Fórum podpory Firefox

I am not fluent in English, there may be errors in translation.

When changing from theater mode to full screen, a black screen is displayed and the screen does not appear.

I left a video link below. https://youtu.be/ZfAOKGmVyBY

I have certain extensions that temporarily block my access to certain sites, including to my add-ons so I can't use it to disable the add-on. However, when I open firefox, I can easily access the "add-ons and themes" selection from the toolbar before the blocker takes effect, allowing me to access the add-ons page and disable the add-on before it blocks the site. Is there so way to hide or make it take longer to access this open? (Such as removing it from the tool bar)?

Whenever I try to fullscreen a Youtube video, it just displays a black screen. It is not temporary, and the picture never loads in. I have tried the full-screen-api solution. Didn't work. I tried deleting my cache and cookies. Didn't work. I tried disabling hardware acceleration. Didn't work. I restarted my machine twice, and that didn't work And I am on the most recent version of Firefox.

Storage drive on my laptop got corrupted recently, So I got a new storage drive and installed windows on it. So I don't have any offline backup for my bookmarks. Is there any possibility that Firefox created any automatic cloud backup through which I can restore my bookmarks?

If not, how to setup automatic cloud backups for future.

Thank you

Hello, i am using ducducgo as search engine on my firefox. i have noticed that it does not support since yesterday. site from saved shortcuts only supports, other than anything i am trying to surf it shows error connection was not secure / reset. where same site are opening with google and bing search engine in firefox and same problem were facing in mobile browser also. Please fix the issue as soon as possible. Thanks.

Hello everyone,

this here is a really odd problem and not one of the usual "firefox slow, internet bad" → "read the faq" problems as far as I can tell.

The problem: When using Firefox (110.0 64-bit Windows 10) I noticed already a while ago that downloads are slow, apparently frozen from time to time, websites took longer to load and looking at speed tests, I got really bad results. Furthermore, Firefox seems to slow down my internet speeds of the whole system, as I can observe in other applications which want to download or upload data. As long as Firefox is running (even if I am just in the default tab and doing nothing in Firefox) it slows the internet speed of the whole system down.

So I tried a plethora of things to fix this and I can rule out the following possible causes with high confidence:

• History, Cache, Add-Ons and so on: performed a clean re-install of Firefox, cleared all cache and history data, removed add-ons, reset to default, etc..
• ISP problem: performed repeated speedtests from other devices within the network, everything is fine within my local and wide area network, ISP does not report any problems
• Firewall & AV: turning on / off, even uninstalling, no effect observed
• Driver problem: driver updated, driver removed, used default Windows Driver, used Troubleshooter etc., nothing helped.
• OS issue: Nope. I even performed a clean new installation of Windows today, the problem remains. Furthermore: I ran the speedtests using Microsoft Edge and there are no issues (as long as Firefox is not running.)
• HW / System issue: Nopes again. I have used a live Ubuntu-image to cross-check whether the HW might be an issue, but running speedtests using Ubuntu and Firefox worked well.

I did not observe similar effects on other machines using Firefox under Windows in my network. So it seems to be a very specific problem within Firefox under Windows 10 on my machine.

By the way the machine: HP Pavilion Gaming - 15-dk0200ng CPU: Intel Core i5-9300H RAM: 16 GB DDR4-2666 SDRAM WiFi: Realtek RTL8822BE 802.11ac (via PCIe) (I also have an Ethernet chipset on this system, but since I have tested everything using only WiFi I'll omit the info here.)

So is this a bug of Firefox? Or am I missing something?

Attached are some screenshots of the disappointing test results using Firefox. (I have similar problems on other sites like speedtest.net or the speedtest of Google). As reference: I've got 500 Mbit/s downstream and 50 Mbit/s upstream. Usually these speeds are achieved from other devices (or other browsers on my system), or are at least within the top 80%. But what I get with Firefox is significantly worse. It's also strange that the speed goes up first, which is fine, but then falls down completely after reaching some point. A few seconds after that it goes up again, but much much slower.

Thanks in advance for any help!

Why am I locked out. I play every day and today I can't get through and Google said it might be a Cookies issue. Need help please. Not very savy re. Cookies. I am a Senior.

This issue occurred in firefox browser (110v), i can't open picture into another tab without a warning, reddit video player won't play, my home menu not appeared properly, bookmark also.

"Websites prove their identity via certificates. Firefox does not trust this site because it uses a certificate that is not valid for i.redd.it. The certificate is only valid for the following names: default.ssl.fastly.net, fastly.com, *.a.ssl.fastly.net, *.hosts.fastly.net, *.global.ssl.fastly.net, *.fastly.com, a.ssl.fastly.net, purge.fastly.net, mirrors.fastly.net, control.fastly.net, tools.fastly.net

Error code: SSL_ERROR_BAD_CERT_DOMAIN"

When using Google Chrome, I can click on a telephone link and it brings up a dialog box asking if I want to make a call using my mobile phone.

