Firefox Community Forum

I host a website, and don't want browsers (particularly Firefox) offering modified versions to others. Is there a header or something I can set webserver-side to disallow Firefox from offering the option?

This doesn't work:

add_header Cache-Control "no-store, no-transform, public" always;

Hello,

I'm writing because I’ve encountered an issue with the tab groups feature in Firefox.

Some time ago, after a browser update, I noticed a new feature that allowed me to group tabs thematically — I could name each group (e.g., "Study", "Work"), choose a color for it, and save and close groups to reopen them later. I found it very useful and used it a lot.

Last night, I decided to declutter my browser and closed several tab groups using the built-in menu. A bit later, I shut down my computer, but perhaps too quickly. This morning, when I turned my computer back on, Firefox was very slow to start. After a restart, everything seemed to work fine again, and the open tabs were restored.

However, all my previously saved (but temporarily closed) tab groups disappeared. In the tab group menu, I can now only see the ones currently open. I’ve searched through all the settings and history but cannot find any way to restore the missing groups.

Is there any way to recover the tab groups that I had previously saved and closed?

Thank you very much in advance!

The offline package download speed is too slow and sometimes fails. I hope it can be provided separately, like interface language packs, just as Debian has separate interface language packs.

After upgrading my 128 esr to 140 esr, some sites stopped opening. In regular versions, it has not opened for a long time. There are many such sites, for example, qwen3.app or temp-mail.io. It thinks for a long time and finally a message that the time has expired. Chromium is ok.

I was able to use it this morning from my macbook. But the afternoon I was on sites where my passwords usually fill but now everything is empty, everything had been deleted. I tried to log out and back in to mozilla and sync, but everything is gone. Over 100 sites and passwords. How this happened ? Where can i ask for help since Mozilla doesn't offer any.

What follows describes what I think is an annoying bug, and as I'm writing a draft of the bug report, I thought I'd post it here first to make sure it's understandable, and if possible to get others to confirm the bug.

In Tools - Settings - Files and Applications, with the following settings: - Always ask you where to save files is ON - What should Firefox do with other files? is set to Ask whether to open or save files

If a file type is not defined in the Applications list/grid, Firefox 140.4.0esr displays the Open or Save box (only Save for .exe files) If you click Save, FF opens a save window according —logically— to the path defined in Tools - Settings - Files and Applications - Downloads, so - The list of files shown to the right is correct, - But the path shown in the toolbar above it is wrong (> ComputerName > C:\ > in my case), - And the selected folder in the navigation column to the left is also wrong (ComputerName in my case)

and that always throws me off.

The bug appeared before FF v140.4.0

Test downloads - Go to https://openexr.com/en/latest/test_images/TestImages/AllHalfValues.htm and click the link below the AllHalfValues.exr title - Go to https://www.picsellia.com/post/tiff-tag-image-file-format and right-click on one of the pictures at the top, select Save Image as from the context menu.

Please post a brief message below to confirm or invalidate my finding. Thanks!

I joined a Microsoft Teams meeting through Firefox on the web on a Linux machine. When I tried to share my entire screen, I was asked if I wanted to share the entire screen in a Firefox pop up which I said yes. Then the "you are sharing your entire screen" came up, the sharing icon was red and the "stop sharing" button was red. See attached image. This all disappeared and reverted to the default state almost instantly.

Teams has a feature to "manage what attendees see manage what attendees see" where the meeting host can preview shared content before making it live.

I am concerned that the meeting owner was able to see my entire shared screen without me even knowing it through this preview.

Can someone help? Microsoft just sends you around in circles and I can't contact Mozilla.

Hello,

I'm facing an issue where my microphone does not work in Google Meet when using Firefox, even though I’ve granted all necessary permissions. This problem is specific to Firefox, as the microphone works perfectly fine in Google Chrome.

I prefer using Firefox because of its convenient screenshot features, but this microphone issue has caused major inconvenience during important meetings.

Kindly help me resolve this issue.

Thank you.

Secure Connection Failed

An error occurred during a connection to netbanking.hdfcbank.com. PR_CONNECT_RESET_ERROR

Error code: PR_CONNECT_RESET_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more…

this problem shows in the time of hdfc netbanking login time

what is the solution for this?

Regards, Mahesh

With FF 140.0 on both WIn10 and WIn11, new tabs opened automatically then closed after less than a second. Initially I thought this was due to malware, but on inspecting the History, I found the source of this annoying behavior:

// SidebarUtil.tab.js

// This is just a placeholder file to be loaded in a temporary tab to check if a sidebar is open and how wide it is.

Is there a way to STOP this sidebar checking with its tab opening/closing without disabling Java entirely ? Is this annoying behavior really necessary in FF ?

Hello everyone,

Is there any software that allows software developers to see what the CSS they are creating is doing in real time ?

Because I can't imagine they're doing it blindly. I see some CSS files that have hundreds, possibly thousands, of lines.

If there is software that helps them see immediately what their CSS is doing, can it be used to create extensions (add-ons) for Firefox ?

Thank you for your attention.