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Often (though not always) Firefox will prompt me to "Make Firefox your default browser" when first run or when run after being closed, despite me clicking "Set as default browser".

According to "KDE Settings / Default Applications", Firefox ESR is the default web browser and the default file association for HTML files. Firefox and Chromium (and I presume Konqueror) are installed. A similar laptop with similar software on it does not exhibit the problem.

What is Firefox actually checking to determine whether it needs to ask "Set as default browser"?

how to remove this line from vertical tabs bar? vertical tabs bar has another line above all tabs, below pinned ones, but it's not colored so it doesn't bother me, but this one is colored so i want to disable it

In version 143 there is no rollup window option that allows a linux system to roll the window up out of the way. The icon is a caret located in the top right corner of the window.

I'm using Firefox 144.0, running on Ubuntu 24.04. I have seen many "fixes" for this issue, posted here and elsewhere. None work for me. Tried turning off Privacy Badger and uBlock. Cleared Firefox cache. Tried Safe Mode. No go.

On the same machine, the problem does NOT occur when using Chrome.

I've seen multiple mentions of this issue, various places. I've tried all the fixes I've seen, save doing stuff with Java scripts.

Suggestions?

Thanks in advance for the help!

Mike

Machine: Dell Inspiron 15 CPU: Intel i5-7200U @ 2.5 GHz OS: Ubuntu 24.04 LTS RAM: 16 GB GPU: AMD Radeon R5 M445

Yesterday I switched on my PC, opened Firefox and the home page was black. See the attached screenshot. This is not caused by some accidental switching on of the dark mode. Dark mode is clearly off. Neither can I adjust settings to make the Google home page revert to its customary light grey shade.

This isn't a big deal, I know. And it has happened before and in a short period gone away by itself. Maybe it is to do with a glitch in the latest Firefox version. But it has an unpleasant appearance and discourages surfing.

My Chrome Google home page doesn't have this issue.

Can anyone advise on how to fix this unwanted black screen problem ?

When I close a tab, and try to find it in the recently closed tabs in the history, some i just closed, and without opening even a few others, they do not show up in the recently closed tabs list, while some I closed the day before are in there even when I filter to "Today" and that after" using Firefox for less than an hour and only had.

For one I think Today doesn't do that but rather the last 24 hours or similar.

It actually has been a problem for a very long time.

I can find most of them in the "Show all History", but that defeats the purpose of the recently closed tabs option.

I am using 143.0.4 (64-bit) AKA archlinux - 1.0, on Arch Linux I update every few days.

In my case today it was a Duck Duck Go search results page.

For the last two years the issues with video stutter have been worse and worse for me. I don't know if it is because of a different codec the video is using, but if it was I would expect the fans to ramp up from trying to decode it. Instead, my laptop stays always silent, but the video laggs like crazy when I want to play it at native 1440p.

I cannot view or change the video codec, since the current issue happens on a platform (herohero.com) other than youtube.

I'm trying to set different themes for normal and private browser windows (to easier tell them apart, same as with default theme) but can't find the way to do that. 😢

I've been using You Tube for many years now and a week ago You Tube just stopped the videos. Well I tried and tried different videos and all I get is this message. Video unavailable, this content isn't available. Try again Later and nothing happens. Can you please help me with this. Thank You

'bold text'bold textHow do I fix this step by step? To create an AppArmor profile for Firefox:

In /etc/apparmor.d/, create a file with the name firefox-local

In the file, add the following:

1. This profile allows everything and only exists to give the
2. application a name instead of having the label "unconfined"

abi <abi/4.0>, include <tunables/global> profile firefox-local /home/<USER>/bin/firefox/{firefox,firefox-bin,updater} flags=(unconfined) { userns, # Site-specific additions and overrides. See local/README for details. include if exists <local/firefox> }

Replace <USER> with your Linux user name. This assumes the Firefox install is at $HOME/bin/

Once you have saved the file, run sudo systemctl restart apparmor.service in the Linux terminal.

Tor browser 14.5.8 (based on Mozilla Firefox 128.14.0esr) LibreWolf 143.0.3-1 Each uses 100% of a CPU thread on Linux Debian 13 (Trixie) with KDE, while internet is not accessible for hours. I have tried to open new empty tab and close single website tab in Tor browser, but that did not decrease the load. Firefox 140.3.1esr also uses around 100% when i count up all its CPU threads load.

