I wanted to ask first :p

Was I using the "set cookies" permission incorrectly this whole time?!

Thanks, +-

I have used Firefox as primary browser on my Mac for many years — never Safari.

Until yesterday, I used Safari as the only browser on my iPhone.

I now see all my Safari bookmarks in the iPhone’s new Firefox browser, but not the important open Safari tabs.

How can I sync my iPhone Safari web page tabs to Firefox on both devices, and sync the Mac’s open Firefox web page tabs to iPhone Firefox?