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MP4 videos encoded with H264 say "Video can't be played because the file is corrupt"

I routinely record short screencasts with Kazam, and I can't watch my own videos after posting them on sites like GitHub because Firefox says "Video can't be played becau… (閱讀更多)

I routinely record short screencasts with Kazam, and I can't watch my own videos after posting them on sites like GitHub because Firefox says "Video can't be played because the file is corrupt". Or for example when I upload them to sites like ezgif to convert them to a GIF, which works just fine because, well, the file is not corrupt. Other browsers like Chromium play them just fine.

Apparently the "OpenH264 Video Codec provided by Cisco Systems, Inc" is properly enabled in my system. This has been happening to me for months or years, but only today I decided to open a thread here.

There are two things here:

1. Firefox can't play the file. I'm sure there's some sort of misconfiguration on my side, or bad defaults, or a missing plugin, or similar. 2. Firefox shows a misleading message. The file is not corrupt! The root cause is something else.

Any advice on how to fix the first one?

astrojuanlu 於 3 週前 詢問

Denis 於 3 週前 解答

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Crash when loading some tabs on VNC server host

Since the Firefox 99 update loading some pages (for example, the Gmail sign-in page) using Firefox on my Linux Mint machine, that I'm running a VNC remote desktop session… (閱讀更多)

Since the Firefox 99 update loading some pages (for example, the Gmail sign-in page) using Firefox on my Linux Mint machine, that I'm running a VNC remote desktop session on, results in a crash.

Crash report ID: bp-5dc1e89d-dc1f-40f2-9dbe-7f4380220419

I've tried running Firefox in safe-mode and the crash doesn't happen, but turning off hardware acceleration, swapping to default themes, removing all extensions, and completely removing Firefox and the .mozilla folder and then re-installing Firefox have not changed the crash behaviour in the absence of the safe-mode flag.

I would appreciate help in identifying what other paths of investigation I can take.

KhaanephEx 於 2 個月前 詢問

KhaanephEx 於 3 週前 解答

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how is profile blanked, but not fully gone?

Basically, a requested relaunch blanked my profile and I can't get it back. I have a lengthy workaround that will take over an hour to fix from backups, before this inci… (閱讀更多)

Basically, a requested relaunch blanked my profile and I can't get it back.

I have a lengthy workaround that will take over an hour to fix from backups, before this incident, but I'd really like to understand what's going on. How can my add-ons, bookmarks, history, logins, etc. be gone? If I did a refresh on purpose, why would my shortcuts remain intact? And, I started by backing up my profile folder to a neutral spot, so why isn't replacing it reversing the changes?

As background: The "about:profiles/Restart With Add-ons disabled" button brings up a small button dialogue to choose "refresh" or default "open." I selected "open" because I didn't want to fix my profile and assumed I would relaunch with only add-ons disabled, so this was a potential point of screw-up. I assume selecting "refresh" would reset application defaults and make a mess exactly like I find myself in now. Shouldn't "Restart with Add-ons disabled/Open" relaunch a temporary and reversible state? Doesn't "refresh" prompt a new default profile?

Considering evidence only, it appears I did something to roast my profile before I backed it up, but that's strange and really out in the weeds, and I'm assuming I wrecked it with my current activity.

The default profile name and path are correct. My shortcut links and labels that I use for a home page are intact but with icons missing, the same appearance as if I deleted the cache; is this detail part of application settings and not profile?

SkyHook 於 3 個月前 詢問

FredMcD 於 3 個月前 解答

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Prevent websites from opening new tabs

I just reinstalled my operative system, and with that my Firefox settings got reset. I know there is an entry in about:config to prevent ads from opening new tabs and pop… (閱讀更多)

I just reinstalled my operative system, and with that my Firefox settings got reset. I know there is an entry in about:config to prevent ads from opening new tabs and pop ups without authorization, even from legit websites like the login pop-up windows when doing a sign in in Google, in those cases to allow the windows it's needed to click on the lock icon next to the URL bar and allow it from there. The problem is that I don't remember the name of that setting and I have spend an hour looking for it on Google.

