Firefox 社群討論區

Good afternoon

recently i tried just realise my firefox can't played HEVC streaming video like twitch etc. (1st pictures)

i check on other browser such as Chrome, Edge, etc. it's played normal i check on google all about config

like media.wmf.hevc.enabled , media.hevc.enabled , dom.media.webcodecs.h265.enabled all set to true. checking on about:support i found it's not supported (2nd screenshot)

i check on Powershell are like this :

C:\WINDOWS\system32> Get-AppxPackage | Where-Object {$_.Name -like "*HEVC*"}

Name  : Microsoft.HEVCVideoExtension Publisher  : CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US Architecture  : X64 ResourceId  : Version  : 2.5.33.0 PackageFullName  : Microsoft.HEVCVideoExtension_2.5.33.0_x64__8wekyb3d8bbwe InstallLocation  : C:\Program Files\WindowsApps\Microsoft.HEVCVideoExtension_2.5.33.0_x64__8wekyb3d8bbwe IsFramework  : False PackageFamilyName : Microsoft.HEVCVideoExtension_8wekyb3d8bbwe PublisherId  : 8wekyb3d8bbwe IsResourcePackage : False IsBundle  : False IsDevelopmentMode : False NonRemovable  : False IsPartiallyStaged : False SignatureKind  : Store Status  : Ok Capabilities  : inProcessMediaExtension,

                   uniqueAppPackageCapability

in summary it's installed and running.

i will be happy if you can guide me on how to enable it. because tbh Firefox are my daily drive

thanks before

115.40.0esr on Mac OS High Sierra v. 10.13.6

When attempting to enter log in information automatically, the expected notification appears and is confirmed, but the "Logins & Passwords" repository remains empty.

When attempting to enter log in info manually, from the "Logins & Passwords"page, the error message "an error occurred while trying to save this password" pops up after filling the fields under "Create New Login" and hitting the "Save" button.

I know I'm working on borrowed time with this setup, but I'd like to squeeze as much life as I can out of this old Mac, and having a functioning password manager is high priority.

Most up to date firefox version, on new page i try to customise using the customise pencil icon, i try to change image to jpg files image or firefox own wallpapers and it won't work; themes of top bar are working. Not tried changing with theme (i.e. wallpaper theme), but presume that may work, also i tried undoing the themes and contrast stuff as mentioned online, but still not working and I also tried restarting firefox, but still same issue.

From time to time, sometimes after Firefox updates, I get unintelligible characters on tabs, search bar on Firefox. It gets more frustrating because the issue extends to the Settings menu, so applying the fixes I see on the web is definitely not easy.

I am on macOS, a newer chip and below is what I tried.

Restarting Firefox Checking the library for duplicate font installations. Disabling the extensions Starting Firefox on troubleshoot mode Uninstalling/reinstalling Firefox Uncheck Use recommended performance settings (blindfolded by using the search panel under Firefox Settings) Uncheck Use hardware acceleration when available (blindfolded by using the search panel under Firefox Settings)

Hello,

1. sync
2. widgets

Unfortunately, not all settings are synchronised when I sync my settings through my connected Firefox/Mozilla account.

For example, the following `about:config` preference is not saved:

`browser.newtabpage.activity-stream.widgets.system.enabled = true`

In addition, several settings from the regular Settings menu are not synchronised either, including:

- Start page settings - The custom ordering of search engines under **Search** - The option to NOT save payment methods & addresses - The option to NOT automatically trust installed certificates - secure DNS over HTTPS (DoH) activated with provider & fallback behaviour set

This is frustrating because I have to go through all the settings again after syncing. In some cases, the behaviour also seems inconsistent—for example, the checkbox for automatically trusting installed certificates does not always retain its selected state (sometimes it is unchecked[desired] and on other occasions it is checked).

Could you please investigate whether these settings are intended to be synchronised and, if so, why they are not being saved?

A reliable sync feature should reproduce the desired configuration consistently, including all stable settings—or, at a minimum, clearly document which settings are excluded from synchronisation.

