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MP4 files won't work in Firefox

As the title says, I cannot get MP4 files to play in Firefox, which renders several websites unusable. These sites work in Edge just fine, but I cannot get them to work i… (read more)

As the title says, I cannot get MP4 files to play in Firefox, which renders several websites unusable. These sites work in Edge just fine, but I cannot get them to work in my preferred browser. Everything is up to date, and I have all the codecs I could ever need installed, as well as the Windows N Media Feature Pack. The browser has been tested several times in troubleshooting mode, and I've even gone as far as running Windows in safe mode with networking to try to isolate the issue. I cannot get it to work at all. This is the 2nd device I've had this issue on, and it's driving me up a wall.

Any help or advice would be greatly appreciated.

Firefox 103.0 (64-bit) Windows 10 Pro N 21H2 19044.1865

Asked by natas.hastings 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Zoom meeting links not opening

This morning I re-installed an update to Zoom (on Linux - ElementaryOS / Ubuntu 18.04). Since installing, I've not been able to follow links from Firefox to Zoom (zoommt… (read more)

This morning I re-installed an update to Zoom (on Linux - ElementaryOS / Ubuntu 18.04). Since installing, I've not been able to follow links from Firefox to Zoom (zoommtg links don't open the app). However, they still work from Epiphany.

The slight confounding factor is that I realised that I've been updated to FF 104 overnight, so that might be an issue.

I've been looking at network.protocol-handler.... settings in about:config, based on this article: https://superuser.com/questions/1343020/how-to-configure-firefox-open-zoom-urls-using-zoom-application#1351073

I've also been looking at xdg-settings (based on this article) https://www.reddit.com/r/kde/comments/i83m8i/zoom_desktop_client_isnt_launching_from_browser/ which suggests the problems might be to do with xdg-settings calling /usr/share/applications/zoom.desktop when the available file is /usr/share/applications/Zoom.desktop However, I have not been able to alter the xdg-settings parameter - when I try: $ xdg-settings set default-url-scheme-handler zoommtg zoom.desktop it does not change the setting - it remains as Zoom.desktop

I should mention that the version of FF I'm running is delivered as a snap - but this was not a problem before 104 / my latest Zoom installation. Also, this version of FF has no problem opening up MS Teams meetings or Slack groups. handlers.json includes : ... "slack":{"action":4},"snap":{"action":4},"zoommtg":{"action":4},"msteams":{"action":4}}, .... so I am thinking the problem must lie somewhee else.

Any suggestions would be gratefully received.

thanks Andy

Asked by Andy Dearden 1 year ago

Last reply by jscher2000 - Support Volunteer 1 year ago

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Firefox ESR 91.12

Hello, Qualys is detecting Vulnerabilites on our Firefox ESR 91.12 Versions which were patched by MFSA2022-29. It is showing Vulnerabilities because MFSA2022-30 lists CV… (read more)

Hello, Qualys is detecting Vulnerabilites on our Firefox ESR 91.12 Versions which were patched by MFSA2022-29.

It is showing Vulnerabilities because MFSA2022-30 lists CVE's for ESR 102.X and we are on 91.12.

Is there anywhere I can go to get a list of all Vulnerabilities on 91.X to show our Security team, I believe CVE-2022-36314 and CVE-2022-2505 are not present in 91.12 because they are not listed in https://www.mozilla.org/en-US/security/advisories/mfsa2022-29/ but need evidence

Thank You,

Asked by mriley1 1 year ago

Answered by Mike Kaply 1 year ago

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Edit Firefox Dictionary

Accidentally added a misspelling to the Firefox dictionary. Thought it would be easy to locate and edit the dictionary. Enabled 'show hidden files.' On XYplorer, and … (read more)

Accidentally added a misspelling to the Firefox dictionary. Thought it would be easy to locate and edit the dictionary.

Enabled 'show hidden files.'

On XYplorer, and Windows File Explorer can find not a single trace of 'persdict.dat' in my profiles folder.

It would be really helpful if you could advise what the next step would be. Thanks.

Asked by sra97 1 year ago

Last reply by sra97 1 year ago

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Update and reinstall of 105.0.0 FAIL miserably

Went to update to 105.0.1 on a windows 8.1 machine. Update failed, removed previous version and now will not even reinstall running the installer. Installer returns setup… (read more)

Went to update to 105.0.1 on a windows 8.1 machine. Update failed, removed previous version and now will not even reinstall running the installer. Installer returns setup.exe Application error. unable to start correctly.