ttfh3500 於 4 個月前 詢問

ttfh3500 於 4 個月前 解答

  • 已解決

Address bar converts [fl] string fragments to ["I]

When I am typing an address or search term in the address bar, something happens to convert fl to "I. For example, as I type netflix.com, it ends up being net"Iix.com. Th… (閱讀更多)

When I am typing an address or search term in the address bar, something happens to convert fl to "I. For example, as I type netflix.com, it ends up being net"Iix.com. The address still works (I end up on netlfix) but it looks like there is a bug in how the text is rendered in the address bar. I am on Firefox 100.0.2 on openSUSE Tumbleweed

isaacheida 於 4 週前 詢問

isaacheida 於 4 週前 解答

  • 已解決

Mendeley Web Extension blocked on PDFs

Hi, I use Mendeley Web Extension to pull articles and other things from Firefox directly into my Mendeley library. I will usually rapidly read through the PDF file online… (閱讀更多)

Hi,

I use Mendeley Web Extension to pull articles and other things from Firefox directly into my Mendeley library. I will usually rapidly read through the PDF file online before deciding to add it or not. For some unknown reason, Firefox blocks the use of Mendeley on PDF file, for security reasons, and I can no longer add them to my library. Most references are only available as PDF files making the add-on completely useless. Is there a security feature that I can disable to be able to use the extension again?

Kind regards,

Mathias

mathias.rsl 於 1 個月前 詢問

TyDraniu 於 1 個月前 解答

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Full screen limited by window

When entering full screen mode it's only inside selected window. Also affects youtube player. Pictures when in full screen mode (using F11 key): https://imgur.com/a/gp3yq… (閱讀更多)

When entering full screen mode it's only inside selected window. Also affects youtube player. Pictures when in full screen mode (using F11 key): https://imgur.com/a/gp3yqCC

runiarcanes 於 1 個月前 詢問

runiarcanes 於 1 個月前 解答

  • 已解決

cannot fast forward or back while playing mp3 file

Using Firefox 100.0.1. Debian Linux. Dell 1525 with 4G ram. When playing a certain mp3 file in the browser, if I use the arrow keys, or the mouse, to skip forward or back… (閱讀更多)

Using Firefox 100.0.1. Debian Linux. Dell 1525 with 4G ram.

When playing a certain mp3 file in the browser, if I use the arrow keys, or the mouse, to skip forward or back, there is no response, but the audio stops playing for a period of time, then, finally it starts playing again at the spot it was before.

This does not happen with this file in Chrome, or in VLC. Also, with other mp3s it does not happen in Firefox.

I finally got it to work by converting the file to ogg vorbis, but this is not something I want to make a practice of..

I imported the file back into Audacity, and re-exported it as an mp3. Same result.

Weird... Any ideas?

Thanks,

gophild 於 1 個月前 詢問

jonzn4SUSE 於 1 個月前 解答

  • 已解決

Volume of cookies and website and cache data stored on disk.

Hi! First of all, I'd like to congratulate the community on the 100th edition of Firefox. The subject was selected as "other" because it is not a failure or problem, but … (閱讀更多)

Hi! First of all, I'd like to congratulate the community on the 100th edition of Firefox.

The subject was selected as "other" because it is not a failure or problem, but a suggestion for improvement related to the information on the volume of cookies and website and cache data stored on disk.

It's been a while since I noticed this and now I present it in writing asking whether or not it is feasible to implement the suggestion below.

In Settings / Privacy and security / Cookies and website data, the amount of “bytes” stored taking up disk space appears.

According to the detailed description on the subject, available at the address

https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox

there is a screen copy illustrating the explanations, for example:

Cookies and website data Your stored cookies, website data and cache are currently taking up 468 MB of disk space. know more

That's the point: "Your cookies, website data and cache stored are currently taking up 468 MB of disk space"

However, this information freezes when reaching 1.0GB.

The exact question: could this information be shown beyond the conditioned threshold until the user decides to clear all data?

Without further ado, I thank you in advance for your attention and, as far as possible, I look forward to hearing from you.