Best wishes, RaphiQ

Latest Stable Firefox, windows, over 4000 tabs. Overall Firefox works great for me. but when I restart it to install the latest versions etc, it only restores one active/loaded tab per window. Rest are restored, but in a closed/unloaded state. I usually have 5-20 open tabs per window, and hundreds more unloaded, it's how I work. How on earth can I get it to restore all the open/loaded tabs as they were, not in the unloaded state they default to?

Issue still occurs in a new install with no addons, default settings, under 30 tabs etc. Ditto Win 10 or 11.

Also, how on earth can I get official Mozzilla pages to use Dark Mode??

How can I stop Firefox from automatic granting sites cross-site cookie permissions (see screenshot)? The problem is that the cross-site cookie(s) granted for a site more often than not is completely unrelated to that site. This problem is very frustrating.

I have tried changing several settings in Tracking Protection but nothing has stopped Firefox from auto-granting these permissions. I have for example turned off "Fix major site issues (recommended)" but it has not changed this behavior.

Thankful for any help.

Hi!

We have a intranet site that works in Edge and Chrome without issues with the site added to "internet options". But for some reason we are getting 401 Unauthorized when trying to access it from Firefox. I have tried adding the urls to: network.automatic-ntlm-auth.trusted-uris network.automatic-ntlm-auth.allow-proxies: true network.automatic-ntlm-auth.allow-non-fqdn: true network.auth.force-generic-ntlm: false network.auth.force-generic-ntlm-v1: false

Ingocnito mode , same error. I have tried disabling all plugins. Disabled DNS over HTTPS.

HTTP/1.1 401 Unauthorized Server: Microsoft-IIS/10.0 WWW-Authenticate: Negotiate X-Powered-By: ASP.NET Date: Mon, 25 May 2026 08:15:41 GMT Content-Length: 0

Regards Rasmus

starting about a month ago, my Firefox browser has become very slow. Sometimes now when I click a link (this happens about every 4-5 links) the spinning wheel of death appears and the browser doesn't respond. I have to force-quit

For some reason, my Gmail page doesn't show the icons on top at all. Like the archive, mark as read, and the others on top of the mailbox contents. They show up on both Chrome and Edge, so this seems to be a Firefox problem.

Computer being used with issue: HP ProDesk 600 G2 DM (Windows 10, 16GB RAM) So can this be fixed or should I just use my phone for Gmail?

The Smart Window feature caused CPU usage and memory to max out. Disabled it as soon as I could find the setting to do so (Settings/AI Controls and BLOCK "Smart Window") and overload disappeared immediately. Everything is working fine now. What a disaster! Also did not find the interface terribly impressive or informative. Quite the opposite: It was almost deliberately vague and not at all intuitive.

Contrary to the claim that "Smart Window automatically groups related tabs, so everything has its place and what you need is easy to find" it just just described each of my open tabs (despite several related tabs being right next to each other) instead of supposedly grouping them by subject matter. That's basically useless -- I can see that for myself. Definitely not ready for Primetime.

Windows 10 Home, Firefox Version 155.0.1 (64-bit), Dell Inspiron 15 3000, installed RAM 8.00 GB, Storage 119 GB

Yes, I've been contemplating adding memory and/or buying a new laptop. But a new feature shouldn't totally freak out my system without some sort of appropriate warning about memory prerequisites, etc.

I am suddenly finding I cannot scroll a thread in Chatgpt! What changed in the last 2 days? It has been working fine for 2 years. I am on OS mojave 10.14.6 on a 2015 Model Imac.

Pas moyen d'ouvrir Firefox depuis une clé usb de démarage. On me demande un code par courriel que je ne peux pas ouvrir. Je suis bloqué car je tombe toujours sur le Bios quand je veux avoir accès à mon ordinateur. Commenr m'en sortir De l'aide SVP Merci

Depuis Firefox 150 il ne m'est plus possible de Glisser-Coller un dossier avec ses fichiers dans un dossier de mon NAS Synology. Le service d'assistance Synology m'a apporté confirmation. Voir sa note en attaché.

Il semble qu'il y a un "bug" dans Firefox 150 et plus (j'ai le 155.0.1) pour ce Glisser - Coller ?

Que puis-je faire ?