All Products Community Forum

I am experiencing an issue with the Picture-in-Picture (PiP) functionality in Firefox on Ubuntu. Unlike on Windows, where the PiP window automatically appears when switching tabs or pages, this does not happen on my system.

When I manually activate the PiP feature by clicking the button, the window does appear; however, it is placed behind the browser window and remains at the lowest level among other open windows. This causes it to be obscured by other applications and requires me to manually bring it to the front and adjust its position every time.

Is there a way to automate this process or resolve the issue so that the PiP window behaves as expected (i.e., stays on top of other windows and works seamlessly)? Please let me know if there are any settings, extensions, or workarounds that could address this problem.

Thank you in advance for your assistance!

Can’t launch Firefox 3.5.19 on Linux Ubuntu When trying to run with:

./firefox

Terminal gives the following:

./firefox-bin: error while loading shared libraries: libdbus-glib-1.so.2: cannot open shared object file: No such file or directory

By all, I mean images, json files that appear to be configuration for TB, not just remote http(s) links. This makes reading mails with inline images annoying at best, impossible at worst. The browser quickly fills up with rubbish.

Hi. There is a problem with video playback when skipping through the video using a playback bar. The video (but not audio) freezes at the spot when one skippes to another part of the video and re-establishes after a while (not so short while) to the part of the video that is currently played. I'm using Linux Fedora.

After almost three weeks of hacking I finally solved my [are not working] problem. (It was very difficult, including creating a new `https` setting and hand-editing the profile's `handlers.json` file.) So now I can finally open links in emails like I could in TB 102 before upgrading to 128. Since I have "Always ask" set, I get a dialog with a choice of which web browser to use. All good.

Problem is that the browser dialog pops up a minimum of once per hour whether TB is open (not minimized/iconified) or not. (I leave TB running at all times, often for months at a time.) This is annoying, particularly because the URLs are to internal TB infrastructure, usually but not always https://notifications.thunderbird.net/2.0/notifications.json.

What should I do with these JSON links? Many don't even have a filename in the URL, so I can't save them in my profile folder even if I wanted to. If TB wants them as updates shouldn't it know where/what to do with them, and do it? I suppose I could turn off "Always ask", which I don't want to do -- would TB handle the URLs correctly then? Or would it just open the link in the default browser and I'd be worse off than I am now? (I usually just "Cancel" the dialog and don't go to the URL.)

It would be even better if I could completely turn off all notifications, period. I always have "Check for new messages every ... minutes" turned off and manually check my POP/IMAP messages when I want to. I'll update TB when my Linux distro has a new version. In fact I've always noticed that TB runs continuously as a background process, adding a small percentage to a CPU core's usage. Is there any way to turn this off, too, so that TB is completely quiescent until un-mininized and "Get Messages" or "New Message", etc. is clicked?

Any help appreciated. I've used Thunderbird exclusively as my email client for over 20 years, and IMO these kinds of new features and the breakages they cause have made things continuously worse since the days when I used TB 68 and 78. BTW, I've tried all the above in 115 and 137 with the same problems.

Sometime last week, my snap thunderbird package updated to version 128.9.1esr. After that update, clicking on the Thunderbird icon in the dock starts thunderbird under a generic icon that appears on the right side of the dock (showing the dot indicator under it), rather than showing the thunderbird icon with the running indicator under it.

I am using X11, fully updated Ubuntu 24.04.2, with Thunderbird installed as a snap. Work correctly until last week. If I start the application manually from the command line, same generic icon appears. (If I start firefox snap from the command line, the firefox icon shows the "running" indicator under it as it is supposed to.

Note: Thunderbird IS running and running fine - I have not found any other issues, just this potential regression.

Anyone have any ideas? I thought I would post here before filing a bugzilla bug report. I was not able to find any mention of this (or a similar) problem in the last year.

Thanks.