Can anyone reproduce this? Maybe the browser needs to run for some time so the issue is reproducible. If you have idea what to try (i will not use different Firefox version), let me know exact steps.

Hallo, ich habe nun schon mehrfach versucht meine Sprache im Settings umzustellen. Habe mich genau an die Anleitung gehalten. Aber ich bekomme einfach nicht die Sprache umgestellt. Ich will es auf Deutsch umstellen aber es bleibt alles beim englisch. Ich habe Cache schon gelöscht, habe meinen VPN ausgeschaltet und mehrfach den PC hochgefahren. Was läuft da bei mir falsch. Da ich kein englisch kann ist es etwas schwierig hier alles dann zu verstehen. Ich benutze Linux Ubuntu. Danke für die Hilfe.

Viele Grüße

Ute Hampel

So my question is Firefox is on my Cent OS 10 machine and it only shows the close button on the upper right corner, I would like to know two things, 1. How to add the Minimize, Fullscreen buttons to just the close button on the upper right corner. 2. How to get my menu bar back - the home button and all of the other goodies that normally show on the left of the browser just above the Forward, back and refresh buttons?

Thanks in advance for the help.

Dear Community,

the userChrome.css I used to use to disable the search bar expansion on focus no longer works (http://userchrome.wesleybranton.com/megabar). I disabled all urlbar.search options in about:config. But Firefox still gives me suggestions when I start typing about (as in about:config).

toolkit.legacyUserProfileCustomizations.stylesheets is set to true. The userChrome.css is inside the chrome folder inside the profile directory. I'm on 140.3.1esr (64-bit).

How do I disable this for good?

Thanks in advance!

Fedora froze and I had to reset my PC. Firefox hat quite a number of tabs open wich are still visible in history Recently closed tabs. When I click there on Reopen all tabs nothing happens.

How do I open all recently closed tabs?

First, why does the "recently closed tabs" doesn't work if you close an entire firefox window?

second, why isn't there a place to search through your tab groups?

I just accidentally closed a firefox window with a lot of tabs, including unnamed tab groups.

This is a pain for all browsers, but firefox took it a step further.

There is a "recently closed tab" page which is really convenient, until you need it most when you accidentally close multiple ones. On top of that, I lost multiple unnamed group tabs.

Am I missing something, or is the experience still subpar? I've been a power user of firefox for years now, and I get why I get clowned by chrome users ngl.

Have a problem getting page data? Had a campus directory page that before allowed wget2 to download pages fine for over 10 years. Now that modified pages, and get nothing? Can open the new page https://employeessb-prod.ec.guamcc.edu/EmployeeSelfService/ssb/campusDirectory#/lastName But trying to manually save page results in a 1.3M file, while using print to PDF gives a 50K file? Seems it is some kind of dynamic page, so the Save as gives a ton of garbage Java code, versus saving the final web page. Printing to PDF seems to take the final form and print the correct information.

Currently takes a 2 1/2 minutes to go to the first page, Ctrl-P, and print to PDF File. Then have to use Next option to go to pages 2-6, and manual print each one, changing the save file name each time. Makes like 6 50K files. Use pdftotext to change to text, and then combine into one file to extract data.

What took 6 seconds with wget2 to download, now takes 2 1/2 minutes??

A long time ago I was able to set the max number of rows for shortcuts on the Firefox home page to 5. Sometime fairly recently it has changed to 4. I don't know why nor can I remember which line in about;config I used to change it. I think the line was "browser.newtabpage.activity-stream.topSitesRows" but when I try to change it, it does nothing. At the time I first changed it, the max it would change to was 5. The max now appears to be 4 if I did it correctly. Your help would be appreciated.

Hi,

Every time I restart my Firefox browsers they will sign me out of my Mozilla account. I can see the email address associated with my account and 'Account disconnected'. I have to go through the process again every time I use it. I am using default privacy & security settings.

I am using :

140.3.1esr (64-bit) on Debian Trixie 143.0.4 (aarch64) on MacOS Tahoe 26.0.1 143.0.1 (64-bit) on OpenSuse Tumbleweed 20250929

Can you please help me resolve this?