Firefox Community Forum

After being able to view Netflix content on Firefox for, well, a long time, today I encountered audio with no video. Only a black screen. I contacted Netflix and they're telling me that Firefox needs updating - we tested Safari and it was able to play the entire content, video and audio. I checked Firefox and the info states the browser is up to date. I should add I'm on a Macbook Pro. The quality on Safari was not as good as Firefox has been so I would prefer not to have to use a second browser for one task. Can anyone provide some information on this situation?

I have my browser.sessionstore.max_windows_undo in about:config set to 60 – it's been like this and working fine for several months.

It's set to this high number because I use an assistive technology which creates a fresh pop-up every time I deploy it, and Firefox treats it as a browser window closure when I close the pop-up. Consequently, I can easily rattle through well over 25 window closures in a day.

It's not necessarily that each window contains dozens of tabs and copious data, but nevertheless Firefox still treats it as a window 'within the meaning of the act'!

I just went to reopen one closed window from a couple days ago which did contain many tabs (partly why I closed it in the first place), only to find that the 'recently-closed windows' context menu is now only showing 20 windows (18 of which are the aforementioned pop-up assistive technology windows)

The really vital window that I want to reopen is not showing.

I've double checked in about: config and the browser.sessionstore.max_windows_undo is still set to 60 windows; nothing has been altered or reset.

I updated Firefox to 147.0.4 yesterday evening, but the problem existed before I updated Firefox, and is still in evidence since updating.

Two questions:

1) Why is the Recently Closed Windows context menu not showing the full number of windows it has been successfully doing with no problem now for months? I used to have to scroll down to access the full extent of the 60, but they were always there.

2) Why has it arbitrarily changed to 25 windows?

3) [I lied – Our chief weapons etc...] Is there a way that – given about:config still implies that the most recent 60 windows are retrievable – that I can access beyond the 25 windows limit that are currently showing as reopenable?

Thanks very much

(And yes, I already have things like OneTab and Tab Session Manager add-ons, but disabled those just before closing the important window, because I was trying to locate which add-on was draining the CPU. I assumed my 'recently-closed windows' buffer of 60 would suffice while I disabled the add-ons.)

As long as my computer doesn't go to sleep Im fine. If it does, when i open firefox, i must refresh to be able to find my bookmarks and passwords. What am I doing wrong? Thanks in advance! Micha

This appears to be a new "feature" that is absolutely insanely stupid.

There are websites that use a phone number as a user ID and now, instead of that number being remembered by Firefox as a user ID, Firefox now inserts a list of EVERY possible phone number you've ever typed, for you to chose from. The irony in my case being that the phone number in question that was being used as a user ID, is NOT in the list.....

Anyone know how to turn it off? Thanks - Brett

After the most recent upgrades (both MacOS to 26.4 beta and Firefox 147.0.4), Firefox is giving me this message: Hmm. We’re having trouble finding that site. Any suggestions?

My folders with links have disappeared, but the links are all listed separately. I can't create new folders because it says I already have a folder with that name. But I don't see any Folders just all links.

Thank you,

Jeffrey Grabelle [edited email from community support forum]

When I wake up Firefox from sleep overnight, it is unresponsive until I force quit. I am on v147.0.4 on my M4 Mac Mini. It doesn't happen in shorter sleep periods. I can click something in it and then when I switch to another app, it responds. But the browser on normal interactions won't respond at all.

Can log on to the Google Maps Web Site OK. However, trying to log on to my Google account (in Google Maps) I get the following message: "We've detected a problem with your cookie settings. ". If I try 'Private Browsing' in Firefox (CTRL-SHIFT-P) I am able to log in. However, this seems to have lost all of the Open tabs that I had in 'ordinary' Firefox.

Almost every time I open up Firefox it has a little pop-up under the tool bar asking "Open Firefox every time you restart your computer?", and every time I select "Not now", which I guess is intended as only a temporary answer. How can I permanently say "No" and keep this from popping up constantly?

Both the menu and the taskbar are not available since the latest update a few days ago. I've searched all options in Firefox settings with no luck in finding a solution. Help would be appreciated as this is extremely annoying and working around it wastes a whole lot of time.

Scroll bar issue on some websites When accessing certain websites, the scroll bar disappears (for me, it's on the right side of the screen), and it's no longer possible to view the page content, even using the keyboard's scroll keys.

DETAILS Only affects certain websites Firefox is up to date No blocking extensions are installed Access is possible with another browser Thank you for your feedback, Sincerely, F. Vernoux

barre de défilement pour certains sites Lors de l'accès à certains sites la barre de défilement disparaît (pour moi à droite sur l'écran) et il n'est plus possible de consulter le contenu de la page même avec l'utilisation des touches de défilement du clavier; PRECISIONS Concerne seulement certains sites Firefox version à jour Pas d'extensions bloquantes Accès possible avec un autre navigateur Merci de votre retour, Cordialement, F. Vernoux

Images appear fine, but lately I cannot see embedded videos on websites when I'm browsing. This is a recent change (past couple of weeks).

I can view the same videos using another browser, so I think this is a firefox setting possibly.

While watching netflix, I randomly get error code F7361-1253 which prevents the video from playing. Can happen at any random time while watching. I have had firefox for years and have only got this issue in the past few months. It does not happen on other browsers like chrome.

I have tried disabling all extensions and troubleshoot mode, doesn't fix it. I didn't change any firefox settings since this started happening. DRM is enabled, widevine is the latest version, so is firefox, fully updated. I am using Windows 11 Home, 10.0.22631 Build 22631

These are the warnings I got in the console as soon as the netflix error pops up:

Cannot play media. No decoders for requested formats: audio/mp4; codecs="mp4a.40.42" 81036307

Media resource blob:https://www.netflix.com/6bc68eac-89ce-4b21-afcd-f78b0a3908ce could not be decoded. 81036307

This error message will be blank when privacy.resistFingerprinting = true. If it is really necessary, please add it to the whitelist in MediaError::GetMessage: ipc::IPCResult __cdecl mozilla::gmp::ChromiumCDMParent::RecvDecodeFailed(const uint32_t &): ChromiumCDMParent::RecvDecodeFailed with status kDecodeError (5) cadmium-playercore-6.0055.308.911.js:1:568518 WEBGL_debug_renderer_info is deprecated in Firefox and will be removed. Please use RENDERER. cadmium-playercore-6.0055.308.911.js:1:372306

Media resource blob:https://www.netflix.com/6bc68eac-89ce-4b21-afcd-f78b0a3908ce could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) Details: ipc::IPCResult __cdecl mozilla::gmp::ChromiumCDMParent::RecvDecodeFailed(const uint32_t &): ChromiumCDMParent::RecvDecodeFailed with status kDecodeError (5)

I have ffmpeg on my system and haven't touched it in a while.

I have around 20 tabs in my firefox browser about tarding they all keep refreshing at the background when i am using firefox,its causing my Laptop battery drainage