Asked by j.r.andresen 1 year ago

Last reply by j.r.andresen 1 year ago

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Firefox Keeps Crashing After Update To Version 100

Ever since Firefox updated to the new version I've been having constant crashes. I've tried restarting in Safe Mood which doesn't help. Pretty much Firefox will open, say… (read more)

Ever since Firefox updated to the new version I've been having constant crashes. I've tried restarting in Safe Mood which doesn't help. Pretty much Firefox will open, say it's not responding, and then by the time it looks like it's about to restore my tabs it crashes. I had to do a refresh and transferred the backup files from an older session which worked, but then it eventually crashed again. I uninstalled and reinstalled Firefox and tried opening my older profile but it keeps happening. I really need to restore my previous session. There's nothing with my computer that seems to be causing it. I did have 2 windows open with about 8,000 tabs total which I'm sure could be part of the reason, but it never really had trouble before and only just started crashing since the update. Is there any way to fix this without starting over? I read that this is a bug that others have dealt with previously.

Some additional information. I'm on a 64-bit Windows 10 PC.

Startup Crash False Process Type parent MOZ_CRASH Reason (Sanitized) Failed to load critical module "resource://gre/modules/WebNavigation.jsm" Crash Reason EXCEPTION_BREAKPOINT Crash Address 0x00007ffb8c0f5135

Asked by TMan11 2 years ago

Last reply by Stephen5000 1 year ago

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Can no longer play media with Firefox ESR 102.x

Hello, ever since we moved endpoints from Firefox ESR 91.13 to 102.3, it has become impossible to play any media with Firefox. No video will play in youtube, for instanc… (read more)

Hello, ever since we moved endpoints from Firefox ESR 91.13 to 102.3, it has become impossible to play any media with Firefox.

No video will play in youtube, for instance (it just loads endlessly as if it would start, but it doesn't).

Can't use radio websites either. Anything with a "play" button (video or sound) does nothing.

This has been tested with a clean profile, a clean install, after allowing autoplay in the settings.

Is there any info on what exactly changed between ESR 91 and 102 that might explain this ? There has been no system change, If I reinstall 91 instead it works again as usual.

No issues anywhere else on the endpoints (Edge, Windows), this is on Windows 10 if it makes any difference.

Tanks for any help on this.

Asked by OdeonFF 1 year ago

Answered by OdeonFF 1 year ago

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Firefox doesn't remember username, but remembers password

On this site: https://www.orange.pl/twojekonto/zaloguj I can't force firefox to remember username (no problem with remembering password on next step). In older Firefox wi… (read more)

On this site: https://www.orange.pl/twojekonto/zaloguj I can't force firefox to remember username (no problem with remembering password on next step). In older Firefox without WebEx there was addon which allowed to manipulate forms to prepare proper autocompletion data. This addon is not supported with WebEx anymore due to lack of proper functions. Instead Firefox Dev Team claims that mechanism built in current Firefox is enough for such tasks and mentioned addons are not needed. Seems it is wrong thinking.

I tried different approaches to save username for mentioned site but without success.

Asked by zygdresze1 2 years ago

Answered by cor-el 2 years ago

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Firefox 111.0 freezes on start up

I just updated to FF 111.0. After restarting FF comes up but then nothing. After a bit of I got the option to force close it. I tried opening a Private Browser and that w… (read more)

I just updated to FF 111.0. After restarting FF comes up but then nothing. After a bit of I got the option to force close it. I tried opening a Private Browser and that worked fine so I figured it was one of my add-ons. However after closing the Private Browser and trying opening normally again it worked just fine. Disable all of my add-ons and for the same issue.

Renamed my AppData/Roaming/Mozilla folder and starting as normal worked fine. What a giant pain in the <bleep> trying to set everything back up.

Performed some more science and noticed this. After setting my Mozilla folder back, starting FF, and looking at the TaskManager, There would be 3 processes, one of those after a bit of time would show in red as Not Responding (or words to that effect). Clicking the window a few times to get the force close dialog again. Trying to open FF again, it opened just fine.

So I'm tempted to blame something in the update that is causing this. Yes, I could just start with a fresh Mozilla folder and reinstall all of my add-ons and blah blah blah, but whose to say that after setting everything back up the way I had it the problem won't come back.

