Diễn đàn hỗ trợ Firefox

As of 7/10/2025, Xfinity Streaming does not open through Firefox. I much prefer Firefox to any other browser so I am a little mystified as to why all of a sudden Xfinity Streaming does not open. I receive my Comcast email through FireFox but when it comes to streaming content, the Xfinity logo just sits there and does not open.

After tinkering with about:config (shouldn't have...) the background of every page that does not specify a body background color turns the color of my theme background color.

Using the firefox color pipette says its white, but it clearly isn't.

The theme i have is dark, making any page that expects the background to be white unreadable (without DevTools -> Body -> background-color: white)

I haven't been able to find the config that fixes it.

Hi, I have the settings of 'General > Startup > [checked] Open previous windows and tabs' on. Most of the time it works as expected, but there are several occurrences when all of the sudden all of my pinned tabs are gone. When this happened, I usually tried the 'Command + Shift + T' to restore them. Sometimes they came back, some other times, they don't.

Can you fix it?

It's starting to get really irritating because I can have >12 tabs pinned and it's troublesome to have to remember them all in case this happens again in the future.

Thanks!

Please I want to remove Ai from Firefox Mozila permanently on Windows 11 for all users/profiles:

I tried a lot of workarounds but they are unsuccessfully: I tried to create extensions (Hide Gemini, AI Google Overview), but they do not work for all users; only profile-based extensions are supported. I tried to use preferences using internal settings on Firefox, but it does not apply to all users. I tried using a script on PowerShell for all users merging internal preferences, but it does not work I copied the local and roaming settings from Firefox to the Default profile, but it was unsuccessful.

I also tried to remove "All" from the search page, but I moved the seach to go to the tab "Web" only.

Reference: https://gist.github.com/gene1wood/0bd4250ffef9d57fd801d59f23433114 https://www.maketecheasier.com/disable-ai-models-firefox/ https://www.askvg.com/how-to-disable-and-remove-all-ai-features-in-mozilla-firefox/

Thank you for any help and feedbacks. --Rod

Hi, when I want to zoom in to the website page, I cant seem to find the horizontal scroll, thus I cant see the left side of the page that I zoomed in. Please make the horizontal scroll available. Thank you.

I have asked this question before and followed ALL recommendations to no avail. I received no other suggestions to now, nearly a year later I am asking this question again. I had to stop using my favorite browser because of this. You all used to help your users but alas, no more. Here is a link to my previous question and then below is my present question;

https://support.mozilla.org/en-US/questions/1473866

I am running a fully updated Windows 11 computer. I have 4 fully up to date browsers; Vivaldi 7.5.3735.66 (Stable channel) (64-bit); EDGE Version 139.0.3405.125 (Official build) (64-bit); DuckDuckGo version 0.126.3; and Firefox 142.01. I play Bejeweled Blitz on FaceBook. The game works perfectly on all browsers EXCEPT Firefox. When I try to play on Firefox I get a message that says I must "upgrade to the latest version of Flash:. There is NO flash anymore. Why am I getting this message on Firefox but the game works just fine on all other browsers?

After my bitwarden add-on failed me, I remembered ChatGPT helping me with this another time - but I got it wrong. I right clicked the extensions button (I have 3 add-ons falling under that button) and removed from tool bar, thinking I could then reinstall it and the Bitwarden issue would rectify.

Instead, the extension icon disappeared, and is nowhere to be located. ChatGPT wants to do some reconfiguring but surely there's a better way. I have looked in "customise toolbar" (ie, right click toolbar, click customise toolbar and look for the icon" - but the puzzle piece icon is not there.

Surely I have hidden the puzzle piece icon somehow and I need to do some sort of magic to make it reappear... Have never had this issue with Firefox previously.

After recent update, I can not browse any addons. The site https://addons.mozilla.org does not open, shows the connection timed out. I uninstalled and reinstalled firefox deleteting all firefox related files. The problem still persists. Other than this all the using browsing I do are all working fine. Just this extensions I cannot browse. When I click the extension icon by default it shows some extensions, I can Install them. The problem is I can not browse them. Even the recomendation tab is also empty.

PS: I am using firefox on manjaro linux.

