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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-… (閱讀更多)

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?

WoodyFF 於 1 年前 詢問

WoodyFF 於 1 年前 解答

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Firefox blocks me from saving images

Lately, I keep finding more and more websites that are able to prevent me from downloading their images. It seems this is becoming a huge problem now, and it's changing t… (閱讀更多)

Lately, I keep finding more and more websites that are able to prevent me from downloading their images. It seems this is becoming a huge problem now, and it's changing the entire experience of using the web.

And it seems to me that Mozilla are enabling developers to do this, trying to take away people's rights.

In the past, I could work around the problem (not that I should have to) by going to Tools > Page Info > Media. But even that method no longer works (eg go to www.bbc.co.uk - the large image in the top left is nowhere to be found in Media!) There are also sites which show PDFs that cannot be downloaded. That is just SO wrong!

The ability to save any image in a web page is a basic liberty of using the web, always has been. No website should be allowed to display images that can't be downloaded, it's just wrong. It's like someone making a magazine out of special paper to stop readers tearing pages out!

I've sent feedback about this through the Help menu, but no one ever listens.

Does anyone here have the ability to raise this issue with Mozilla? This needs to be FOUGHT against. They are helping large corporations to slowly strip away the basic rights of the public. Saving pictures may seem like only a small detail, but it ultimately leads to a 100% premium internet where no one can keep or save anything. Mozilla is taking the internet out of the hands of the public and putting it the hands of big businesses.

The issue of 'protecting copyright' is completely irrelevant. Any criminal operation determined to leech images would obviously have the ability to do this regardless. Plus, if companies don't want people to be able to download the high-res version of an image, they shouldn't put it online.

MartyJames 於 1 年前 詢問

jscher2000 - Support Volunteer 於 1 年前 解答

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Firefox flickering after update 90.0.2

Hi all After update 90.0.2 installed on my computer, FIrefox started flickering all the time a new page gets opened. I have never had such a problem before, nor I had any… (閱讀更多)

Hi all After update 90.0.2 installed on my computer, FIrefox started flickering all the time a new page gets opened. I have never had such a problem before, nor I had any hardware change in the last two months. I tried several proposed solutions concerning flickering like refreshing, disabling hardware acceleration etc. but nothing helps. I wonder what happened in 90.0.2 which caused that. I just installed update 91.0 and the flickering still persists.

I am using Windows 7 Enterprise 64-bit on a Dell Vostro 3750 Laptop if that matters. Thank you

georgi.petev.nikolov 於 1 年前 詢問

jonzn4SUSE 於 1 年前 解答

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CSS help needed: how do I recolor bookmark drop-down menus?

So I've got Proton UI forced on me today in 92.0 update and accordingly had to spend my entire evening trying to repair all of the damage. So far I've managed to fix menu… (閱讀更多)

So I've got Proton UI forced on me today in 92.0 update and accordingly had to spend my entire evening trying to repair all of the damage. So far I've managed to fix menu spacing and the way tabs look all while not breaking previous walls of text in userChrome.css meant to fix even older UI problems. Still one thing I failed to find any solutions to is the bookmark drop-down menus color issue. Those menus used to be gray, but now they are all bright white, which to me is super annoying. Any tips on how to fully recolor those?

jbrandom2 於 1 年前 詢問

cor-el 於 1 年前 解答

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Unable to download Google Drive files in Mozilla browser

Hi Mozilla Community, Currently on version 97.0.1 of Mozilla and have not been able to download any files from Google Drive. When I click on a files to download it just k… (閱讀更多)

Hi Mozilla Community,

Currently on version 97.0.1 of Mozilla and have not been able to download any files from Google Drive.

When I click on a files to download it just keeps loading scripts at the bottom like - docs.0k.cc.googledocs.... and nothing happens.

I have read countless of links to solve the issue and still it won't download any files - only uploads is fine.

So I have: - clear cache/cookies - disable addons like Adblock etc - privacy & security set on Standard in settings - added cookies exceptions- googlecontent, googledrive etc - turned off Enhanced Tracking Protection

What else is missing as to why it has stopped allowing me to download files? Its quite frustrating when it use to work when I enable the third cookie party and now the setup doesn't seem to accept it.

