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'No video with supported format and MIME type found' 2023

This issue has plagued me ever since I switched for Firefox. I have NEVER encountered this issue with any other browser. Once every week or two I will encounter a page wi… (read more)

This issue has plagued me ever since I switched for Firefox. I have NEVER encountered this issue with any other browser. Once every week or two I will encounter a page with an MP3/MP4 file and will be presented with this error. I have already tried clearing cache, disabling addons, reloading, etc, but I guarantee the "best answer" will just be some rehashing of these steps. Something is fundamentally broken with this browser, and there are hundreds of people across various sites reporting it. Fix it.

Asked by samg381 4 months ago

Last reply by zeroknight 4 months ago

  • Archived

print orientation

After updating to 114.0.1 the print orientation for pdf's has disappeared. PDF's we used to print often now come out with the wrong orientation and have to be printed wit… (read more)

After updating to 114.0.1 the print orientation for pdf's has disappeared. PDF's we used to print often now come out with the wrong orientation and have to be printed with the system dialog instead.

Asked by snides777 11 months ago

Last reply by jdp68 11 months ago

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Arlo security cameras and HEVC codec

I am using Arlo security cameras which store the video captures as MP4 files. The Arlo app has video playback feature that works in Chrome or Edge but does not work in Fi… (read more)

I am using Arlo security cameras which store the video captures as MP4 files. The Arlo app has video playback feature that works in Chrome or Edge but does not work in FireFox. From what I have been abe to glean from searches, Arlo uses HEVC Codec that FireFox either isn't compatible with or is lacking the codec. Any suggestions?

Asked by tstr14 11 months ago

Last reply by cor-el 7 months ago

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userChrome.css — I've blundered!

See reddit post— no way I'm typing all that again! Reddit Post It's not that long, trust me— it's just that the code is long... I've attached a slightly different scree… (read more)

See reddit post— no way I'm typing all that again! Reddit Post It's not that long, trust me— it's just that the code is long... I've attached a slightly different screenshot to the one I posted on the reddit post, but it makes no difference if you see one or the other, or both!

In summary, I've added a css code to my userChrome.css thingy to move the tabs below the search bar. I was also wondering what the best way to transfer my userChrome.css file + about:config settings over to a new version of Firefox. Due to not being admin of my laptop (I'm running it out of the .dmg file— besides, I always like to keep an older version of Firefox as a fallback), I have to install a whole new version of Firefox onto my laptop to update.

Thanks!

Asked by ctan24 7 months ago

Last reply by cor-el 7 months ago

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Lost tabs

I opened up my browser and all my active tabs which I have had for months are gone. I tried to go to recently closed tabs in history and it doesn't allow me to open. All … (read more)

I opened up my browser and all my active tabs which I have had for months are gone. I tried to go to recently closed tabs in history and it doesn't allow me to open. All are not available. Help!!

Asked by ariosduke19 11 months ago

Last reply by leemjcee 8 months ago

  • Archived

Google won't let me log in to my Google account when using Firefox.

I'm running Mac OS 12.6.6 and Firefox 114.0.1. When I try to log into my Google account, I get the message, "This browser or app may not be secure." I'm running the curre… (read more)

I'm running Mac OS 12.6.6 and Firefox 114.0.1. When I try to log into my Google account, I get the message, "This browser or app may not be secure." I'm running the current version. Javascript is enabled. I've cleared my caches and data. I can log in to Google on other browsers, such as Safari. • This happened after I set up my browser to use Bing Chat, which required that I clear my cache and data.

Asked by robert.rubin 11 months ago

Last reply by sedstrom79 9 months ago

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Yahoo websites blocked from within the US

Yahoo websites blocked from within the US. I get the following message: "When trying to access my yahoo mail account from within the US I get the following message: Yah… (read more)

Yahoo websites blocked from within the US. I get the following message: "When trying to access my yahoo mail account from within the US I get the following message: Yahoo’s suite of services will no longer be accessible from mainland China." Any thoughts on what is happening and how to correct it? I'm in the US using the Mozilla VPN with a US server location

Asked by Jim 10 months ago

Last reply by jonzn4SUSE 10 months ago

  • Archived

failure to load pages in a timely manner

It seems Firefox is getting worse and worse. I am now back to pages loading very slowly. My IT guys say firefox is [redacted] and go to chrome or something else but i hat… (read more)

It seems Firefox is getting worse and worse. I am now back to pages loading very slowly. My IT guys say firefox is [redacted] and go to chrome or something else but i hate transferring bookmarks. WHY can't you stabilize your [redacted] browser. Yours is the only browser my PC runs into trouble with. Makes me [redacted] furious.