Yours sincerely, Ricardo Pinto. Basic Firefox User in Brazil

rhiccarddo 於 1 個月前 詢問

jonzn4SUSE 於 1 個月前 解答

  • 已解決

Unable to play Twitter/Reddit/Facebook Video and GIFs on Firefox 99.0.1 (64-bit)

I have fedora 36 Linux on my laptop and I have installed Firefox from the software store. The version in Help>About>About Firefox shows 99.0.1 (64-bit). I am able t… (閱讀更多)

I have fedora 36 Linux on my laptop and I have installed Firefox from the software store. The version in Help>About>About Firefox shows 99.0.1 (64-bit).

I am able to play videos on Youtube but no video or GIF is playing on Twitter/Reddit/Facebook.

I have installed media codecs as per this fedora help

My autoplay setting look like as per the attached image. I do not have any extensions except Bitwarden on Firefox.

I also tried playing videos on Firefox 100 by downloading it directly from firefox website but faced the same issue.

Bhanu Magotra 於 1 個月前 詢問

Bhanu Magotra 於 1 個月前 解答

  • 已解決

Log in problems on 3rd party websites

On certain websites I notices I have 'unknown errors' when trying to log in. Usually this is remedied by either using Chrome or clearing cookies and the cache. Both of th… (閱讀更多)

On certain websites I notices I have 'unknown errors' when trying to log in.

Usually this is remedied by either using Chrome or clearing cookies and the cache.

Both of there are inconvenient and result in a great deal of wasted time.

The usual response by these websites is "get Mozilla to fix this".

I'm getting sick of this.

I don't want to switch to Chrome but I will have to if this persists.

dominicpukallus 於 2 個月前 詢問

Amelia 於 2 個月前 解答

  • 已解決

How to open local files in Firefox 100 snap?

I'm on Ubuntu 22.04 which is using the snap package of Firefox. It seems that I cannot open local files in the /tmp directory. When I place a test.html file there and run… (閱讀更多)

I'm on Ubuntu 22.04 which is using the snap package of Firefox.

It seems that I cannot open local files in the /tmp directory. When I place a test.html file there and run `firefox /tmp/test.html`, it returns a file not found error. Why?

I don't have the problem with files in my home directory.

simon.eu 於 1 個月前 詢問

jonzn4SUSE 於 1 個月前 解答

  • 已解決

The Folder next to the Show Your Bookmarks Icon has disappeared

In my Bookmarks Toolbar I have created a Folder, 'News' and placed it at extreme left, next to the 'Show Your Bookmarks'. By clicking on the 'News' Folder I can see and … (閱讀更多)

In my Bookmarks Toolbar I have created a Folder, 'News' and placed it at extreme left, next to the 'Show Your Bookmarks'. By clicking on the 'News' Folder I can see and select any of my favorite Web news sites. Very handy. Today, however, when I clicked on the News folder my 73-year-old hand accidentally dragged the News folder on top of the 'Show Your Bookmarks' icon and the News folder disappeared !! I can't figure out where it went !! Help !!

Explorir 於 1 個月前 詢問

cor-el 於 1 個月前 解答

  • 已解決

Duckduckgo opens links as https://html.duckduckgo.com/html

Hi, I'm using Duckduckgo as my search engine, but when I type in a search string, it Firefox prepends it with https://html.duckduckgo.com/html/... This opens a search pa… (閱讀更多)

Hi,

I'm using Duckduckgo as my search engine, but when I type in a search string, it Firefox prepends it with https://html.duckduckgo.com/html/... This opens a search page that doesn't follow my dark theme. When I click on a link, another link is added that creates a link back to the same URL, causing a loop. This never happened before I upgraded to Ubuntu 22.04 & the latest version of Firefox, 100.0.2. How can I change this back?

Thanks!

   -John

jlcenter 於 1 個月前 詢問

jlcenter 於 1 個月前 解答

  • 已解決

Selection is not highlighted in Firefox and Thunderbird

Hello, When I select text in Firefox the selection is not highlighted. The selection itself does work (e.g. deleting a selected word) but is not visible. The problem occu… (閱讀更多)

Hello,

When I select text in Firefox the selection is not highlighted. The selection itself does work (e.g. deleting a selected word) but is not visible. The problem occurs in all fields where text can be entered, so the URL space, the search field but also text field on a page like this one. The strange thing is that the problem also occurs in Thunderbird.