Mozilla is my default browser and prefer to use it rather always switch to Chrome for downloads.

I've contacted Google about Google Drive and they said the problem is not on their side.

So any help would be appreciated!!

booboo_girl21 於 7 個月前 詢問

AliceWyman 於 7 個月前 解答

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Middle click, aka wheel click, does nothing

I just recently upgraded to Firefox 87.0 (64-bit) for Windows 7. Before the upgrade if I wheel clicked on a link it would open up in a new tab. Now it does absolutely n… (閱讀更多)

I just recently upgraded to Firefox 87.0 (64-bit) for Windows 7. Before the upgrade if I wheel clicked on a link it would open up in a new tab. Now it does absolutely nothing. I've even tried holding the wheel click for 10 seconds, still nothing.

I have verified the following settings in about:config; browser.tabs.opentabfor.middleclick=true middlemouse.contentLoadURL=false middlemouse.paste=false middlemouse.scrollbarPosition=false

When I was doing a search for related questions to this problem I found a user 3 years ago had a similar problem, and that they had an addition setting: middlemouse.openNewWindow=true. This setting no longer seems to be there. I have no idea if this setting was recently removed, and is the source of my problem, or if it was removed a while ago and my problem is the result of some other change. I have restarted Firefox twice, and even rebooted my laptop, in an effort to fix this problem. Nothing has worked. Depending on what I am doing I rely on using the wheel click HEAVILY, as it is much simpler to close a tab then to hit the back button 4, 10, or 20 times to return to where I started, or if I'm trying to keep track of what links I've followed from doing a search without having to re-do the search and hope I get the exact same results (with Google I never do).

At this time I am already heavily inclined to just return to the previous version of Firefox, despite how much of a pain that will be, however this is a recently released update, so I feel I should give the devs a chance to fix any new bugs from the update. That, and I won't have the time around work for several days, probably over a week, which makes it more practical to give the devs a chance to release a patch that fixes the problem.

razmoudah1 於 1 年前 詢問

razmoudah1 於 1 年前 解答

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I CANT GET ON TO TESCO'S AGAIN????

Hi, IM having trouble getting on to TESCO.COM , i can get on with GOOGLE but with Firefox it keep saying :- == Oops... It looks like something is not right If you are s… (閱讀更多)

Hi, IM having trouble getting on to TESCO.COM , i can get on with GOOGLE but with Firefox it keep saying :-

==

Oops... It looks like something is not right

If you are seeing this page it is because your browser has failed some security checks

You may still be able to browse our site to find the feature or store you're looking for. Go to homepage, Contact Us, Site Map.

If you continue having trouble please contact our customer service helpline on: 0800 323 4040

Reference Id: 18.79476768.1594138726.1d58126e

=

THIS keeps on happening at least 6 - 8 a year. ive cleared the cache off Firefox, rebooted it, got a now TESCO site and it is still the same. Yet Google fires up all right all the time. I have got 3 pc of a type and they all can get TESCO without any trouble. Ive been with you for 20yrs and am reluctant to change noW. Tesco just say your better of using Google than Firefox, which isn't much help. Yes they can get me on (sometimes) but they all ways say Google is the one really.

There must be something i can do?

ron1011 於 2 年前 詢問

FredMcD 於 2 年前 解答

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What is in the profiles/storage/default folder?

The profile my wife uses has almost 400 MB in the profiles/storage/default folder and & looks like every link she has ever clicked on. She uses AOL for her home page … (閱讀更多)

The profile my wife uses has almost 400 MB in the profiles/storage/default folder and & looks like every link she has ever clicked on. She uses AOL for her home page & clicks on all sorts of news articles.

How do I trim down its size? Can I delete some history, such as old stuff? Thanks

Mike109 於 1 年前 詢問

jscher2000 - Support Volunteer 於 1 年前 解答

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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. … (閱讀更多)

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?

dplant 於 1 年前 詢問

jscher2000 - Support Volunteer 於 1 年前 解答

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What content is required in userChrome.css to move the tabs bar under all other bars?