Asked by Leana Alba 10 months ago

Last reply by jonzn4SUSE 10 months ago

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Using Firefox today had trouble with online checking account Submit button grayed out, including trying to get a new Comcast account Continue button was grayed out--I need help to resolve this issue.

Basically in my online banking with chevron to login button is grayed out and won't allow me to login, including comcast account Continue button is grayed out. This is an… (read more)

Basically in my online banking with chevron to login button is grayed out and won't allow me to login, including comcast account Continue button is grayed out. This is an urgent matter because I can't get comcast online application for new account completed.

Asked by mailto159 11 months ago

Last reply by jscher2000 - Support Volunteer 10 months ago

  • Archived

updated FF to 114.0.1 and will not open. Gives error: platform version 114.0.1 is not compatible with min version >= 113.02 max <= 113.02

Tell me how to "re" install my previous version of 113.02 and then fix this bug. Don't know where to get "old" versions to download and will old version just "install" r… (read more)

Tell me how to "re" install my previous version of 113.02 and then fix this bug. Don't know where to get "old" versions to download and will old version just "install" right over the version installed and keep all the bookmarks, etc.?

Asked by donP22 11 months ago

Last reply by jscher2000 - Support Volunteer 10 months ago

  • Archived

When I access a particular website and choose options within that website, the page does not go to the selection until I manually "Refresh" the page by clicking on to the circular arrow symbol.

It may be the website itself, but I need to manually refresh the page when I choose to go to any other option, shown on the page, is chosen. That is, is this a particular… (read more)

It may be the website itself, but I need to manually refresh the page when I choose to go to any other option, shown on the page, is chosen. That is, is this a particular selection in the settings of Firefox?

Asked by josefjv 10 months ago

Last reply by cor-el 10 months ago

  • Archived

import from either safari 10.13 mac os or iphone passwords?

Hi, I exhausted almost every option, but I can't figure out how to import safari 10.13 passwords from mac or from iphone passwords settings section into an export file to… (read more)

Hi, I exhausted almost every option, but I can't figure out how to import safari 10.13 passwords from mac or from iphone passwords settings section into an export file to upload. help????

Asked by Vince 10 months ago

Last reply by Medhasree Suram 10 months ago

  • Archived

open previous tabs

I cant select the open previous tabs cheq box. it doesnt work. Very frustrating! This is after i made firefox the prefered and protected browser. I cant change that it se… (read more)

I cant select the open previous tabs cheq box. it doesnt work. Very frustrating! This is after i made firefox the prefered and protected browser. I cant change that it seems.

Asked by goudgoed 10 months ago

Last reply by jonzn4SUSE 10 months ago

  • Archived

Adobe Express (Beta) version won't run on Firefox browser

First of all, let me just say that I love Firefox and refuse to use any other browsers In my profession, I need to use Adobe products - somehow, the new Adobe Express (b… (read more)

First of all, let me just say that I love Firefox and refuse to use any other browsers

In my profession, I need to use Adobe products - somehow, the new Adobe Express (beta) will not run on Firefox browser, it run with no problems on Microsoft Edge and Chrome.

Do you have any idea what might have cause this issue? I understand that Adobe Express (beta) will go live soon, and it will be terrible that I couldn't continue on Firefox browser, I wonder if you can have Firefox developers take a look and maybe figure out with Adobe?

Thanks for listening and hope that you'll find a solution

Asked by davi 11 months ago

Last reply by PeterBBlaikie 10 months ago

  • Archived

Firefox will not play YouTube videos with Hardware Acceleration

This is a duplicate question because it was not solved the last time, and there were no other replies. 1. Works on all other browsers, but Firefox plays only audio and a… (read more)

This is a duplicate question because it was not solved the last time, and there were no other replies.

1. Works on all other browsers, but Firefox plays only audio and a blurry video (see screenshot). 2. PC is equipped with a beefy i9-13700 and RTX 4080; even with that CPU, disabling hardware acceleration eats up almost 25-30% CPU and it is not practical to watch videos that way. 3. Is this bug really not that common? Is it just me and that's why there's no traction for fixing this bug? 4. How do I elevate this request so someone takes action, in case we find no solution in this thread?