I am using Ubuntu 18.04.6 LTS, Firefox 99.0 and Thunderbird 91.8.1

Jan FtFA 於 1 個月前 詢問

Jan FtFA 於 1 個月前 解答

  • 已解決

Web Applications are Distorted.

Whenever I use web-applications that use WebGL or anything similar, they are always distorted. And yes, I have tried disabling Performance Settings, but that only slightl… (閱讀更多)

Whenever I use web-applications that use WebGL or anything similar, they are always distorted. And yes, I have tried disabling Performance Settings, but that only slightly helped.

cromeydavid 於 1 個月前 詢問

cor-el 於 1 個月前 解答

  • 已解決

Firefox can't use my microphone

I haven't used my microphone in Firefox in years. I tried today, logged into Google Voice, which tells me it can't access the microphone. I set permissions in Firefox'… (閱讀更多)

I haven't used my microphone in Firefox in years. I tried today, logged into Google Voice, which tells me it can't access the microphone. I set permissions in Firefox's settings. I turned up all the mic settings in alsamixer. I tried https://mdn.github.io/web-dictaphone/ , recommended in another thread here, and it doesn't record either. I can use the microphone outside X, with sox's rec. I also can't record a new greeting in Google Voice.

Firefox 100.0.2 , Linux, Slackware 64-bit, all packages updated this morning.

RandomTroll 於 1 個月前 詢問

RandomTroll 於 1 個月前 解答

  • 已解決

Where is the trash folder for bookmarks?

FF 100.0.2 Ubuntu 22.04 LTS I have deleted my bookmarks with the Bookmark manager, but where are they now? I cannot find them in /trash and all of the *bookmark* files on… (閱讀更多)

FF 100.0.2 Ubuntu 22.04 LTS

I have deleted my bookmarks with the Bookmark manager, but where are they now? I cannot find them in /trash and all of the *bookmark* files on my laptop are miniscule (like 127 bytes.) The json files are no better, when I imported previous bookmark files they were empty.

Quentin 於 1 個月前 詢問

cor-el 於 1 個月前 解答

  • 已解決
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How to make "Say hello to a new Firefox" not appear next time I open Firefox

Hello, I'm using Firefox 91.4.1esr (64-bit) from Debian repositories on Bullseye. Every time I open Firefox, a window with a greeting message appears ("Say hello to a new… (閱讀更多)

Hello,

I'm using Firefox 91.4.1esr (64-bit) from Debian repositories on Bullseye. Every time I open Firefox, a window with a greeting message appears ("Say hello to a new Firefox"), and it doesn't matter if, as asked by that window, I choose a theme or not. Is this issue related to my settings? Is this a Debian issue? Is it possible to stop that window from reappearing?

Thanks in advance. And many thanks for making Firefox (I've been using it for so many years I can't recall when I tried it for the first time).

Esteban

lucchesi.esteban 於 6 個月前 詢問

lucchesi.esteban 於 6 個月前 解答

  • 已解決

I keep on being logged out on computer reboot on Garuda Linux

When I restart my computer, I am logged out of all websites although I did not select settings such as "Delete cookies and site data when Firefox is closed". This only ha… (閱讀更多)

When I restart my computer, I am logged out of all websites although I did not select settings such as "Delete cookies and site data when Firefox is closed". This only happens with reboots and not on Suspend.

I saw two similar posts but the options look like they changed name since then: https://support.mozilla.org/en-US/questions/1319622 https://support.mozilla.org/en-US/questions/1289909

I tried to apply the solutions linked there, to no avail.

This behaviour only happens on my Garuda Linux and not on Pop-os. Thus I am not sure here is the right place to ask this question.

Another strange bug which may be related is the following: if I zoom in a page (say set it at 120 percents) then go to another tab and then come back to the page I zoomed in, the zoom is reset to 100 percents.

Any help would be greatly appreciated!

benoitseron 於 1 個月前 詢問

Paul 於 1 個月前 解答