Diễn đàn hỗ trợ Firefox

I am unable to sign into Costco.com using Firefox. I get an error message:

    "Bad Request - Header Field Too Long
    HTTP Error 400. A request header field is too long."

Turning off all extensions didn't help. Opening a private browsing window DID work. Using Chrome DID work.

Thanks!

So I understand why shift right click opens the context menu, and its been useful to me when I need it, but I'd like the option to disable it for trusted websites, or just a toggle I can turn on and off when needed. Even tucked into advanced options. For reference, its an issue when I play littlewargame, a browser based RTS game. Shift is how you que commands, so target firing specific units in order or setting multiple move commands requires me to hold shift, and right click multiple times. Obviously having the context menu pop up every time is an issue. Any chance that could be made into a toggle somewhere? Does anyone know of an extension that adds that option if it isn't built in?

Thanks in advance <3

All of a sudden this morning Firefox is displaying pages (my purchases on Amazon) in Times Roman font. On other sites, I hover over a link which should be active, but clicking does nothing. YouTube doesn't play, just hangs with the in progress circle spinning. Anybody know what can be causing these issues? I've rebooted my Windows 10 laptop several times, but I can't Firefox to work.

Thanks for your help.

The other week I had to edit a PDF file for my school, it was going well but when I sent it i got a call saying the blanks on the pdf file was empty even though when I opened the file on firefox they were there. I checked gmail and i saw that the edits i made, especially the text was gone, just a few remained for some reason. Today I edited another pdf file and when I opened it on chrome to see if the problem was still there, it was. More than half of the edits i made on the file were gone. I don't understand why only some parts stay but the rest disappears, is there a way to fix this?

Hi Firefox Support,

I was directed to contact you by Metamask Support. I'm experiencing a problem connecting to Metamask from Firefox, though it connects without any issues in Chrome. Based on this, Metamask Support believes the issue may be related to Firefox.

Here's what I've done to troubleshoot so far:

Cleared cache data in Firefox. Verified that I'm using the latest version of Metamask (34.0). Encountered an error when trying to switch networks with the message "unable to connect to Polygon." Confirmed that no other wallets are causing conflicts. I've attached some screenshots for your reference.

Given that I can connect to Metamask in Chrome and have already cleared data in Firefox and ensured I'm using the latest version of Metamask, Metamask Support suggested the problem might lie with Firefox.

Could you please help?

Thank you.

When I scan the QR code shown on my computer with my phone and press the sync buttons, I get a message on my phone to; "Open the authentication app and enter the security code it provides."

I have no idea what this app is or where to find it to open it. Is it on my phone or my computer? Why can't you just show the code on my computer sync screen?

And, your help pages just repeat the same instruction verbiage as the sync app on my phone. No additional help at all!

Running Windows 11 on a Dell XPS 8930. Internet download speed is 100Mb/sec. With every update of Firefox it seems to take longer and longer to launch Firefox and load open windows and tabs. Several minutes of the back and forth ball on each tab. I can launch Chrome and its windows and tabs load almost immediately. What can I do to improve Firefox performance, short of abandoning it?

I imported bookmarks from Chrome. I used it for a long time, so I've got 600-some-odd bookmarks in a lot of subfolders. Nested folders are the only way I find what I need.

I followed this advice https://support.mozilla.org/en-US/questions/1366211 - I bookmarked the page. - I "edit bookmark," highlighting the parent folder that's visible on the bookmarks bar. - I click the right-most down arrow. That displays only directories visible on the bookmarks tool bar. - The right-most arrow operates as a toggle between showing the desired parent directory only all of the parent directories visible on the bookmarks tool bar.

In case it matters, I uninstalled and reinstalled Firefox this week, so it's up to date.

I am using Firefox for windows on my laptop and I have this issue where it stopped filling in my credit card information. I tried to follow the steps of turning it on/off in settings, except no "Forms" or "autofill" appear anywhere in my settings, nor privacy & security. Going into config, it appears that form and autofill for credit cards are both switched on and available. My browser is updated and everything else seems in order. How do I fix this?