I have thought about rolling back to FF 110.0.1, and suppressing the update check.

OS: Windows 10 64-bit Firefox: 111.0 64-bit

Asked by wolf68k 1 year ago

Last reply by wolf68k 1 year ago

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High CPU usage while typing in URL (address) bar

Hello. Typing anything in URL (address) bar causes my CPU spike to 15-20% shown in Windows Task Manager, and up to 80% shown in Firefox Task Manager. I have 8 core / 16 … (read more)

Hello.

Typing anything in URL (address) bar causes my CPU spike to 15-20% shown in Windows Task Manager, and up to 80% shown in Firefox Task Manager. I have 8 core / 16 threads CPU running at 4.0 GHz, so typing text in browser taking 15-20% of that is rather bizarre to me. OS: Windows 10 What I tried: - disabling Firefox Accessibility Service - hardware acceleration on/off - troubleshooting mode

Don't have same issue in other browsers (Chrome, Opera) Any ideas what else that might be?

Asked by FF_Gnome 1 year ago

Last reply by FF_Gnome 1 year ago

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Cannot install add-ons error: "Add-on could not be installed because Firefox could not modify the needed file"

I've run into a troublesome error with Firefox for probably eight months now, so I have not been using the browser. Whenever I attempt to install ANY add-on from the Fire… (read more)

I've run into a troublesome error with Firefox for probably eight months now, so I have not been using the browser. Whenever I attempt to install ANY add-on from the Firefox add-ons page, I get the message "[Add-on name] could not be installed because Firefox could not modify the needed file". Furthermore, attempting to download the add-on file manually (should it be available on a github page or the like) leads to the same message or a notification that the download failed.

As a matter of fact, downloading almost any kind of file on Firefox inevitably fails. The exact notification is shown in the upper-right corner of the browser window, where downloads are shown, and beneath the file in question is an indicator that says "Failed". Everything from .png to .zip to .exe appears in the downloads queue for a second, then fails.

I have tried every solution the Firefox add-on troubleshooting page has suggested, including solutions suggested in other threads, such as deleting/creating new profiles. I have also attempted to completely reinstall Firefox on multiple occasions, as well as the refresh Firefox option.

To recount, the following troubleshoot solutions did not work:

--Everything on the Firefox add-on troubleshooting page --Restart Firefox --Refresh Firefox --Create new Firefox profile and attempt to install add-ons from there --Delete and renew the extensions* files from the profile root folder --Modifying the xpinstall.signatures.required in about:config (true or false, doesn't matter) --Modifying the extensions.alwaysUnpack in about:config (again, true or false, doesn't matter) --Double-checking allow list and permissions on local firewall and antivirus software (the app is protected, add-ons are allowed) --Disabling antivirus software --Running Firefox as Administrator --Reinstall Firefox --Restarting PC

If I want to download a file or add an extension, I need to switch to a different browser such as a chromium-based one or Microsoft Edge to download the file. In the case of add-ons, I switch browsers, download the file, and select the "install add-on from file" option under "manage extensions" in about:addons.

One final thing. It seems that sometimes streaming sites won't work on Firefox (even with ad-blocker disabled or the site allowed through the ad-blocker), and sometimes video won't properly load either. These things work fine on other browsers.

I really like Firefox as a browser and enjoy the privacy it provides built-in. I didn't have any of these issues up until last year and I was forced to switch over. I would really appreciate any help with this.

Asked by BecauseLogic 1 year ago

Last reply by BecauseLogic 1 year ago

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Blocking of Dragon Professional Web Extension

Today, my daughter received a notification that the Dragon Professional Web Extension has been disabled (see attached image). This was done because the extension supposed… (read more)

Today, my daughter received a notification that the Dragon Professional Web Extension has been disabled (see attached image). This was done because the extension supposedly executes remote code and collects user data.

My daughter, a mathematics professor, has very limited use of her hands. She is dependent upon Dragon to do her job. This is not something she just likes - she has a disability and she NEEDS it. Disabling this extension will make her job significantly more difficult, and there are capabilities that the extension provides that she may not be able to duplicate with workarounds.

PLEASE, make the extension useable again. This is an accessibility issue for disabled people - it's not just a fun addition to the browser. If necessary, add some sort of acknowledgement checkbox so that she can acknowledge that she is taking some risks in using it.