I'm attempting to set up Firefox in a newly installed OS and have logged into my Sync account. Many aspects seem to be loaded in, but the status via the Settings is stuck at "Syncing..." despite waiting several hours. Quitting Firefox results in a crash window popping up.

There are no files in the weave/logs directory. The weave/failed directory has multiple json files; most almost completely empty. addons.json has an ID, but that's pretty much it.

Deleting the .mozilla directory and starting over yielded no change in behavior.

Any help would be appreciated. Thank you.

I run Firefox under Linux Mint. Both are always update to the latest level. Over the past 1 to 1.5 years, across updates to both Firefox and Mint and multiple 'clean' installs of Firefox, I have experienced many crashes from Firefox per week. Sometimes there will be as many as 5 per day, but never less than one per day. During the same period I have also been running Vivaldi; it has not crashed once in that time. Now I have to do something. If there is a simple way to perform 'problem source identification', that is within my capability, I would be grateful for advice. If there is not, then clearly I will have to un-install Firefox.

As far as I can tell both of these browsers run with just 1 add-on/extension: uBlock Origin. Disabling this extension in Firefox does not stop Firefox from crashing.

That is the first line in the Hippocratic Oath. All doctors have to swear to it. All software developers should too.

I made the mistake of letting Firefox on KUbuntu update. It obliterated all my tabs and all my history. There's nothing left. I had a lot of tabs open with intent to use them to update some astronomy instructional activities. I don't know if I'll be able to find them again.

I don't really have a question except to ask: What fresh hell is this? Is it really that hard to just leave things the hell alone? I'm afraid to ever update Firefox again. If everything else wasn't based on Chromium, I'd be out of here.

Also, it looks like something out of Windows 7.

It's all gone. It's a wonder you didn't delete all my bookmarks while you were at it.

Hello,

Since the update to version 137.0.1 (aarch64), it is not longer possible to drag and drop attached documents from a message to a folder.

Message from error console: Uncaught NS_ERROR_FILE_UNRECOGNIZED_PATH: Component returned failure code: 0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH) [nsIFile.initWithPath]

   getFlavorData chrome://messenger/content/mailCore.js:1000

I'm on Mac Sequoia 15.4, MacBook Pro M4.

Thanks in advance if someone can help

Patrick

Hi, I have a strange experience with thunderbird's calendar: an hour or two after i created a new appointment in my calendar, i cannot change this appointment anymore. When i do so, this appointment is not saved anymore when i click on "save & close". When i alter and save this appointment within the hour it works normally and the item is saved as expected. I searched the settings, but nothing could be found concerning this issue. My OS: Ubuntu 24.04.2 LTS. Thank you very much for your efforts. Wyl. Holland.

Firefox 136.0.1, Linux 6.8.0-55, have set Okular as default pdf application, however Firefox will not open pdf file when downloaded nor will it open the file when selecting Open File from the Download Icon on the toolbar. Only was I can get to file is to select Show in Folder option and open from within Dolphin.

I use tiling for my windows. After minimizing and then restoring the windows, the tab bar is no longer displayed. If I don't tile the windows, this error doesn't occur. I'm using the latest version of Mint Cinnamon. This error also occurred in debug mode.

$ wmctrl -m Name: Mutter (Muffin) Class: N/A PID: N/A Window manager's "showing the desktop" mode: OFF

I am running Thunderbird on an older HP Probook with Debian 11 installed. On April 9 or 10 the machine did an OS performance and security update and after that Thunderbird will not open. I have uninstalled and reinstalled the program to no avail. It will not open from Gnome or Terminal. I am not that technical but I know there is a way to fix this. Also I need to make sure my emails are not lost. Thank you, Jimmy Rone

OS: Xubuntu 24.04.2 Apache: 2.4.58 Firefox 137.0.1 and earlier

In general Firefox is working. However, after every update, both major as well as point releases, where Firefox updates and then restarts itself, it almost always starts up and displays the homepage (local page on my machine) but is completely unresponsive. It will not load a locale or a remote page. I can kill all running firefox processes and then manually restart the browser -- with the same behavior. I have discovered that if I wait for around 10 minutes or so, then the browser starts working and continues to work just fine until the next update. Once past this initial update wait, I can kill/restart the browser, reboot, etc. and Firefox is responsive. It is only immediately after the updates that this problem occurs. This has been going on for at least the past six months or so, but is new behavior that didn't exist prior to that. This isn't a show-stopper, but it is very frustrating.