Every solution which I have found for Firefox 89 "Proton" so far which moves the Tabs Bar below the Navigation Bar (AKA "address bar"), with the Menu Bar above it, does N… (閱讀更多)

Every solution which I have found for Firefox 89 "Proton" so far which moves the Tabs Bar below the Navigation Bar (AKA "address bar"), with the Menu Bar above it, does NOT move the Tabs Bar below the Bookmarks Bar. The Bookmarks Bar appears to be overwritten and blank, and occupies space below the Menu Bar, Navigation Bar, and Tabs Bar. This empty space separates the three bars which are implemented and the content of the currently-selected tab below it.

Currently, my userChrome.css file is a copy posted by Corel-10 (?): __________________________________________________________________________________________________

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

/* TABS: bottom - Firefox 65 and later - updated for 89+ */
/* https://searchfox.org/mozilla-release/source/browser/themes/shared/tabs.inc.css */
/* https://developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox */

/* TABS: below nav-bar - Firefox 65 and newer - fixed 89+  */

/* ROOT -variables */
*|*:root {
  --tab-toolbar-navbar-overlap: 0px !important;
  
  --tab-min-height: 25px !important; /*override density*/
  --tab-min-width:  80px !important; /*override default*/
}

/* TABS: below nav-bar  */
#navigator-toolbox toolbar:not(#nav-bar):not(#toolbar-menubar) {
  -moz-box-ordinal-group: 10 !important;
}

#TabsToolbar {
  -moz-box-ordinal-group: 1000 !important;
}

/* TABS: position */
#TabsToolbar {
  display: block !important;
  position: absolute !important;
  bottom: 0 !important;
  width: 100vw !important;
}

#tabbrowser-tabs {
  width: 100vw !important;
}

/* navigator-toolbox: PADDING */
*|*:root:not([chromehidden*="toolbar"]) #navigator-toolbox {
  padding-bottom: calc(var(--tab-min-height) + 1px) !important; /*ADJUST*/
  position: relative !important;
}

/* TABS: HEIGHT */
#tabbrowser-tabs,
#tabbrowser-arrowscrollbox,
#tabbrowser-tabs .tabbrowser-tab {
  min-height: var(--tab-min-height) !important;
  max-height: var(--tab-min-height) !important;
}

/* TABS: APPEARANCE */
#TabsToolbar {
  height: var(--tab-min-height) !important;
  margin-bottom: 1px !important;
  box-shadow: ThreeDShadow 0 -1px inset, -moz-dialog 0 1px !important; /*OPTIONAL*/
  background-color: var(--toolbar-bgcolor) !important;
  color: var(--toolbar-color) !important;
}

/* indicators - hide  */
.private-browsing-indicator {display: none !important;}
.accessibility-indicator    {display: none !important;}

/* window controls in full screen - hide*/
#TabsToolbar #window-controls {display: none !important;}

/* caption buttons on tab bar - hide */
*|*:root[tabsintitlebar]:not([inFullscreen="true"])
 #toolbar-menubar[autohide="true"] ~ #TabsToolbar
 .titlebar-buttonbox-container {display: none !important;}
<nowiki></pre><br>
________________________________________________________________________________________________

Evidently, the text editor for this website does several things to the above original text that, frankly, seem unnecessary and undesirable. The .CSS file is just an unformatted text file, so what is the problem with simply copying its contents and pasting it in to the body of this post?

Which is also to say that I do NOT have a clue as to what any line in the file is meant to do, what effect it has, why it is even in the file at all, or why it is written in the way that it is. So DO NOT tell me that I "CAN" create a Cascading Style Sheet on my own when I cannot even modify one that has been provided. 

On the face of it, something is missing from the above CSS text. What change needs to be made to the above content so that the Bookmark Bar will appear between the Navigation Bar and the Tabs Bar??

Thank-you very much for your time and attention to this request for assistance.