One other thing. Disabling this extension with no advance warning was a disservice to all disabled people who depend on it. Had this occurred in the middle of a semester, the effect could have been catastrophic. As it is, she may need to spend the rest of the summer trying to figure out how to do her job without it. You have really, really done an extreme disservice here.

Asked by jkrm 1 year ago

Answered by TyDraniu 1 year ago

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Block on certain websites

I can't access certain websites when I attempt to leave feedback. I'm told to remove blocking. I clicked on the shield and turned off Enhanced Tracking Protection on th… (read more)

I can't access certain websites when I attempt to leave feedback. I'm told to remove blocking. I clicked on the shield and turned off Enhanced Tracking Protection on those sites. I also added the sites to the Exceptions list in Privacy & Security (Manage Exceptions). My Browser Privacy Settings are: Custom Choose which trackers and scripts to block. ✓Cookies: Cross-site Tracking Cookies ✓Tracking content: Only in Private Windows ✓Cryptominers ✓Fingerprinters

But I still can't access the sites.

Which settings do I need to change so I don't get blocked by the websites?

Asked by Denise 2 years ago

Last reply by Denise 2 years ago

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lost everything with firefox

my pc had friend so when i got a new one i lost all of my firefox data, how can i get all of it back so i was forced to start all over, i lost all my, bookmarks, tabs, hi… (read more)

my pc had friend so when i got a new one i lost all of my firefox data, how can i get all of it back so i was forced to start all over, i lost all my, bookmarks, tabs, history and saved passwords

Asked by dj_dean 2 years ago

Last reply by FredMcD 2 years ago

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firefox is not normal wants me to download the browser i have an acct for long time had a virus last night but windows defender caught it and removed it my colors are all gone too along with file view etc on top line

im afraid to download anything. i should not have to download firefox browser, i have been using this acct for years. i tried to update ccleaner last nite and windows def… (read more)

im afraid to download anything. i should not have to download firefox browser, i have been using this acct for years. i tried to update ccleaner last nite and windows defender caught a trojan but removed it right away all other places i have been were fine today what happened to my firefox and duckduck go etc

Asked by memok 2 years ago

Last reply by FredMcD 2 years ago

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websites

Hi and thanks for your good app The following website is not loaded in the Mozilla version, but it is easily loaded in EDGE How can I open this site with Mozilla? website… (read more)

Hi and thanks for your good app The following website is not loaded in the Mozilla version, but it is easily loaded in EDGE How can I open this site with Mozilla? website : https://app.setareyek.ir/

Asked by mpf.s5660 2 years ago

Last reply by mpf.s5660 2 years ago

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Website malfunction

While using Yahoo email I tried to access the 'Notepad' page and get a message saying to Download a new version of Firefox to see the 'Calendar' even though I was trying … (read more)

While using Yahoo email I tried to access the 'Notepad' page and get a message saying to Download a new version of Firefox to see the 'Calendar' even though I was trying for the 'Notepad' not the 'Calendar'. If I try for the 'Calendar' I initially get the small right-sidebar version fine but if I ask for the full page version I get the error message again. This does not happen if I access Yahoo through Chrome-browser. I have repeatedly done the download to no avail. (I have version 99.0.1). I am attaching a screenshot of the error message. Thanks for any help. No rush.

Asked by davidNwillems 2 years ago

Last reply by cor-el 2 years ago

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never sent email with code to authorise login to my account after samsung copied all data to new phone.

I used Samsung smart switch to transfer data to new phone. When I tried to sync Firefox on new phone with my PC, old phone and tablet I was asked to type in the authorisa… (read more)

I used Samsung smart switch to transfer data to new phone. When I tried to sync Firefox on new phone with my PC, old phone and tablet I was asked to type in the authorisation code. No matter how I have set my e-mail accounts no e-mail is received in my spam folder or in-box. There is no way to contact Mozilla to resolve this. I have not received any e-mail to state that my sign in was blocked for security reasons nor have I received an error code. I setup a bugzilla account and tried to request that my account be unlocked but there was no way to do this. All it has done is to create an entry that I reported "Zarro Boogs found". How do I get my account unblocked as the advice on the help pages is no advice.

[Personal information removed by moderator. Please read Mozilla Support rules and guidelines, thanks.]

Asked by robert148 2 years ago

Last reply by robert148 2 years ago