Any suggestions.

Is this a bug or config problem?

Occasionally, FF (Linux desktop) starts using a lot of memory. I kill tabs (sometimes it is OK to kill YouTube or X, sometimes not)

Eventually it starts impacting the system using so much memory. I terminate the FF instance. Often. More often than not. There is a separate task still running and I get the "Firefox is still running" when I try to restart. I then kill the remaining FF task via the OS or the process monitor. Then FF restarts.

Is this an issue with addons (I am running very few - uBlock Orign, and Privacy Badger and Cookie AutoDelete. Are the only ones active most of the time) Or is it an actual bug with garbage collection, and tasks getting away? Or is it an OS issue?

I was trying to go to ssa.gov, today, and hit the button to login. When I did that, I got a 400 page saying: Bad Request

Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit.

I have done this before, and it worked. To test if it was a problem with the web page or the browser, I did it from another browser (Brave), and it loaded fine. Is Firefox sending a bad request? Is this something you can fix.

I am using Mozilla Firefox for Linux Mint 137.0.1 (64 bit).

Hi there,

I'm experiencing a theming issue when using Firefox (flatpak) on Hyprland with a pure black (#000000) theme applied via a theme extension. When the Firefox window is out of focus, everything looks fine — the background is truly black as expected. However, when the focus is on the window, the blacks turn washed out grey, losing the #000000 appearance. This doesn't seem to happen in other apps and I don't seem to have any filter for the focused windows (except for borders), so it seems related to how focused windows are handled in Hyprland or how Firefox draws its content under Wayland - have you heard about this issue and could you help me diagnose it + find a solution? Is there a setting I could tweak either in Hyprland, Firefox, or GTK/Qt config to prevent this color shift on focus? Thanks in advance!

I recently upgraded from Thunderbird 116 to 128 on Kubuntu 22.04, since then it has crashed at least once every day.

For some reason it is unable to send a crash report, instead I get the attached window pop up.

I am trying to reach an internal company website ([URL]), with a certificate chain rooted in a company certificate authority. This works fine in Chrome, and worked in Firefox on my previous computer. But i recently got a new machine, and something somewhere is not quite right. I get an error message looking like this (between the ~~~s):

~~~ Someone could be trying to impersonate the site and you should not continue.

Web sites prove their identity via certificates. Firefox does not trust [URL] because its certificate issuer is unknown, the certificate is self-signed, or the server is not sending the correct intermediate certificates.

Error code: SEC_ERROR_UNKNOWN_ISSUER

View Certificate ~~~

If i click on the error code, i get these details:

~~~ [URL]

Peer's Certificate issuer is not recognised.

HTTP Strict Transport Security: false HTTP Public Key Pinning: false

Certificate chain:

[certificate]

[certificate]

[certificate]

~~~

If i click 'View Certificate', i get a chain of three certificates:

1. Subject common name = [certificate]
2. Subject common name = [certificate]
3. Subject common name = [certificate]

If i go to Settings > Privacy & Security > View Certificates > Authorities, i can find both the [certificate] certificates. As far as i can tell, they are identical - i can open the certificate from 'View Certificate' and the corresponding one from the certificate manager and flip between tabs, and all the details are the same.

I am using Firefox 120.0, via a flatpak, on Ubuntu 22. I have given the flatpak access to /etc/ssl/certs, where my company's internal CA certificates are located.

To me, this seems like it should all work. The server has a certificate signed by an internal CA, which is signed by another internal CA, and both those internal CA certificates are in my certificate manager. So what is going wrong? Is there any way i can debug this?