I am currently facing an issue where videos on websites other than YouTube are not playing. This problem is occurring on browsers like Firefox, Brave, and Opera, but interestingly, videos are working fine on Chrome. I have tried various solutions over the past 2 years, including removing extensions, using private mode, installing web media extensions and codec packs, but nothing has resolved the problem. I am using Windows 10. I would appreciate any insights into why Chrome is able to play videos while other browsers are not, and I'm specifically looking for solutions beyond the usual suggestions like removing extensions or using private mode.

Since a week or two my Firefox tabs are crashing more and more often. At work on MacBook and at home on PC.

Deleting the cache and cookies and even starting in Safe Mode are not helping - in fact while writing this very message had 5 crashes meanwhile!

Don't know if you can access the crash report: https://crash-stats.mozilla.org/report/index/4cd570db-d90d-4fcb-aee6-0a1660230818

I can no longer access the website www.att.com. I receive the following error message. I've deleted history cache and cookies but still can't access it.

Access Denied You don't have permission to access "http://www.att.com/" on this server.

Reference #18.14ad3c17.1692143272.3762eaa6

Any suggestions? It works fine via Microsoft Edge

Hi,

I was a former IT person for decades and used Firefox because I love it. But lately, it isn't usable for me. Seemingly happened out of nowhere within the past few weeks.

I tried all the troubleshooting steps in the guides on your support forum, but nothing worked. So I tried the following:

1. Uninstalled Firefox using Windows Uninstaller 2. Deleted every single Mozilla folder from within the user profile to the program files folders, local roaming folders, etc. - EVERYTHING. 3. Went into the Windows Registry and also deleted Mozilla folders within the local machine and current user folders. 4. Rebooted computer 5. Went to Getfirefox.com and reinstalled Firefox. 6. Logged into a brand spanking new Firefox installation

Still SLOW as molasses. Frustrating. I can't work. It is literally 4x slower than any other browser now. I use Firefox for 90% of my web stuff, the other browsers 10% of the time for testing. But as it goes now, I cannot use Firefox anymore after decades of using it.

Anything else I can try? Maybe I missed something when I scrubbed it and reinstalled? Why suddenly is it this slow? Any ideas?

I will try next to log into a different Windows profile I guess and see if that improves it. Maybe my Windows profile is jacked up, although, I thought removing all Mozilla folders from within my Windows profile would be enough, so I am not so sure that will fix it. I will try though.

Any help you can provide would be much appreciated.

Thanks,

Mark

my Other Bookmarks is no longer in my bookmarks toolbar. I have two laptops and the other one is perfect. I tried sycing many times, I did a restore (which I shouldn't have) but nothing makes them reappear. While I can access these bookmarks from the menu bar, I want to see it in my bookmarks toolbar. It did not fall off into my customized overflow either. Whaaaatttt is going on? I need to put it back asap without spending hours trying to make this simple thing happen. Also, why did it disappear? And why won't a sync bring it back?

Please enable the ability to use the "Dark Reader" add-on on this site or let us change it in the settings. Horrible experience in light mode. On the added image you can see that the "Dark Reader" add-on is enabled.

This is a many years old account/install with Netscape/Firefox, now 116.0.1, 64-bit Windows.

When offered a box for email step 1 login -- this site, for example -- FF auto fill offers my correct address first, but then there are two offered below that in the auto fill offers that are not mine.

How can I access where those are stored and remove those erroneous or mal email addresses?

Searching here infers the Profile; yes, my first guess, but my Profile is 725 MB ... so any hints available?

Hi, Recently purchased new laptop with Win 11. I was having trouble downloading anything. Always indicated failure.

I checked some of the responses here for that problem. One of them said to not accept HTTPS only. When I checked my settings, it WAS already set to Don't enable HTTPS-Only Mode. I then set the HTTPS-Only mode to Only in private windows. That setting now allows downloads. Why doesn't it allow downloads when I don't accept HTTPS only?