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Does Firefox support .mp4 video?

On page https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox?redirectslug=viewing-html5-audio-and-video&redirectlocale=en-US I find "AAC and H.264/MPEG-… (read more)

On page https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox?redirectslug=viewing-html5-audio-and-video&redirectlocale=en-US

I find "AAC and H.264/MPEG-4 AVC are patented audio/video compression formats. They can be viewed in Firefox using built-in OS libraries (so neither Mozilla nor you need to pay a fee) if embedded in the MP4 container format (.mp4, .m4a, .m4p, .m4b, .m4r, .m4v file types)."

But when I create an HTML page with the following HTML5 code:

<!DOCTYPE html>
<html>
<body>
</body>
This is a test of video.
<video src="C:/MyVideoFile.mp4" controls>
</video>
</html>

I get the error "No video with supported format and MIME type found". Does Firefox in fact support .mp4 video? If so, what changes do I need to make in the HTML?

Asked by WoodyFF 1 year ago

Answered by WoodyFF 1 year ago

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Cursor blink problem in Firefox 84

I'm having a new problem with Firefox, which I think appeared with Firefox 84 (but I'm not 100% sure). When I type in some text boxes, the cursor gets very slow and unres… (read more)

I'm having a new problem with Firefox, which I think appeared with Firefox 84 (but I'm not 100% sure). When I type in some text boxes, the cursor gets very slow and unresponsive to move around by the keyboard _if_ the text in the box is long enough so that a scrollbar appears on the right hand side. Sometimes. It doesn't happen at all sites -- it's not duplicating in this textbox that I'm typing in right now -- but it happens all of the time in the message boxes at playdiplomacy.com, and sometimes on GitHub.com when posting issues. Sporadically and unreliably.

As far as I can tell, the cursor is still moving quickly and responsively, but the blink itself isn't happening so I can't see it. If I hold down the left cursor key, it looks like the cursor isn't going anywhere, but if I hit a letter key that letter appears instantly at the location where the cursor has apparently moved to, with no delay.

The problem does not occur when I hold down shift (to highlight) while moving the cursor via the arrow keys, which further suggests that it is somehow related to the cursor blinking.

Restarting in safe mode makes the problem go away instantly. Disabling all add-ons myself does not. Starting with a brand new profile does _not_ make the problem go away either. So there's something safe mode is doing that a new profile doesn't.

Any idea what might be causing this?

(Ubuntu 20.04, Firefox 84.0).

Thanks!

Asked by Vultan 1 year ago

Answered by cor-el 1 year ago

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"Reload page" button has disappeared

After installing Firefox 84.0 (Mac), I no longer see the circular "reload page" tool on the address bar. Is this something I did, or has it really gone away? If it's gone… (read more)

After installing Firefox 84.0 (Mac), I no longer see the circular "reload page" tool on the address bar. Is this something I did, or has it really gone away? If it's gone, how do I force a page reload? If I screwed something up, any idea how I can unscrew it ;) ?

Asked by BSquared 1 year ago

Answered by cor-el 1 year ago

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Website always opens in container, "Reopen in Container" => "No Container" doesn't work

Desktop FireFox browser v. 84.0.2 (64-bit) I made the mistake of asking to always open a site in a container and for it to remember my choice. Now I can't get it to open … (read more)

Desktop FireFox browser v. 84.0.2 (64-bit)

I made the mistake of asking to always open a site in a container and for it to remember my choice. Now I can't get it to open in no container. The context menu choice to "Reopen in Container" => "No Container" seems to ignored.

The issue: I have to different logins for a site (dev.azure.com). I open one in the work container and the other in no container. I didn't realize the open in container would operate only on the domain, which makes sense in hindsight. However, now the site is broken for one of the sites, and I can't find where to reset this choice. How do I do that?

Asked by nancy.folsom 1 year ago

Answered by nancy.folsom 1 year ago

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Wordpress Website not (re-)loading in Firefox

Hi @ all, our website https://ana-dismissed.de/ is not loading in Firefox, or to be more precise it is loading often but on occasionally not reloading when refreshed. Thi… (read more)

Hi @ all,

our website https://ana-dismissed.de/ is not loading in Firefox, or to be more precise it is loading often but on occasionally not reloading when refreshed. This only happens in Firefox, Safari and other Chrome-based Browsers don't show this, perfectly working there (as far as I could check).

I already checked Firefox developer tools, like console or resource loadings etc. There is no issue I can find. I'm completely lost, no hint at all, why this happens in Firefox only.

Please find a short video here: https://imgur.com/a/31XyiMi

I'm thankful for every hint into the right direction.

Best regards!

