Diễn đàn hỗ trợ Firefox

With my previous FF installation, it would remember both the width and the last selection in the sidebar after closing and re-opening FF.

I just formatted and reinstalled windows and now FF simply would not remember the last sidebar condition.

I'm using Windows 10 22H2 and FF 130 64-bit.

I haven't figured out how to get Firefox to fill in Verification Codes when logging into web sites that require such.

Can you provide steps to this feature?

I tried to create a default Windows profile with pre-configured app settings, including FF. I created a temporary user, logged in, installed FF and configured it, also installed some add-ons (first of all, ublock origin). Then I logged out, logged as an administrator and moved the temporary user profile to the default profile location (c:\Users\Temp -> c:\Users\Default), and then reset its NTFS permissions. This almost always works for all applications, including Google Chrome. I created a new user and logged in, opened FF. The settings were applied, but the extensions did NOT work, and even the buttons on the toolbar looked like empty squares. At the same time, the add-ons were present in the list of add-ons in settings, although without icons. It helped to turn off and turn on all the add-ons one by one, manually.

After some research, I realized that FF binds its settings to absolute paths to add-on files (*.xpi), specifically in the $profile/extensions.json and $profile/addonStartup.json.lz4 files. Google Chrome, for example, doesn't do anything simular, like the vast majority of applications. Removing these files from the profile will cause all add-ons to be "reinstalled" on first launch and set to a disabled status.

An easier way to reproduce the problem: 1. Run firefox -profile d:\temp\profile1 2. Install some extensions. 3. Rename profile1 folder to profile2. 4. Run firefox -profile d:\temp\profile2 5. Got it!

For what purposes does firefox bind to absolute add-on paths, and how can this problem be solved? P.S. I know about portable firefox from PortableApps.com, but I don't want to use a third-party loader for my tasks.

My settings have this right at the top, but I am the "organizer." I am the one that set things up on my oldest laptop. When I updated the laptop with a new one, I had that message, but it was okay at that point. But now - new laptop, and I want the control back. Please guide me in how to do that.

Firefox inhibits power management, causing the screensaver to not activate. This happens when I am not running a video. It happens if I open a website that has video but I do not run the video. If I turn off Firefox the screensaver works. Screensaver is set to activate at 5 minutes. Power Management is set to turn off screen when inactive for 7 minutes. Linuxmint 21.3. and on another computer - Linuxmint 22.0

I have started to use the vertical tab layout because the ability to collapse the tab bar gives a lot of extra screen space to work with on my laptop. I like to be able to split my screen between different apps to work with.

When I try to split screen Firefox with vertical tabs enabled the window cannot be resized down to a little more than half the width of my screen. So it has to take up a just little more than half my horizontal screen space. Even though I can collapse the tab bar to see the page.

Is there a way I can circumvent the unnecessary horizontal window resize limit when vertical tabs is enabled?

Bonus question: When I do reduce horizontal window size it hides the button to collapse and open the sidebar. So I lose a lot of essential control. Is there a way to pin it so it won't disappear no matter what?

Hi everyone! Help me to solve the issue to get rid of these two folders in sidebar and drop-down menu. Is there any kind of tweaks css? I use Firefox 130.0 version. Look at the screenshot https://postimg.cc/vx5PCK0q

This link https://support.mozilla.org/questions/1389957 helped me but not for all cases.

My browser is not working as it should. Several sites do not work anymore and the browser keeps crashing. I'd like to refresh the browser, but the button is missing. I tried going to troubleshooting mode, but the button is not there either.

Not sure if uninstalling would do the same thing? Just not sure what is the best way to refresh. Thanks for any help!

Hello

Recently I've upgraded from Kubuntu 24.04 to 24.10. I'm almost sure that the minimize/restore buttons were available in my Firefox after the system upgrade. For the last few days I can see they are missing - please see attached images.

I can partly fix the problem by going to Settings->More tools -> Customize toolbar and selecting "Title Bar" checkbox. In that case I have the title bar displayed with all 3 button (minimize, restore, close).

But I would like to have the default behavior: title bar is turned off and the mentioned 3 buttons be visible in the tab bar.

How to have those buttons in the tab bar when the title bar is turned off?

I'm using Firefox 115.15.0 ESR with a MAC M2

When I visit jsonviewer.stack.hu and paste data into the viewer I get the following error:

TypeError: netscape.security.PrivilegeManager is undefined

Please type: "about:config" in your address bar. Then filter by "signed". Change the value of "signed.applets.codebase_principal_support" to true. You should then be able to use this feature.

As config is sensitive area of the settings can you guide through this problem with a fix? Thanks bcoleman@sympatico.ca

Hi Firefoxians,

I need to ask regardining this security.cert_pinning.enforcement_level. how can i set this value using the windwos server GPO? i could not find this even after copying the firefox.admx file. could someone please guide me how can i acheive it?

I would really appreciate the help!

Regards Sheras

How to search for installed (both enabled and disabled) addons extensions in Firefox browser like chrome does via "chrome://extensions/" in 2025?

It is quite surprising that in 2024-25, firefox still doesnt have any option to search for installed addons via "about:addons". You can only search for addon site, not for those installed on your device and profile and browser.

Is firefox team really updating their browser for 2025 when compared to chrome?

So, There's this website called pw.live and I use it for study purposes. And I've recently switched to linux and installed firefox. But that website loads but any videos or live streams don't. Even though it works perfectly fine on Windows version of firefox.

I tried to search about this and it may be because the content is DRM protected. I'm just speculating though it may be broken for some very different reason. I also looked into solutions to fix DRM related issues. And found some solutions but the plugin Widevine Content Decryption Module provided by Google Inc. just doesn't exist in the plugins tab. There is only "OpenH264 Video Codec" there. And I think that might be the problem.

Thanks in advance.

Firefox downloads .ai files too often as .pdf files, which, although I can open in Adobe Illustrator and/or change the file suffix to open in Adobve Illustrator instead of it automatically opening in Acrobat (unless I right click into Illustrator), is a hassle and concerns me of unintentional file corruption. I don't know why Firefox is downloading .ai files as .pdf files, but it is impractical and frustrating. None of the file download settings I adjusted fixed the issue.

Is this a known issue? The only thread/question I found on this type of issue where files get downloaded as the wrong filetype/suffix was an archived question on .ddd files being downloaded as .pdf files. Please let me know if this is something the devs are aware of and can work to fix it.

What has happened to the "More actions" menu button - the one that normally is in the upper left corner of windows (see the attached image)?

I have just installed a new PC, with Debian 12 and KDE (plasma 5.27.5); the other windows have this menu button, but not Firefox and Thunderbird. Is there a way to get it back, eg by moving the menu bar out of the title bar and back to where it used to be?

Why is there in about:config no reference to documentation of the displayed settings?

e.g. browser.chrome.toolbar_tips.hide_on_keydown

What is it? What is the meaning of the values? What is the default value? Why do we have to guess?

It is probably documented somewhere (I hope). Why is there no reference to it in about:config?