Diễn đàn hỗ trợ Firefox

Hi!

I am having a problem with Firefox where: - if I am searching in the address bar in one tab (tab A), - but then before that finishes loading, I switch to a different tab (tab B), - Firefox will switch me back to tab A once tab A finishes loading. It's not immediate and is a little aggravating as it pushes me out of what I was already doing.

I'm currently on Firefox Beta (145.0) on Windows 11. I've tried the "When you open a link, image or media in a new tab, switch to it immediately" setting.

I really enjoy the new sidebar revamp, but I've had an issue with it recently that I haven't been able to find a solution for. Typically, the settings gear is supposed to be situated near the bottom of bar. However, as demonstrated in the attached image, it is at the top near the bookmarks and history buttons. I have tried reinstalling the browser from scratch, turning the sidebar on and off, turning vertical tabs on and off, and even getting rid of my custom CSS theme for a time. None of these have worked. If anyone knows what the root of this issue is, I'd really appreciate the help.

Guten Tag,

Im Firefox Developer habe ich seit ca. einer Woche das Problem, das die Lesezeichen nicht mhr funktionieren. Kann weder etwas anzeigen lassen, hinzufügen noch importieren.

Das zweite Problem habe ich heute 07.11.2025 festgestellt, habe einen neuen Tap geöffnet und es werde auf einmal die gespeicherten Webseiten nicht mehr angezeigt.

Was kann ich tun? Developer habe ich gelöscht und wider installiert, auch resettet, doch es geht nicht. Auf der zweiten Firefox Brwoser habe ich zwar die Lesezeichen, doch kann keine Webseite mehr hinzufügen. Auch bei öffnen eines neuen Taps, sind die gespeicherten Webseiten verschwunden.

It's apparently well known that Firefox and Gmail don't play nice together, apparently because of how Gmail uses Java. Is there a plan in the works to fix Firefox so Gmail isn't so absurdly slow? I don't *want* to switch to Chrome, but I don't want to stop using Gmail either.

Hi. I'm on Tahoe since 24 hours. I have Lulu installed. Lulu blocked an outgoing connection called ping sender that wants to connect to 34.120.208.123 and is related to Mozilla as Lulu says. But when I run a whois on this ip I get

NetRange: 34.64.0.0 - 34.127.255.255 CIDR: 34.64.0.0/10 NetName: GOOGL-2 NetHandle: NET-34-64-0-0-1 Parent: NET34 (NET-34-0-0-0-0) NetType: Direct Allocation OriginAS: Organization: Google LLC (GOOGL-2) RegDate: 2018-09-28 Updated: 2018-09-28 Ref: https://rdap.arin.net/registry/ip/34.64.0.0

OrgName: Google LLC OrgId: GOOGL-2 Address: 1600 Amphitheatre Parkway City: Mountain View StateProv: CA PostalCode: 94043 Country: US RegDate: 2006-09-29 Updated: 2019-11-01 Comment: *** The IP addresses under this Org-ID are in use by Google Cloud customers *** Comment: Comment: Direct all copyright and legal complaints to Comment: https://support.google.com/legal/go/report

In Lulu I have ▪ /Applications/Firefox Developer Edition.app/Contents/MacOS/pingsender

WTF?????????

I wanted to open firefox and a new window for new firefox open but did not suggest me to sync my old bookmarks. instead it only asked me if i wanted to sync with chrome browser only. why was i not allowed to save old bookmarks before new firefox updated.

I have a firefox account that I use for work, which was created with my personal email address - "email"@"personalDomain".co.uk. When I try to log in using it I get a message saying that "personalDomain.co.uk" is not a valid email address. How can I log into my account which was created using this email address? The email address is valid and active, and I do have access to it.

Hello! I'm having an issue specifically in Firefox Developer Edition only. Whenever I set a video to go fullscreen from any domain/service, little strips on the top of left of the fullscreen video show my desktop (shown in attached screenshot). I've tested this in regular Firefox as well as Google Chrome and fullscreen videos work just fine on both of those browsers.