Blacklisted 於 1 年前 詢問

DB-1 於 1 年前 解答

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I lost bookmarks and user passes after firefox update

I lost bookmarks and user passes after firefox update. new version of firefox is 77.0.1 (64-bit) I read the related questions but did not understand how I could recover.… (閱讀更多)

I lost bookmarks and user passes after firefox update. new version of firefox is 77.0.1 (64-bit) I read the related questions but did not understand how I could recover. and attached pictures of my profile.

hsamadzadeh 於 2 年前 詢問

FredMcD 於 2 年前 解答

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How to change the Tab color for inactive tabs?

How to change the Tab color for inactive tabs? I have a userChrome file and have been able to change the color of the active tab but cannot do so for the inactive tab. Th… (閱讀更多)

How to change the Tab color for inactive tabs?

I have a userChrome file and have been able to change the color of the active tab but cannot do so for the inactive tab. The inactive tab color blends into the toolbar color. If I move my mouse cursor over it changes to a slight darker gray color.

Active tab color. I made mine a off white color:

.tab-background[selected="true"] {

   background-color: #f9f7f1 !important;

}

davidhelp 於 7 個月前 詢問

davidhelp 於 7 個月前 解答

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Weird Scrolling with version 83

Good Morning Today I had to repair Firefox and after restarting, I felt a strange scrolling sensation, it was not the normal Firefox scrolling, I even thought I had opene… (閱讀更多)

Good Morning

Today I had to repair Firefox and after restarting, I felt a strange scrolling sensation, it was not the normal Firefox scrolling, I even thought I had openend the wrong browser...so I went check about:config , and found some values where changed as new default values:

general.smoothScroll.mouseWheel.durationMaxMS 200 general.smoothScroll.mouseWheel.durationMinMS 50

I tought it was me the problem so I installed an older version of Firefox (80.0) in order to compare, and found a normal scrolling and those values:

general.smoothScroll.mouseWheel.durationMaxMS 400 general.smoothScroll.mouseWheel.durationMinMS 200

I think this is a mistake from devs, if i wanted to have horrible scrolling, I could just use Edge instead of Firefox, could you please bring the original scrolling back to Firefox?

Thanks

Wolfy 於 1 年前 詢問

jumpnjil 於 1 年前 解答

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Mozilla FTP Access via FileZilla is not working...

with the planed removal of FTP support from Firefox I am at my wits END... I cannot seem to get FileZilla to connect to ftp.mozilla.org what connection type should I sele… (閱讀更多)

with the planed removal of FTP support from Firefox I am at my wits END... I cannot seem to get FileZilla to connect to ftp.mozilla.org what connection type should I select and WHAT port number am I suppose to be using? anonymous login is fine right?

Melchior (aka Joseph) 於 2 年前 詢問

cor-el 於 2 年前 解答

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Video lagging

Hello, I have issues with Firefox developer version for couple months now, when I play videos, like youtube, or other sites they constantly lag. They play for like 1min a… (閱讀更多)

Hello, I have issues with Firefox developer version for couple months now, when I play videos, like youtube, or other sites they constantly lag. They play for like 1min and lag, continue for another 2min then lag etc etc. (even short videos on twitter lag). It was not like that before and I don't have this problem in other browsers. Does anyone know what can be the problem here? Thanks

nicaya 於 1 年前 詢問

Bithiah 於 1 年前 解答

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Turning Off Update Reminders in Firefox

Hello, How can I permanently deactivate this nagging update reminder in the upper right corner (green arrow over Application Menu button) and frequent pop-ups in upper r… (閱讀更多)

Hello,

How can I permanently deactivate this nagging update reminder in the upper right corner (green arrow over Application Menu button) and frequent pop-ups in upper right corner where I have to repeatedly click on "Not Now"?

I'm not upgrading to v89 because the next update will once again BREAK my userChrome.css code and my user interface (with tabs on bottom and custom button images) will appear scrambled.

I'm quite tired of having to jump through hoops and search for CSS solutions to fix these issues every few updates. It causes me too much anxiety.

I'm sticking with v88.0.1 for the forseeable future.

How can I shut off this annoying update reminder permanently?

Thanks.

Slouch 於 1 年前 詢問

Slouch 於 1 年前 解答