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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… (læs mere)

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

Stillet af natas.hastings for 1 år siden

Besvaret af jscher2000 - Support Volunteer for 1 år siden

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As soon as a video is played in youtube firefox crashes

The main youtube page loads and displays ok. As soon as a video is played (even in preview), firefox crashes. I'm on Linux Manjaro. other websites with video work fine (f… (læs mere)

The main youtube page loads and displays ok. As soon as a video is played (even in preview), firefox crashes. I'm on Linux Manjaro. other websites with video work fine (for ex Vimeo) I tried disabling all my addons and plugins in the normal mode (not troubleshoot mode) and it still crashes. However, the troubleshoot mode works fine ! Refreshing firefox didn't fix the issue. I have another computer with Linux manjaro and firefox works just fine. I spent a lot of time trying to understand what's wrong but I really don't see why.

Thanks in advance for your help.

Stillet af gdurrens for 1 år siden

Besvaret af TyDraniu for 1 år siden

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File upload dialog not appearing

I'm running Firefox 99.0.1 on Ubuntu 22.04. Recently (I think since I updated to Ubuntu 22.04 about a week ago), Firefox has been refusing to show me file upload dialogs.… (læs mere)

I'm running Firefox 99.0.1 on Ubuntu 22.04. Recently (I think since I updated to Ubuntu 22.04 about a week ago), Firefox has been refusing to show me file upload dialogs. When I click a button that's supposed to give me one, nothing happens.

This has been happening with: - The "attach files" button in Gmail - A file upload button on Gradescope (website for managing homework assignments) - File -> Open File... and Ctrl+O.

Dragging and dropping a file onto an email in Gmail does attach the file -- it's just that the button doesn't work.

I've tried restarting, and I've tried running Firefox in Troubleshoot Mode -- so far nothing has fixed the problem. What else should I do?

Stillet af allispaul for 1 år siden

Besvaret af jonzn4SUSE for 1 år siden

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Firefox slow to boot [Arch Linux]

Hi, so I recently installed arch Linux and want to use Firefox as my browser. However ever since I installed it, it takes a long time to launch the program. It consistent… (læs mere)

Hi, so I recently installed arch Linux and want to use Firefox as my browser. However ever since I installed it, it takes a long time to launch the program. It consistently takes just over 26 seconds to launch. After it's open everything works fine besides that. Also when I launch Firefox from the terminal I get this message "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. Missing chrome or resource URL: resource://gre/modules/UpdateListener.jsm Missing chrome or resource URL: resource://gre/modules/UpdateListener.sys.mjs" I have been looking at some help threads but I can't make sense of what they are talking about. Hopefully this makes some amount of sense to you.

Stillet af ashley92508 for 1 år siden

Besvaret af ashley92508 for 1 år siden

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Firefox keeps freezing

I was directed here from Mozilla Connect. Since the update a few days ago, my Firefox browser keeps freezing permanently. It seems to happen mostly when I interact with G… (læs mere)

I was directed here from Mozilla Connect. Since the update a few days ago, my Firefox browser keeps freezing permanently. It seems to happen mostly when I interact with Google Search (sometimes just loading Google will cause it) but it does happen occasionally on other sites. When it freezes this way, the only fix is to End Task and reload. It will successfully reload to the state it was in just a few seconds before freezing. I'm on Windows 10. I keep everything (OS, browsers, etc.) up to date, so I doubt that would be a factor. I wonder if there could there be an issue with a Google-based script (hence it occurring on other sites)? I don't know how I'd test for that.

Stillet af Jarieスイセン for 1 år siden

Besvaret af Jarieスイセン for 1 år siden

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I can't save files in Firefox

Firefox worked perfectly, but since a few days I can't download anything. I'm using Mozilla Firefox snap for Ubuntu 22.04, version 110.0.1 (64 bits) canonical-002 - 1.0 W… (læs mere)

Firefox worked perfectly, but since a few days I can't download anything. I'm using Mozilla Firefox snap for Ubuntu 22.04, version 110.0.1 (64 bits) canonical-002 - 1.0 With Chrome everything works perfectly so I assume it's a problem from Firefox.