Before this current version update, this problem would happen the first time putting a video in fullscreen, but every subsequent attempt during the same browser session would not have the issue. However, I'm now unable to achieve a true fullscreen video in Firefox Developer Edition no matter how many times I try.

Currently on version 145.0b3 (64-bit)

Im using a lot of web notifications. Where can I find a list for advanced preferences options I can use on web alerts under config://about?

Like ui.alertnotificationOrigin etc

I GOT TIRED OF FREQUENT FIREFOX CRASHES (C0000005) IN BOTH THE 64-BIT AND 32-BIT DESKTOP VERSIONS. I HAVE BEEN USING THE 64-BIT VERSION IN WINDOWS 11 (I HAVE A HIGH-END SAGER LAPTOP WITH 32GB RAM. I INSTALLED THE FREQUENT FIREFOX UPDATES BUT THE PROBLEN PERSISTED EVER SINCE VERSIONS 42X WERE RELEASED. I TRIED THE 32-BIT VERSION BUT THE PROBLEM PERSISTED. FINALLED, I TRIED THE DEVELOPER VERSION: NO MORE CRASHES! I READ THE RESPONSES FROM YOUR CLUELESS STAFF TO OTHER CUSTOMERS WITH THE SAME TROUBLE. THIS IS NOT A WINDOWS ERROR; THIS IS A FIREFOX APPLICATION ERROR. MAYBE SOME OF YOUR FIREFOX DEVELOPER CODERS SHOULD ASSIST THE 32-BIT AND 64-BIT DEVELOPERS. OR, DUMP THE VERSION 4X CODE AND BUILD ON THE MORE STABLE 39X CODE. ALSO, DON'T BLAME WINDOWS FOR FIREFOX APPLICATION ERRORS. AND...NEVER SUGGEST A WINDOWS REINSTALL FOR FIREFOX ERRORS!!!

I tried to use a ftp link setting firefox as the default ftp app, not realizing firefox no longer supports ftp. I am unable to reset the default app and can't find the setting to do so. I downloaded filezilla and wish to set it to be the default app for ftp. Can someone help me with this? Before anyone suggests it, resetting firefox to default settings is not an option.

Whether a person clicks the fullscreen indicator or types F on the keyboard, the cursor will remain on screen as the video is playing until it is again moved. This also affects video played through the browser on steampowered.com. This issue appeared as of 143 and is still going strong in 144. This seems to be macOS specific as I am not noticing this behaviour on the Windows client. Could be a conflict with Tahoe.. I don't really know at this point.

There used to be a website where you could fire off a 'Firefox made me happy/sad' which is where I would've preferred to send this. So, have other people encountered this issue? And if so, are there any lasting solutions beyond wiggling the mouse?

Hello why my firefox installation 1440b6 64 bit on windows 10 do not autocomplete the third field in a form login ..

namely , username and identification password are correctly filled , but the third field (that in my case are named "company ID") would not, it remain empty, and i need to manually fill in each time. Actually this happen only on a one site , but may be because only this site that i use have a three field to fill in the login page...all the others need only password and username

thankyou kind regards klx140

Good morning, I'm running Firefox Developer Edition 143.0b6 on Linux Mint 22.1. A couple of weeks ago I noticed that when moving tabs on the left-hand side they'll instantly get locked into an inscrutable and seemingly impossible to fix "pinned mode". Is there a way to turn this off? It is driving me crazy. I've looked through Settings > General > Tabs and about:config and didn't see anything relevant. If anyone has run into this or knows a workaround, I’d be grateful to hear it.

Hello why my firefox installation 1440b6 64 bit on windows 10 do not autocomplete the third field in a form login ..

namely , password and username are correctly filled , but one third field (that in my case are named "company ID") would not, remain empty, i need to enter each time thankyou kind regards klx140