Is this possibly with Firefox?

Not sure what topic this falls under but...Sometime in the last couple weeks, Firefox doesn't want to connect to Facebook or You Tube. Just these 2 sites. All the other bookmarks and quick links on my home page work fine. If I clear my data and cookies and re-start FF it sometimes connects, sometimes doesn't, and sometimes opens FB in what looks like a safe mode screen (https?). Vexing me as to what the issue is. Updated FF, Windows, re-installed FF, refreshed it, and finally came here looking for a way to restore the default settings for FF. Since FB and YT are Alphabet companies, have they done something that's messing with FF?

Hi! I am hiding the toolbar when browsing web pages to maximize the screen spaces. However, when playing full-screen videos (all HTML5 videos), the lowest part of the video are missing. It seems like that part are squeezed out of the screen. If I uncheck the "hide toolbar" function, it fixed. See the lowest part of the attached image.

I'm using the ff dev edition, 110.0b6, but the bug also happens on my ff 109.0 OS: MacOS 13.2

Dear Team,

I am facing problem while browsing my site in private windows i am getting this below error please look into this and update as soon as possible.

hullom snce several days I canot login to my nextcloud anymore, not with any of my different user names. Nextcloud will show a login screen, I can enter my credentials, Firefox will try to connect and after a while present me a fresh empty login screen. On one of my other macs (same OS) Firefox does login ok. After deleting Firefox app and reinstalling Firefox again, the behaviour does not change. Also deleting the stored login names and passwords does not help, deleting a bunch off cookies neither. What else could I do?

I am using Firefox Developer Edition Version: 110.0b5 (64-bit) on M1 Mac running Ventura 13.1.

I am building an webapp some XHR triggering in background but it is not necessary to run the application (running fine on other browsers). But on Firefox Developer Edition, It shows a error window with the message and stops loading the application.

Firefox can’t establish a connection to the server at localhost:4000.

localhost:4000 is the failing XHR request domain. I have attached the screenshot.

How to ignore the XHR failing errors just like other browsers?

After re-starting my iMac the wrong characters appear for non-letter characters such as punctuation, which you can see in the screenshot from the pocket recommendations on the home page, where the issue doesn't appear too bad, but in practice trying to use any site with form inputs asking for email addresses etc. is impossible.

This has happened in the past and I have somehow been able to fix it, but this time nothing I've done helps. (It's only ever Firefox that is affected.)

I have deleted the app and re-installed it. I have cleared cache and cookies. I have cleared all browser history etc. I have tried changing fonts from the defaults. I'm not sure there are any other troubleshooting steps I can take.

I'm using FF developer edition, current version (just re-installed it, but it is always up-to-date, and this has been happening for a year or two). MacOS 12.6.3.

I'm a long-time FF user and until now I've lived with this inconvenience as I've somehow fixed it after troubleshooting steps, but this time I can't stumble upon the solution.

So I I've been holding out upgrading to W11 for some time now, but have to upgrade after being tipped by a friend about ONE convenient feature for multitasking, split apps view and combining it into one tab. So far so good, didn't experience any issue. One complain I have is the gigantic cut, copy, open..etc Tab at the top of the new file explorer. But, again, nothing out of the ordinary.

But when I opened Firefox for the first time after upgrading I noticed a painful delay before actually loading the new pages. At first I thought it was only because I just recently updated the OS, so I leave for few hours and keep working my docs. After going back to browse I still have the same issue. This time I notably irritated because of browsing my regularly checked websites have so much delay now compared to before I upgrade to W11.

Here's the list of thing I tried to fix this issue.

   Clearing caches

   Disabling add ons

   Disable enhanced protection

   Refresh Firefox program

   Updating my chipset driver 

   updating my gfx driver

   Reseting my network.

Nothing I tried above worked.

Again the issue is not internet speed. When I downloaded the AMD drivers, it was 14MBps, quite fast.

Then I open the "task manager" and tick the "always on top" option. I noticed that Firefox is still idling even after I clicked links in my homepage. Firefox only uses 2% of CPU usage. It stays that way for 4-11 seconds (depending on the websites I tested) before eventually ramps up the CPU usage to the percentage I expected to opens a new website.

Anyone knows the answer? Please I'm getting desperate here. I don't want to daily drive chromium forks and would like to keep using Firefox.

Asus vivobook laptop, Ryzen 5 3500u, 16gb 2666mhz ram

hey, i couldn't find any option for it, so i'm asking here. i switched from chrome to firefox but i noticed that once you reach a certain amount of tabs, you need to start scrolling through your tabs. how do i make it so, that all tabs are visible at once and theres no need for scrolling ? thank you