When I open a PDF, a MP3 or any file, the "save" option doesn't display anything. Usually it opened a dialog where I could choose the folder where I wanted to download the file, but now I have nothing.

I have only 4 extensions: - adblocker ultimate - duckduckgo privacy essentials - vuejs dev tools - zotero connector

I always had them and I never encountered any problem.

Stillet af DJ Caësar 9114 for 1 år siden

Besvaret af DJ Caësar 9114 for 1 år siden

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website will not open

I'M trying to open Realtor.com and I get this message: Application error: a client-side exception has occurred (see the browser console for more information). Can't seem … (læs mere)

I'M trying to open Realtor.com and I get this message: Application error: a client-side exception has occurred (see the browser console for more information). Can't seem to fix it. Can you help?

Stillet af wduerig for 1 år siden

Besvaret af cor-el for 1 år siden

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Video not working for certain sites

I recently got a new computer, and in trying to get all my old accounts and what not synced up, I noticed that Twitter videos weren't playing for me and giving me a gener… (læs mere)

I recently got a new computer, and in trying to get all my old accounts and what not synced up, I noticed that Twitter videos weren't playing for me and giving me a generic "The video could not be played", which was odd and annoying, but not the end of the world. I then went over to Twitch and got the "Your browser encountered an error while decoding the video. (Error #3000)". Meanwhile, Youtube works perfectly fine.

I tried clearing cache/cookies, tried on incognito mode in case it was an issue with one of my extensions, all to no avail - when I swapped over to Edge just to check if it was a computer issue versus a Firefox issue, both sites functioned in Edge just fine. Is there anything else I can try troubleshooting in Firefox to see what's causing this short of trying to uninstall/reinstall again?

Stillet af lolarayyy for 1 år siden

Besvaret af jscher2000 - Support Volunteer for 1 år siden

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Firefox crashes on using youtube

Hi, my Firefox keeps crashing on using youtube (on openening youtube.com or any site which integrates a youtube video). My crash report ID is as follows: bp-d25e9417-a29a… (læs mere)

Hi, my Firefox keeps crashing on using youtube (on openening youtube.com or any site which integrates a youtube video). My crash report ID is as follows: bp-d25e9417-a29a-4ce2-ac69-1e8460220329 Is there anything I can do? Thx a lot, Maike Scotland

Stillet af maike9283 for 2 år siden

Besvaret af jonzn4SUSE for 2 år siden

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Facebook lagging

So for the last little while, Facebook has been making a complete nuisance of itself on firefox. This isn't a browser problem, because the other tabs I have open work pe… (læs mere)

So for the last little while, Facebook has been making a complete nuisance of itself on firefox. This isn't a browser problem, because the other tabs I have open work perfectly fine, but FB takes forever to load, and any button I press to interact with it, (like the reload button,) also lags, (but, again, works fine on other tabs,). It doesn't even register links as being clickable for a good minute after loading. The page also seems to reset every time I switch from another tab to it, showing a blank page with a loading symbol. I have tried deleting the entire history, and restarting the browser, and deactivating the adblocker, (the only extension active) and nothing seems to help. Does anybody know why it's doing this, (other than because the company follows the 'if it isn't broke, break it' theory, which we all already knew,) and how to fix it?

Stillet af Khat for for 9 måneder siden

Besvaret af Khat for for 9 måneder siden

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FF maintains browser tabs in full screen

on my Win10 64b system the FF browser keeps the tabs visible after the last 99.0.1 update. i didn't make any changes to the browser after that update that i can recall. t… (læs mere)

on my Win10 64b system the FF browser keeps the tabs visible after the last 99.0.1 update. i didn't make any changes to the browser after that update that i can recall. thx!

Stillet af Mataichi for 1 år siden

Besvaret af YongHan for 1 år siden

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Cloudflare Problems...again

Just recently, I've been having problems with websites run by Cloudflare. Whenever I attempt to access ANY website that is operated by Cloudflare, I'm often presented wit… (læs mere)

Just recently, I've been having problems with websites run by Cloudflare. Whenever I attempt to access ANY website that is operated by Cloudflare, I'm often presented with a blank page, or a Firefox error message. Sometimes I'm even presented with the DDoS protection error, even though my computer is clean having being scanned by Kaspersky and Malware Bytes.

