Firefox Community Forum

On Windows 10 with 64-bit Firefox, after updating from version 144 to 145, some local HTTP-only servers stopped working and became inaccessible. When I enter http://<local server name>, after a few seconds it automatically changes to https://<local server name>, and since no HTTPS service is running, it ends with a “Server not found” page. It seems to be related to DNS — accessing http://<IP address> works fine.

I tried a clean installation with a new user profile, but it didn’t help. Downgrading to version 144 fixes the problem, but at the cost of losing the user profile (which is a disaster). I also tried to check the HTTP-only settings (which I’ve never modified), but that didn’t help either.

Is anyone else experiencing the same issue?

Consider the following scenario: I want to go to "nextcloud.com", so I go to the address bar and start typing. Unfortunately, I make a mistake, and the first character I type is 'b'. Firefox then offers the autocomplete "bc.co.uk", and highlights it. I type another different letter, the added autocomplete offer is replaced with the character I added, and it will try to offer another autocomplete suggestion with all the characters I have typed so far. However, I realised the 'b' was wrong, so I press <backspace> then start typing "nextcloud.com". Of course, the backspace key now only removed the autocomplete suggestion, leaving the original 'b' I typed (so I now have "bnextcloud.com"). My question: Is there a way set configure firefox so that the key sequence 'b' followed by '<backspace>' to return the address bar to the original (empty in this example) condition? If this means turning off auto-suggest, I am happy to do that, since I don't use it anyway.

Thanks.

Heya,

I am the maintainer of the British Dictionary.

For one year that I have been working in the "shadows" on my version of US+Canada+Australian, to be released on 1-JAN-2026.

Can I add your list of proper names (~5000 words) to my dictionaries and release the dictionaries as LGPL?

https://searchfox.org/firefox-main/source/extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/5-mozilla-added.txt

Thank you!

Mon. 11/10/25 -- Good evening. Periodically, the Wallpaper option that's available when you have a new tab opened is NOT THERE. I've used your backgrounds and sometimes my own. But out of the blue, a new tab will have no background picture and when I use the pencil to open the menu, there are no wallpapers showing.

I don't see a reason for this, particularly since I haven't changed anything and no one else has access. This is a Dell Desktop, XPS 8960, fully loaded, enough of everything and running on Win 11.

So - are there limits to the graphic size used for a background? Would this be caused by a FF update? So many questions, and thanks for answering them.

BTW - I can't select the EM box below, so just send to me at: [edited email from public community support forum]

Kaspersky just found this hidden in the Firefox cache folder and the funny part is that I don't even use Firefox that much. I didn't visit any sites on this particular Firefox except Facebook. So, what sort of malware is this? A Trojan stealer or a dropper of some sort? I am running a Full Scan for now and I have uninstalled all the browsers incl Firefox, Chrome. Detection name: Trojan.JS.Agent.exz

The details of Detection: Event: Object deleted User: DEMON-SLAYER-2\....... User type: Initiator Application name: avpui.exe Application path: C:\Program Files (x86)\Kaspersky Lab\Kaspersky 21.22 Component: File Anti-Virus Result description: Deleted Type: Trojan Name: Trojan.JS.Agent.exz Precision: Exactly Threat level: High Object type: File Object name: 2309DFD956392BDFD0C84CA455FF6426B6B0FA9F Object path: C:\Users\......\AppData\Local\Mozilla\Firefox\Profiles\i2607jtb.default-release-1739822052193\cache2\entries MD5 of an object: 6FEC3D1DC6D1802AEADC4F8611A9F326

Since this is a Trojan, can this be Dangerous? I scanned it in virustotal and 33 engines were saying malware.

Virustotal link: https://www(dot)virustotal(dot)com/gui/file/2cee43e2e59ade158bfe5b124c07e9e45b7a378e379a8be8bb3272b10cf344e2/detection

Hey everyone, I’m working on my website, lewisestimating.com, and I’ve hit a wall. Everything looks fine in Chrome and Edge, but in Firefox some parts of the layout don’t show up right. Images are out of place and a few buttons aren’t behaving like they should.

I’ve tried clearing cache, disabling extensions, and testing in private mode, but it’s still the same. Has anyone had this happen when working on their own site? Any tips on what I should check or tools in Firefox that can help me figure this out?

Would really appreciate any advice or suggestions.

I believe I had all this synced in Firefox Settings before I made the upgrade. Like all you fellow former users of Windows 10, I had to upgrade to Windows 11; and did so two days ago. Now, I found that I do not have under History any of the former sites I not only visited but also had tabs open. What can I do, if anything, to recover them? Under the Add-ons Manager, if this helps, I already had the app Tab Session Manager, but don't know how to use it. Thanks to all in advance who may have made this same upgrade. Many out there are still on Windows 10.