Asked by zaw 11 months ago

Last reply by waheedaman5828 11 months ago

  • Archived

how to prevent disabling an addon

hello firefox heroes, I am looking for a way to prevent disabling an addon. The addon is secondary, but for the sake of completeness: it's about the web blocker LeechBl… (read more)

hello firefox heroes,

I am looking for a way to prevent disabling an addon.

The addon is secondary, but for the sake of completeness: it's about the web blocker LeechBlock.

It was intended as an alternative to the web blocker ColdTurkey, but unlike ColdTurkey, which does not work for Linux systems, there is no password protection to prevent disabling and/or uninstalling the addon. Thus, it is quite easy to get distracted even though you don't really want to.

does anyone know a solution?

Asked by jan.pr 11 months ago

Last reply by cor-el 11 months ago

  • Archived

migrating browser data to new laptop

More than four years ago I created a mozzilla account on my work laptop, in hope of easier migration, syncing between devices, and similar promises. I signed into the acc… (read more)

More than four years ago I created a mozzilla account on my work laptop, in hope of easier migration, syncing between devices, and similar promises. I signed into the account, and have been happily using Firefox ever since, with that 1 time login, thanks for that.

Recently I got a new work laptop and I wanted to use syncing, but I unfortunately had to realise that I do not remember the password I gave 4 years ago (since I was never once prompted to provide it again). So I tried to reset my password. Up until this point I was never warned, that one e-mail account provided would not be enough for password resets.

I tried providing a secondary e-mail address, but that doesn't give me a password reset option. I also tried activating 2fa according to the tutorial, with two different apps (authy and google authenticator) but the browser always says invalid key, so I failed activating 2fa. I tried password reset, but it says I will lose all the data, I would like to sync, so that is not a reasonable option... I tried to manually migrate my profile over to the new laptop, by replacing "Profiles" folder contents on the new laptop, but that just makes Firefox unable to start even.

So I am at my wits end, and begging for help. Looked at reddit posts on how to get browse data to new pc and official support faq-s but I do not see a solution.

I am still signed in, on the old work laptop, that is where I'm writing this plea for help from.

I would really love to recover my account and sync it to the new device.

After typing it out I realize how "social engineeringy/hacky" this message sounds. But I'm willing to prove my identity, by any means necessary, and the account mail address is my name (that is also on my national id card).

Please help me, or advise me how to proceed and reset my password without losing all my data.

yours truly Ferenc Patai

Asked by ferenc.patai 11 months ago

Last reply by cor-el 11 months ago

  • Archived

More and more problems

About 2 or 3 updates ago...after the update I can not clear all my web browsing history. I have my homepage set to Firefox's " about:preferences#privacy " I usually cl… (read more)

About 2 or 3 updates ago...after the update I can not clear all my web browsing history. I have my homepage set to Firefox's " about:preferences#privacy " I usually clear all the ' stored cookies, site data ' through the " Clear Data' button. Have it set to clear ALL data. Also clear " History " data and too ALL data.

Then I use " CCleaner " to clear any data that might have been left on my PC. 
It/CCleaner too has settings to clean Firefox's Cache, history, cookies, download history, session and more which use to work very well on clearing all data of web browsing.   That doesn't do it anymore. 
 After all the effort I go through after closing Firefox to delete/eliminate all my browsing history... through the manual tic-buttons IN Firefox... AND with the settings to clear cookies, site data and history upon closing.  PLUS using CCleaner.  
I ALSO close down/disable my 'Wireless Network' modem EVERY TIME I close Firefox  because I've had programs... AV program... that had stupid-non-disabling auto update that would connect... on it's own... to the net and not only check for it's update but downloads updates on every program update-able.
 But with all the work and precautions....
NOW when I click on Firefox to start a whole new session... remember all the moves I take AFTER the last session... It/Firefox asks if I want to continue with my last session and shows the sites I was at the last time.
If there is anyway to get... MY PRIVACY BACK!!! ... I would LOVE to hear about it.
I would LOVE to have my "Firefox 2.0. " back where/when there were no problems.

Asked by ynot_jd 11 months ago

Last reply by Mich 11 months ago