I reiterate this and say that it's only Cloudflare sites that are causing problems. Very occasionally they will work for up to an hour or so but most of the time it is error messages or blank pages. Interestingly, other web servers such as Amazon, OVH SAS and Akamai all run with no problems so I wonder what is Cloudflare's problem? Is this something to do with my browser or the web hosting services?

Stillet af 小白龙1313 for 1 år siden

Besvaret af 小白龙1313 for 1 år siden

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"NetworkError when attempting to fetch resource." on many websites

in the last day firefox has all but stopped working on most websites. i can go to them and they start to load, but then they eventually break halfway through and either e… (læs mere)

in the last day firefox has all but stopped working on most websites. i can go to them and they start to load, but then they eventually break halfway through and either end up loading forever or produce an error. if i look at the console i see "Source map error: Error: NetworkError when attempting to fetch resource." this happens on twitter.com and raidbots.com to name two off the top of my head.

i did a complete refresh and even completely uninstalled and reinstalled the browser - it started working for a bit and then broke again. i have no plugins or extensions enabled currently (i have dashlane but this happens with it enabled or disabled). it's making the browser unusable. ive scanned my computer for malware and cant find anything either. i don't have this problem in any other browsers so not sure what else to try.

Stillet af fnnmyr for for 11 måneder siden

Besvaret af cor-el for for 11 måneder siden

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No Audio from Firfox. Not in Windows volume mixer

After start up Firefox I am not getting any audio. No other app nor browser has this issue. It does not show up in the volume mixer. I've made sure all apps, browser, dri… (læs mere)

After start up Firefox I am not getting any audio. No other app nor browser has this issue. It does not show up in the volume mixer. I've made sure all apps, browser, drivers, and windows are up to date.

Stillet af birdville3000 for 1 år siden

Besvaret af birdville3000 for 1 år siden

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Print <ctrl-P>... Preparing Preview hangs

I'm running v100.0.1 (64-bit) on Win10. I've seen others report this problem but haven't found a fix listed anywhere. <Ctrl-P> or Menu->Print results in the sa… (læs mere)

I'm running v100.0.1 (64-bit) on Win10. I've seen others report this problem but haven't found a fix listed anywhere. <Ctrl-P> or Menu->Print results in the same problem. The print overlay starts up (say Print in top right corner), spinning wheel above Preparing Preview in the center of the overlay... Never ends. I have to Esc to get out of it. Happens on any page. Print dialogue works fine on same pages with Chrome and Edge.

Stillet af Bryan for 1 år siden

Besvaret af Bryan for 1 år siden

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"This file contains a virus or malware." download popup won't go away

Firefox version: 102.0 (64-bit) System: Windows 10 21H2 I recently downloaded a file that may have had some sort of virus or malware. The file came up negative in Window… (læs mere)

Firefox version: 102.0 (64-bit) System: Windows 10 21H2

I recently downloaded a file that may have had some sort of virus or malware. The file came up negative in Windows Defender and Malwarebytes but I deleted it anyways; however, I still get a download popup every time I open Firefox telling me that "This file contains a virus or malware." I've cleared the download library and browser history (cookies, cache, etc.) but I still get the popup from the Firefox.

Is there any known fix for this? Thanks!

Stillet af Pat H for 1 år siden

Besvaret af Pat H for 1 år siden

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Multiple settings are greyed out

Hi, I'm having a problem with my Firefox where it doesn't let me change some of my settings. This is my home PC and I've already tried running Firefox as admin and the se… (læs mere)

Hi, I'm having a problem with my Firefox where it doesn't let me change some of my settings. This is my home PC and I've already tried running Firefox as admin and the settings are still locked. I have reset it many times and haven't installed any extensions. I can't find anything online about this.

Stillet af enziqo for 1 år siden

Besvaret af enziqo for 1 år siden

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Some video content can not be displayed.

I use a laptop with Fedora 36 installed. Firefox is version 104.0.1 Until a few days ago, there were no problems with video display. But since a few days, video content … (læs mere)

I use a laptop with Fedora 36 installed. Firefox is version 104.0.1

Until a few days ago, there were no problems with video display. But since a few days, video content that is offered by the news site from NOS (Dutch television) is not displayed anymore. I only get this error: The media playback was aborted due to a corruption problem or because the media used features your browser did not support.

