Firefox Support Forum

Hello, can you add better support playback on .mp4 videos? Seems with Firefox it's a hit-and-miss with some .mp4 videos that will play and some that will just show "No video with supported format and MIME type found".

All other browsers will play .mp4 videos without an issue but Firefox won't.

If you can provide better .mp4 playback support that would be greatly appreciated. Thanks

Here's one of those videos for an example: https://drive.google.com/drive/folders/1Fv6SdftiCXeYPQOdF17H2JNpwjMu9P7q

Pretty much a URL string like example.com/videosample.mp4

I can no longer request further information on sites where it is possible to click and the result will be displayed. For example: I read a national newspaper on-line. After reading the article I then have the option of reading subscriber comments. When the button is pressed page says it is loading - but nothing happens. If I then switch to Edge - no problem. So I guess the problem does not lay with the newspaper. Many thanks for your help.

Oddball minor problem I've encountered on a recent update of Firefox, but also I switched keyboards at the same time, so I'm not sure which causing the problem. I'm on a PC, using an MSI keyboard. Ctrl and Shift keys all work, the ONLY combination that doesn't work is (left) Ctrl + (left)Shift + P. Other Ctrl + Shift key combinations work. If I hold the right Ctrl and either shift, P works fine. If I hold the right Ctrl and the right Shift, P works fine. (left) Ctrl + (left)Shift + any other key shortcut in Firefox or elsewhere works, it's ONLY the P shortcut and only in Firefox and only with the left two ctrl+shift combo that doesn't work.

Any ideas on what is causing this and how to fix it?

I was recently on Reddit and when I went to post a comment I noticed that it went to a user name called Far_Sheepherder_104 ,but they were using my email address , it also showed me that the account was using a Galaxy s20 & I don't have that type of phone and I never have had an s20. Can you please advise me on what I need to do.

Whenever I open Firefox on Chrome OS, which I installed via the Linux shell terminal, it says in settings that the browser is managed by my organization. However, I don't have a school account signed in or anything.

I have Firefox set to ask me where to download files that I want to download. It works for normal download links, but when I'm using my credit card company site's PDF viewer to look at a statement and I click on the download icon or link in the upper-left, it simply downloads the PDF (to my chosen "Save files to" folder in Settings). Is there a current way to change this behavior? Is this something that the website's code determines, overriding my Firefox setting?

This happens with multiple sites, so it is a Firefox BUG issue.

1. 1 - When I go to login at "office.com/setup" I try to set up a new account because I don't recall my login.
2. 2 - I type in my login name, example: "email@domain.com"
3. 3 - Surprisingly it says choose another email, that one is in use.
4. 4 - SO, I go back out and try again only THIS time I try logging in with my email because it is ME, not a new person
5. 5 - Then it sends me to a NEW window to change my pwd.

I enter NEW pwd twice. It sends me back to the login page, I enter my new info and it sends me back to enter my NEWER password twice again. I fall for it and enter ANOTHER NEW PWD.

1. 6 - It sends me back out to login AGAIN, then it asks me to enter my NEW password twice again.
2. 7 - repeat #6 indefinitely

This has happened to me at my bank and Microsoft office download. These two companies are NOT related. But I am using Firefox both times. SUGGESTIONS??? My bank locked me out for too many attempts to get in. On and ON and ON and ON.

Similar issue to the other posters. Firefox doesn't support streaming from amazon, netflix, or disney+. I have windows 10, a PC, an updated version of the browser, DRM content is allowed, and my widevine plugin has been updated as of today (12/10/23). Disabling all of my extensions did nothing to help. I can stream on apps and other browsers. Please work on a fix soon, or let us know what to do. Thanks.

And, apparently not even on this site (see "feilds" above)!

I have tried troubleshooting mode and a clean profile with no addons.

At least on YouTube, I've noticed this issue for several months.

Why am I seeing pop-up windows with ads for this online women's cloting store: https://www.lightinthebox.com

I have Firefox open. When I click on a link in Thunderbird instead of opening the page in the open Firefox window, it opens a second Firefox window? This just started happening and I don't know what I might have done to cause it. Using Windows 8.1.

New window opens in maximized but new private window doesn't, turning on and off privacy.resistFingerprinting in about:config solves the problem but for unknown reasons it happens again.

Sometimes in the background firefox will start to max out my ram usage (32GB). I am not sure if it is a addon or a site which is doing this. I captured a memory measurement, but not sure what to make of it. I don't have anything to add up parts or anything.

What is weird, is when I go back to firefox and tab through my tabs it will go back down to a reasonable level.

https://drive.google.com/file/d/1VHgEqVGBasSiypTj_iiiKvhUAq_thlKn/view?usp=drive_link

Video on https://www.abbeyroad.com/Crossing is suddenly unable to be played after to last Firefox update!! This has happened several times in the past but after 2 or 3 days it suddenly will start working again!!! It's been over a week this time and no resolution yet! Note following LARGE ROTATING X is: "The media could not be loaded, either because the server or network failed or because the format is not supported." Same note as in the past but eventually disappears and video works just fine. The video is a live shot of the Abbey Studio's Crosswalk (ie, the one shown on the cover of a Beetles Album years ago).

Hi

since the last update of firefox my e mail (hot mail) attachments will not print. When print is selected the only option is to print to pdf. tried in another browser and printing works perfectly. Printing worked with no problems before last update. Help Please Please note I am a very basic user so need step by step instructions. Hoping someone can help PLEASE!

I've used Google as my preferred search engine since Google became available...

Now, I get asked repeatedly if I want to sign in to my Google account, too many Sponsored websites, location location location, and type in once, my search results need streamlined, but I cant see what I wrote the first time!

Don't waste my time please with a technical response asking me did I control + alt+ no I didn't I don't operate like that.

Give e a simple fix... I'm growing tired of the constant updates to Fire Fox... never had these issue when the browser came out... supposedly a more user friendly private browser.

THX

You somehow have old, outdated information in your system. Your new browser requires me to log into a facebook account I closed 10 years ago. My password for my current account named, "VangiePangie", now opens a closed account named "Evangeline Custis". I no longer have access to my VangiePangie account with any password. So, I no longer want this new upgraded Firefox account. I want to have my old Firefox account as a default on my desktop. Right now it's an icon at the bottom of the screen, and I can only use it to open one thing at a time. Please give me back my old Firefox browser. I'll struggle with Facebook to get my password to work on my VangiePangie account. I have access to the VangiePangie account right now, because it was never logged out in my old Firefox browser and is in my Bookmarks. But if I am forced to log out, or if Facebook does a security check, I won't have access ever again. Please help me with this. Below is my VangiePangie Profile pic.

Why does your Browser use up so much of my CPU & have all these unknown processes going without my knowledge??? It's slowing & unnecessarily overheating my gaming laptop! What can I do 2 kill all ths extra, unwarranted activity of your Browser?!? Plz help!?