So this morning I sat down at my computer which was already on and working fine yesterday. Today my bookmarks had disappeared. I rebooted several times, closed and reopened firefox several times and I don't remember what else I clicked on but my bookmarks had reappeared. I sat down at the computer a while ago and opened firefox and my bookmarks seemed to have disappeared again. Before when I clicked on bookmarks up on the toolbar my bookmarks would appear. Now I have to click on bookmarks then bookmarks toolbar to see them and now all of my logins are gone. Should I just ditch this browser and use chrome or is there some simple fix? I never have had as many problems with a browser as I've had with firefox and I no longer see an advantage in using it.

Apologies if this is the wrong place to ask this because I'm at my wits end on this one. I work on an app that is used by a large amount of users. Starting october 14th around 7am (UTC+1) we started observing weird behavior where a small ammount of traffic (less that 1%) would have abnormal header values:

'custom-header-1':'[custom value], [custom value of a different header]'; 'custom-header-2':'[custome value of header 2], u=4'; 'sec-fetch-site':'cors'; 'priority':'same-origin'; 'sec-fetch-mode':'empty';

As you can see the values of these headers are mixed with one another in almost a deliberate manner (since it appended the u=4 with a comma separator and a space from the priority into the custom header 2 value). There is nothing in the client code that would do this kind of manipulation, and from examining the logs this only happens on Mozilla browser traffic starting version 144 (which was released on October 14th coincidentally). Not that this does not impact all Firefox traffic. In fact, just a tiny fraction of traffic from random users and it's not even all of their traffic of an active session. Just random requests that then fail, are retried and the abnormal headers are gone.

I doubt the fault lies in firefox. If I had to hazard a guess it's probably some extension acting up, but the timing coinciding with the release of 144 give me the only troubleshooting path I have right now since contacting the users is not possible. We've seen it happen 145 as well.

I'm not really looking for a solution here, just a shot in the dark if someone else has experienced this or has some insight as of what this could be.

This video file cannot be played.(Error Code: 102630)

I’m getting this error for some reason, and I can’t figure it out. I’ve tried downloading various support files for different codecs, yet I still can’t play videos on websites or live videos like YouTube livestreams.

I’ve tried reinstalling the browser, VLC, and updating the media drivers, but it still doesn’t help. The same videos run fine in other browsers like Edge, but for some reason, they won’t play in Firefox.

Hi everyone, I manage https://myphoneoffers.com, a website that lists mobile phone prices and SIM packages in Bangladesh. I’ve noticed that a few JavaScript-based components (such as floating offer banners and comparison tables) don’t always load properly in Firefox. In some cases, it looks like ad-blocking or strict tracking protection might be preventing the scripts from running. I’m using lightweight JavaScript with no third-party ads — just local scripts and analytics. Could anyone explain how Firefox’s Enhanced Tracking Protection or JavaScript settings might affect embedded scripts? And what’s the best practice to make sure essential scripts still load while maintaining user privacy? Any insights from web developers familiar with Firefox’s JS behavior would be really helpful. Thanks!

When I check my passwords I get a message saying that my password has been compromised and that the user name is admin. They suggest changing the password immediately but every time I try I can’t figure it out. I can change my password and have done so, but the admin password I’m not sure what to do.

when i try go log in on certain sites i keep getting a message asking for a fingerprint my computer doesn't have a finger print and i have no clue what it is asking for.

Hello Firefox Community,

I’m facing an issue with my restaurant-related website Bojangles Menu with Prices—https://bojanglesmenuprices.us. .

When I search for my website in Firefox or share one of its pages through the browser (for example, by copying the link or sharing via email/social media), the preview doesn’t display correctly. Sometimes the image thumbnail is missing, and other times the meta title or description doesn’t appear.

Here’s what I’ve already tried:

Checked the Open Graph (OG) and meta tags on my site.

Cleared Firefox cache and cookies.

Verified that the site preview works fine on Chrome and Edge.

Updated all social and sharing metadata in my HTML.

Is there any Firefox-specific issue or setting that could affect how link previews or shared content are displayed? I’d really appreciate any help on how to make my Bojangles Menu website show up correctly when searched or shared via Firefox.

Thank you! Sonia

On my home page there used to a dozen or so boxes with the web sites I most frequently use that I could click on. It would open a new tab and go to that site. They had the logo of the site. They aren't there anymore. Can I get them back? If so, how?

I'm sure someone will have answered this somewhere but is there a way to backup and restore the native Mozilla Tab Groups. I've seen plenty of people recommend other Group Tab extensions but I like the inbuilt one combined with Containers.

I've read that you can backup the whole Mozilla profile folder and this should work but I've tried that and failed, I used a few extensions to backup sessions and that also failed.

Any help would be appreciated.