Also some content on Youtube aborts. For example loading https://www.youtube.com/watch?v=qq0BUiEs3JM results in this error: Er is een fout opgetreden. Probeer het later opnieuw. (Afspeel-ID: Ui0fzPxdSexgYcZ4).' (An error occured, try later again).

When using the Chrome Browser both websites can be used without giving errors implying that all the codecs are available.

How can I detect why video is blocked?

(Twitter also gives problems. After a fraction of a second, it stops displaying video)

Stillet af Ben Engbers for 1 år siden

Besvaret af Ben Engbers for 1 år siden

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Firefox hangs on google search V 100.0

When using built in search (google default) -- browser stops responding. Shows Firefox new tab background when loading the search. Issue resolves on Firefox close and re-… (læs mere)

When using built in search (google default) -- browser stops responding. Shows Firefox new tab background when loading the search. Issue resolves on Firefox close and re-open. Paste and go, creating new tabs also fail with same 'new tab background' displayed. Issue is intermittent but appears often, at least 4-5 times a day.

Tested same sample search with google chrome in same time period, no issue.

Issue appeared around the V99 update. Fix would be greatly appreciated - exiting and re-opening browser, dropping all tabs to reload is a serious usability issue.

Stillet af dan.baldewicz for 1 år siden

Besvaret af cor-el for 1 år siden

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Uploading photos to Meetup

This sounds like it's a Meetup problem, and in fact it may be, but now I am having doubts. The problem is that I can't upload photos to a Meetup event. (This will most… (læs mere)

This sounds like it's a Meetup problem, and in fact it may be, but now I am having doubts.

The problem is that I can't upload photos to a Meetup event. (This will mostly just be a problem for Meetup organizers.) When I click on "Save photo", nothing happens. No error message, nothing. It's as if the "Save Photo" button has been disabled. Firefox is my browser while I access Meetup.com, and I have the latest and greatest version of Firefox.

I contacted Meetup and they haven't been able to solve the problem; they suggested that I clear my cache and my cookies and try again, but I get the same result. HOWEVER, when I go into Microsoft Edge, I can upload photos with no problem. So I have a work-around: use Microsoft Edge to upload photos. So my question to you centers around: why does this work perfectly in Microsoft Edge, but it doesn't in the latest version of Firefox?

To test the possibility that it's a bug on my personal desktop computer, I went to the public library and tried the same experiment, with the same result. So I don't think it's problem with my personal desktop computer.

One other piece of information: the exact same thing happens (failure to update photo, that is) when I have the photo open in another application (Photoshop), even if I try to "save photo" to Meetup in Microsoft Edge. Then when I close the other application (Photoshop in this case), Microsoft Edge lets me "save photo."

I know that Firefox really doesn't want me to try to revert to a previous version, and it makes me nervous too, but I am suspecting that something in the latest Firefox version actually introduced a problem. (Or maybe triggered a Meetup bug of some sort; I still haven't located the problem.) I've been on Meetup.com for years, I've had Firefox for years, they've worked together to upload photos in the past for years.

If you want to get into the details, below, for what it is worth, is my initial question to the Meetup support people (with whom I am still in a conversation).

- - - - - - - -

I can't upload a photo for my event. In fact, I cannot upload a photo for any event at all. I deleted a couple of photos and an album because maybe our group had too many, but that didn't work. I can't even upload a photo that I had previously uploaded to a different event, so I don't think that the problem is with the photo itself.

Here's what happens. 1. Edit the draft of my meetup. 2. Click on "upload photo." The photo is 1827 x 1009 pixels, total size 63 KB. 3. I click on "Upload photo", then in "add photo" I click on "upload photo" again. I browse for the photo and select it. 4. The "crop your photo" screen appears, with the selected photo in it. It's already the size I want, so I click on "Save Photo".(Cropping doesn't help either.) 5. Nothing happens. No error message, nothing. The only think I can click on is "cancel," which takes me out to the previous screen. - - - - - -

Stillet af keith54 for 1 år siden

Besvaret af bonzcrystall for 1 år siden