Asked by admin340 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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ZIP Files Downloading as PDFs

Background: I'm currently tutoring full-time, and the site I use allows tutors to download the session afterward as a .zip folder. In the past this has been incredibly he… (read more)

Background: I'm currently tutoring full-time, and the site I use allows tutors to download the session afterward as a .zip folder. In the past this has been incredibly helpful, because it allows me to review my lessons and improve my planning.

Current Issue: For some reason Firefox now appears to be misinterpreting these ZIP files as PDFs. When I begin the download, Firefox gives me the option to either open (as PDF) in Firefox, or to download. At this point (before any download occurs) Firefox has already labeled the file as a PDF. If I open it in Firefox, obviously it doesn't work (being a .zip folder.) If I download it, Windows Explorer usually lets me explore it as a .zip folder, but recently, about 10% of the files I download (even if I never open them as a PDF) still download as a PDF and are therefore inaccessible.

Fixes: I've tried downloading instead of opening with Firefox. This works about 90-95% of the time; not sure what the issue is. I've tried re-assigning the file type in Windows Explorer, to no avail. I've adjusted Firefox preferences (from "always ask" to "use Windows Explorer.") I'm not sure this will help, but will try.

Any advice? I hate to sound fussy, but I'm pretty meticulous about saving my lessons and hate losing that much data on my students. While I can save each file independently, it takes much longer. Thank you!

Asked by ajic.ajic 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Recovering data

I had to reset my computer and lost my data, unfortunately I did not create a firefox account beforehand. Is it possible to recover that information or is it lost indefi… (read more)

I had to reset my computer and lost my data, unfortunately I did not create a firefox account beforehand. Is it possible to recover that information or is it lost indefinitely. I managed to find some appdata information locally on my computer, but I do not know how to go from there.

Asked by thekim0517 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Firefox Keeps Changing File Extensions for 'Odd' File Type

Like I said in the title, Firefox keeps changing the file extension for 'odd' file type when downloading them. I say 'Odd' because I download this type of file almost eve… (read more)

Like I said in the title, Firefox keeps changing the file extension for 'odd' file type when downloading them. I say 'Odd' because I download this type of file almost every day. They're a .ts4script file type, which is a file type for modding The Sims 4. Up until today they were downloading just fine, but now firefox keeps changing them into .zip files.

While this slightly makes sense as a .ts4script IS a zipped up file that contains python files it's very annoying to have to manually change the file type after downloading more than a few at the same time...

Is there maybe a setting I may have accidentally changed or something?

Asked by dewdrp 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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"simplify page" option missing in print preview

Today, when I go to print out a web page, the format of the Print Preview window has changed and the"Simplify Page" option is missing. I use this feature all the time. … (read more)

Today, when I go to print out a web page, the format of the Print Preview window has changed and the"Simplify Page" option is missing. I use this feature all the time. Without it many pages are impossible to print. How can I restore this feature?

Asked by dplant 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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PDF Viewer Toolbar Toggle

Hi. Is there a way to create a shortcut-key toggle to make the PDF Viewer toolbar appear and disappear? I've implemented the CSS code for removing the toolbar altogether… (read more)

Hi. Is there a way to create a shortcut-key toggle to make the PDF Viewer toolbar appear and disappear? I've implemented the CSS code for removing the toolbar altogether, but some key features require the toolbar. Hope there's a way to get this done. Thanks a lot!

Asked by Hithesh 1 year ago

Answered by Hithesh 1 year ago

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Missing "List all tabs" button when Firefox is maximized

Firefox has a "list all tabs" button, which looks like a "v" in the tabs bar, next to the plus. It works great but when I maximize the window (not F11 full screen, but W… (read more)

Firefox has a "list all tabs" button, which looks like a "v" in the tabs bar, next to the plus. It works great but when I maximize the window (not F11 full screen, but Windows OS Maximize Window), this button disappears. Seems like a bug; I can't think why you would want that button to be removed when the window is maximized.

Asked by jwdunham 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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How do I remove both the Fullscreen warning notification and the transition animation in switching to/back from fullscreen? (Firefox latest 2021)

Hi all How do I remove both the Fullscreen warning notification and the transition animation in switching to/back from fullscreen? Is it some option in about:config I rec… (read more)

Hi all

How do I remove both the Fullscreen warning notification and the transition animation in switching to/back from fullscreen?

Is it some option in about:config I reckon?

Thanks Vin

Asked by tvin7 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Credit card autofill does not fill form fields

I have Firefox 84.0.1 on Linux Mint, and I have filled in the information for one credit card. When I hover over credit card fields on retail site forms, I usually (but n… (read more)

I have Firefox 84.0.1 on Linux Mint, and I have filled in the information for one credit card. When I hover over credit card fields on retail site forms, I usually (but not always) get a pop-up "hint" showing the card number and/or expiration date ... but I cannot get the browser to actually fill in the form field. I've tried clicking, hitting Enter, hitting Tab, but nothing actually puts the information from the pop-up into the form field. Any hints as to what part of the incantation I am missing would be appreciated.