After upgrading my 128 esr to 140 esr, some sites stopped opening. In regular versions, it has not opened for a long time. There are many such sites, for example, qwen3.app or temp-mail.io. It thinks for a long time and finally a message that the time has expired. Chromium is ok.

https://www.datilcam.com/weather/index.htm

The website you are blocking is on my domain and is my website. Why are you blocking it? Stop blocking it!

for some weeks now, Firefox (latest, in Windows) crashes, or says 'not closed properly' and shows (usually) 12 'instances' in Task Manager when only one tab has been opened. I'm not techie, and need clear advice. Can anyone help please? Hugh, UK

Hi!

Please see attached image:

Left: Edge (making sure it isn't a network issue)

Right: Firefox using a new profile from about:profiles.

On my main profile, I've tried clearing the data and cookies (though not the history) a couple of weeks back.

Any suggestions welcomed! Many thanks in advance.

My laptop unexpectedly closed Firefox after it crashed and upon a restart I re-opened Firefox, which normally restores all my open windows/tabs from the very last session no problem whenever it force quits due to laptop crashes. But this time when opening, it restored windows/tabs from almost a month ago. I closed Firefox and checked the sessionstore-backups folder: - the recovery-backup files are from the session date I just re-opened with old tabs - the previous.jsonlz4 file is from about a month ago and seems to be the reference point used when restoring tabs rather than my actual last session

Is there any other file or method I could use to recover my actual prior session tabs before it crashed?

I have not re-opened Firefox since quitting the browser after seeing it restored the old tabs.

Thank you in advance!

Hello,

i was trying to check my apparmor stuff because of the warning on Linux. Now i tried duck.ai to instruct me , but created more damage than anything else. It said to set firefox in enforcement mode, now it wont start (well im using Firefox right now in complain mode)

How do I fix this problem that everything runs normally and safe?

Please help me! madmorph666@madmorph666-E14301:~$ sudo aa-complain /usr/bin/firefox /usr/bin/firefox wird in den Complain-Modus versetzt. madmorph666@madmorph666-E14301:~$ firefox ATTENTION: default value of option mesa_glthread overridden by environment. [Parent 72019, Main Thread] WARNING: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed [Parent 72019, Main Thread] WARNING: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed [Parent 72019, Main Thread] WARNING: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed [Parent 72019, Main Thread] WARNING: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed [Parent 72019, Main Thread] WARNING: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed [Parent 72019, Main Thread] WARNING: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed [Parent 72019, Main Thread] WARNING: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_widget_get_clipboard: assertion 'gtk_widget_has_screen (widget)' failed [Parent 72019, Main Thread] WARNING: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(firefox:72019): Gtk-CRITICAL **: 03:12:17.894: gtk_clipboard_request_contents: assertion 'clipboard != NULL' failed ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. [Child 72430, Main Thread] WARNING: Unable to open /var/lib/flatpak/exports/share/dconf/profile/user: Keine Berechtigung: 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

(/usr/lib/firefox/firefox-bin:72430): dconf-WARNING **: 03:12:53.181: Unable to open /var/lib/flatpak/exports/share/dconf/profile/user: Keine Berechtigung ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment.

Hi! I'm on a relatively new to me (refurb) desktop computer running Win 10 Pro (64 bit)* and Firefox 143.0.3.

In the past week both Firefox and Win 10 have updated. I don't know what happened, but now when I boot up or reboot, my computer opens to MS Edge. Yuck!

Every single time I have to reinstall Firefox! Once I do that, all is well again. I have all my bookmarks back, etc.

It also keeps changing my "default to Firefox" browser setting, turning it OFF, while I'm using Firefox. I repeatedly have to keep going in and clicking to make FF to the default browser again.

Why is it doing this? How do I stop it?

Anyway, I know I can't delete Edge or uninstall it. How do I shove it back into the black hole it has lived in until now?

Thanks very much in advance for any help offered. :)

KathyOnOBX

• (Nope - computer not eligible to upgrade to Win 11. My processor isn't fast enough, I think.)