Asked by Paul 1 year ago

Answered by Paul 1 year ago

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Firefox "Print Preview" has disappeared from the File menu in 84.0.2

Firefox "Print Preview" has disappeared from the File menu in 84.0.2; all I have now is "Print", which brings up a Microsoft Edge style print dialog. Is this an upgradin… (read more)

Firefox "Print Preview" has disappeared from the File menu in 84.0.2; all I have now is "Print", which brings up a Microsoft Edge style print dialog. Is this an upgrading error, or is it just the way Firefox will be now?

Asked by firefox1202 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Increase Size of Picture-In-Picture mode?

When Picture-In-Picture mode first release, the size of the video was respective to the video's resolution, the window would increase in size the large the resolution and… (read more)

When Picture-In-Picture mode first release, the size of the video was respective to the video's resolution, the window would increase in size the large the resolution and decrease the smaller. This allowed the window to be customizable in size. Now, for me at least, every picture-in-picture video is a tiny window. Is there a way to tweak and increase the size of the video like before?

Asked by austridge 1 year ago

Answered by Daniel Ebenezer 1 year ago

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Firefox not displaying correctly but Chrome does!

I have attached 2 screenshots of the same website using Firefox and Chrome and the prices do not display on Firefox as you can see. The prices only show on Firefox for th… (read more)

I have attached 2 screenshots of the same website using Firefox and Chrome and the prices do not display on Firefox as you can see.

The prices only show on Firefox for the items at the bottom of the page but Chrome shows all item prices.

I am running Firefox 84.0.1 (64-bit) and the screenshot was takne when I ran it in Safe Mode with add-ons disabled to rule out them.

Any help would be appreciated as I need to use Chrome to see this correctly which means having 2 browsers open and I would rather use only Firefox.

Thanks.

Asked by Hawkeye 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Dragon NaturallySpeaking add on for Foxfire

I am disabled and cannot type, and colleges 100% online this year because of CovId 19. When I tried to download the add-on for Dragon naturally speaking the program I use… (read more)

I am disabled and cannot type, and colleges 100% online this year because of CovId 19. When I tried to download the add-on for Dragon naturally speaking the program I use to write Foxfire says that it appears to be corrupted and will not allow me to download it. I know it's not corrupted because I have downloaded it from the same site for chrome. Can anybody tell me how to get around this problem? My sincerest thanks Kevin Arthur Cleveland

Asked by Kevin 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Some websites' fonts are thin and barely readable

Hello, I have had this problem for a while now and I am not sure when it happened but it's been like this for around a year now. Some we websites (NOT ALL) appear to me l… (read more)

Hello, I have had this problem for a while now and I am not sure when it happened but it's been like this for around a year now.

Some we websites (NOT ALL) appear to me like they have a thin, pixelated font and it's hard to read them sometimes. See screenshot.

I have already checked my Windows' ClearType settings and that seems to be fine. Is there another solution to this?

Asked by SharpAmethyst 1 year ago

Answered by FredMcD 1 year ago

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Format of HTML bookmarks file

I want to set up a bunch of bookmarks in FF [84.0.1] and I cannot find out what the acceptable bookmark format is. [the bookmarks will come from someone else so I'd lik… (read more)

I want to set up a bunch of bookmarks in FF [84.0.1] and I cannot find out what the acceptable bookmark format is. [the bookmarks will come from someone else so I'd like to write a program to generate the appropriate import file]. I've tried edit an exported HTML file and then importing that [modified] file and it doesn't seem to work at all, so I'm clearly not understanding what has to be in the file so it'll work.

My plan/hope was to be able create a file with

<DL><P>
   <DT> FOLDERNAME 
   <DL> <P>
        <DT> <A HREF=URL> name for the bookmark</a>
       <DT> <A HREF=URL> name for trhe bookmakr</a>
               ...
    </DL>
</DL>

Is that even vaguely close to something that'll work?

Asked by BernieC 1 year ago

Answered by jscher2000 - Support Volunteer 1 year ago

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Other Bookmarks missing from my Toolbar

Other Bookmarks and its contents has disappeared from my toolbar. How do I bring it back? It is visible in my dorp downbox, but I need it available to me in my toolbar. … (read more)

Other Bookmarks and its contents has disappeared from my toolbar. How do I bring it back? It is visible in my dorp downbox, but I need it available to me in my toolbar. Thank you in advance.

Asked by CJ 1 year ago

Answered by Scribe 1 year ago