When logging in to a website that I use many times every day all day, all of a sudden I log on and all I get is a blank white screen. I have tried clearing everything, restarting Firefox, removing Firefox and re-installing it, rebooting the computer, starting Firefox in the safe mode but no change. The same problem shows up on three different computers on two different networks with two different ISPs. The website opens normally on Edge and Chrome. I would prefer to be able to use Firefox. Using version 139.0.4 (64-bit) on all three computers. I would really appreciate any help that is available.

how come when ever i install any antivirus except for windows defender do i get this in Firefox Your browser is being managed by your organization. i went to policies but do not know what to do why can this not be removed from Firefox what do i need to do in policies to get rid of this. here is what i get in policies did not remove any thing this is what i get help please thi is documentation in policies.. Documentation Policy Name 3rdparty Set policies that WebExtensions can access via chrome.storage.managed. AllowedDomainsForApps Define domains allowed to access Google Workspace. AllowFileSelectionDialogs Allow file selection dialogs. AppAutoUpdate Enable or disable automatic application update. AppUpdatePin Prevent Firefox from being updated beyond the specified version. AppUpdateURL Set custom app update URL. Authentication Configure integrated authentication for websites that support it. AutofillAddressEnabled Enable autofill for addresses. AutofillCreditCardEnabled Enable autofill for payment methods. AutoLaunchProtocolsFromOrigins Define a list of external protocols that can be used from listed origins without prompting the user. BackgroundAppUpdate Enable or disable the background updater. BlockAboutAddons Block access to the Add-ons Manager (about:addons). BlockAboutConfig Block access to the about:config page. BlockAboutProfiles Block access to the about:profiles page. BlockAboutSupport Block access to the about:support page. Bookmarks Create bookmarks in the Bookmarks toolbar, Bookmarks menu, or a specified folder inside them. CaptivePortal Enable or disable captive portal support. Certificates Add certificates or use built-in certificates. Containers Set policies related to containers. ContentAnalysis Enable or disable connection to data-loss-prevention agent. Cookies Allow or deny websites to set cookies. DefaultDownloadDirectory Set the default download directory. DisableAccounts Disable account-based services, including sync. DisableAppUpdate Prevent the browser from updating. DisableBuiltinPDFViewer Disable PDF.js, the built-in PDF viewer in Firefox. DisabledCiphers Disable ciphers. DisableDefaultBrowserAgent Prevent the default browser agent from taking any actions. Only applicable to Windows; other platforms don’t have the agent. DisableDeveloperTools Block access to the developer tools. DisableEncryptedClientHello Disable use of the TLS feature Encrypted Client Hello (ECH). DisableFeedbackCommands Disable commands to send feedback from the Help menu (Submit Feedback and Report Deceptive Site). DisableFirefoxAccounts Disable account-based services, including sync. DisableFirefoxScreenshots Disable the Firefox Screenshots feature. DisableFirefoxStudies Prevent Firefox from running studies. DisableForgetButton Prevent access to the Forget button. DisableFormHistory Don’t remember search and form history. DisableMasterPasswordCreation If true, a Primary Password can’t be created. DisablePasswordReveal Do not allow passwords to be revealed in saved logins. DisablePocket Disable the feature to save webpages to Pocket. DisablePrivateBrowsing Disable Private Browsing. DisableProfileImport Disable the menu command to Import data from another browser. DisableProfileRefresh Disable the Refresh Firefox button in the about:support page. DisableSafeMode Disable the feature to restart in Safe Mode. Note: the Shift key to enter Safe Mode can only be disabled on Windows using Group Policy. DisableSecurityBypass Prevent the user from bypassing certain security warnings. DisableSetDesktopBackground Disable the menu command Set as Desktop Background for images. DisableSystemAddonUpdate Prevent the browser from installing and updating system add-ons. DisableTelemetry Turn off Telemetry. DisableThirdPartyModuleBlocking Prevent the user from blocking third-party modules that get injected into the Firefox process. DisplayBookmarksToolbar Display the Bookmarks Toolbar by default. DisplayMenuBar Display the Menu Bar by default. DNSOverHTTPS Configure DNS over HTTPS. DontCheckDefaultBrowser Disable check for default browser on startup. DownloadDirectory Set and lock the download directory. EnableTrackingProtection Enable or disable Content Blocking and optionally lock it. EncryptedMediaExtensions Enable or disable Encrypted Media Extensions and optionally lock it. ExemptDomainFileTypePairsFromFileTypeDownloadWarnings Disable warnings based on file extension for specific file types on domains. Extensions Install, uninstall or lock extensions. The Install option takes URLs or paths as parameters. The Uninstall and Locked options take extension IDs. ExtensionSettings Manage all aspects of extension installation. ExtensionUpdate Enable or disable automatic extension updates. FirefoxHome Configure Firefox Home. FirefoxSuggest Configure Firefox Suggest. GoToIntranetSiteForSingleWordEntryInAddressBar Force direct intranet site navigation instead of searching when typing single word entries in the address bar. Handlers Configure default application handlers. HardwareAcceleration If false, turn off hardware acceleration. Homepage Set and optionally lock the homepage. HttpAllowlist Origins that will not be upgraded to HTTPS. HttpsOnlyMode Allow HTTPS-Only Mode to be enabled. InstallAddonsPermission Allow certain websites to install add-ons. LegacyProfiles Disable the feature enforcing a separate profile for each installation. LegacySameSiteCookieBehaviorEnabled Enable default legacy SameSite cookie behavior setting. LegacySameSiteCookieBehaviorEnabledForDomainList Revert to legacy SameSite behavior for cookies on specified sites. LocalFileLinks Allow specific websites to link to local files. ManagedBookmarks Configures a list of bookmarks managed by an administrator that cannot be changed by the user. ManualAppUpdateOnly Allow manual updates only and do not notify the user about updates. MicrosoftEntraSSO Allow single sign-on for Microsoft Entra accounts. NetworkPrediction Enable or disable network prediction (DNS prefetching). NewTabPage Enable or disable the New Tab page. NoDefaultBookmarks Disable creation of the default bookmarks bundled with Firefox, and the Smart Bookmarks (Most Visited, Recent Tags). Note: this policy is only effective if used before the first run of the profile. OfferToSaveLogins Enforce the setting to allow Firefox to offer to remember saved logins and passwords. Both true and false values are accepted. OfferToSaveLoginsDefault Set the default value for allowing Firefox to offer to remember saved logins and passwords. Both true and false values are accepted. OverrideFirstRunPage Override the first run page. Set this policy to blank if you want to disable the first run page. OverridePostUpdatePage Override the post-update “What’s New” page. Set this policy to blank if you want to disable the post-update page. PasswordManagerEnabled Enable saving passwords to the password manager. PasswordManagerExceptions Prevent Firefox from saving passwords for specific sites. PDFjs Disable or configure PDF.js, the built-in PDF viewer in Firefox. Permissions Configure permissions for camera, microphone, location, notifications, and autoplay. PictureInPicture Enable or disable Picture-in-Picture. PopupBlocking Allow certain websites to display popups by default. PostQuantumKeyAgreementEnabled Enable post-quantum key agreement for TLS. Preferences Set and lock the value for a subset of preferences. PrimaryPassword Require or prevent using a Primary Password. PrintingEnabled Enable or disable printing. PrivateBrowsingModeAvailability Set availability of private browsing mode. PromptForDownloadLocation Ask where to save files when downloading. Proxy Configure proxy settings. RequestedLocales Set the list of requested locales for the application in order of preference. SanitizeOnShutdown Clear navigation data on shutdown. SearchBar Set the default location of the search bar. The user is still allowed to customize it. SearchEngines Configure search engine settings. This policy is only available on the Extended Support Release (ESR) version. SearchSuggestEnabled Enable or disable search suggestions. SecurityDevices Add or delete PKCS #11 modules. ShowHomeButton Show the home button on the toolbar. SkipTermsOfUse Do not display the Terms of Use and Privacy Notice upon startup. You represent that you accept and have the authority to accept the Terms of Use on behalf of all individuals to whom you provide access to this browser. SSLVersionMax Set the maximum SSL version. SSLVersionMin Set the minimum SSL version. StartDownloadsInTempDirectory Force downloads to start off in a local, temporary location rather than the default download directory. SupportMenu Add a custom support menu item to the help menu. TranslateEnabled Enable or disable webpage translation. UserMessaging Don’t show certain messages to the user. UseSystemPrintDialog Print using the system print dialog. WebsiteFilter Block websites from being visited. See documentation for more details on the format. WindowsSSO and this Certificates ImportEnterpriseRoots true