Firefox Community Forum

So out of nowhere, I can't use the back button, or delete pages by clicking the 'x. I can't even click on the settings icon, or any icon on the menu bar. When I hover over any web page title, it shows a small window of it, but I can't get rid of it. I didn't change anything, so what's going on?

As the title says Firefox has stopped working for Mac a few days ago after the update. all I get when I open it is a blank grey box. My software is up to date and I have uninstalled and reinstalled Firefox multiple times, nothing worked. is there any way to fix this other than waiting for Firefox to update again? I just want to bring this to Firefox's attention so it can be fixed, I like Firefox it's my go-to browser to use.

I’m suddenly unable to open Mozilla Firefox at all on my Windows 11 Pro (version 25H2) Surface Laptop. The browser never launches - every attempt immediately crashes and opens the Firefox Crash Reporter.

I tried uninstalling and reinstalling a fresh copy of Firefox (and removing the old application files, though the original Firefox program folder has 13 .tmp files inside a “tobedeleted” folder that I can’t delete), but the issue persists. When I try to install or uninstall Firefox, I get the same behavior: Firefox never opens, and I end up with multiple instances of the Crash Reporter popping up instantly.

Tried renaming firefox.exe as well to no avail. Chrome and Edge are working fine.

I'm simply trying to email someone using the email link on their site.

The link is a mailto link which requires an email application (which I don't have). All I want is to copy the link to the clipboard.

Firefox lets me right click the link and copy the email address, but this doesn't allow me to provide the required Subject specified by the site's author.

I could have sworn Firefox used to have this feature. Netscape and IE certainly always had it back in the day.

I am trying to clear some out dated stuff off my computer to make some room on my dreive, and have discovered several older versions of Firefox, saved in a file, Can I uninstall them or delete them - I am worried that this might affect my newer version.

I use Norton Password Manager. I use Firefox most of the time as my main browser. I added the Firefox extension for Norton Password Manager when I got my new laptop, but it never does anything but hang when I try to utilize it. Today I finally turned off the extension and just ran the Password Manager as a new tab on the browser and had no problem with it running. However, it doesn't give me full use of the PM. (It does at least give me my passwords and user names, which the extension wasn't doing.) I keep notes with some of my passwords that are important to me. Using the PM on Firefox on this new laptop, I've found that none of the notes show up in the windows. Is there something I haven't turned off or on that's causing the problem I'm having? I use the PM on my iphone as well and have had no troubles with it. Thanks for any help. Sally 12/14/2025

When I try to sign in to a particular site FireFox gives me this warning:

"Your username or password is incorrect.

You can try again or skip the password by scanning the QR code on this page."

However, the user name and password ARE correct and I can log into the site with that username and password on other browsers like Safari.

Is there any way to fix this?

I haven't been able to find a keyboard shortcut for switching between FF windows. I'm using MacOS Tahoe. Is this in development, or is it there and I just haven't been able to find it.

In recent months, performance has dropped sharply and I have been unable to resolve using the advice in Help and seeking guidance. I attach the Troubleshooting Information, and a screen shot of me attempting access my Amazon account - 15 minutes and counting.

I have tried multiple options including:

• removal of 25% of software files
• removal of add-ons
• Firefox Safe Mode (no improvement)
• Following performance Troubleshooting guide (e.g. history, caches etc)
• Third Party software (CCleaner Pro) to check Drivers and Software (all up to date)
• Check of SSD Status (92% reported by Windows)
• Task Manager reviews

Seeking your advice and guidance on resolving this (now) painful experience.

Hi,

Following downloading update version 146, I have been unable to open Firefox, all that happens is that a box appears stating (see images): firefox.exe - Bad image, then C:\Program Files\Mozilla Firefox\xul.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support. Error status 0xc000000d.

After clicking OK on that box another one pops up stating:

Couldn't load XPCOM.

I have tried doing a Windows system restore, to try to take it back before it downloaded version 146, but this hasn't worked.

I've looked online and followed the advice there to download Firefox from your website, but that failed, just generating the XPCOM error.

My MAIN CONCERN at this point is that I do not want to lose all the bookmarks I had saved on my Firefox! I can't see any file within those in the Program Files\Mozilla Firefox folder, so is there any other way to save\recover them?

I don't have any original "installation media" so as far as I can remeber Firefox was pre-installed on my PC?

I have a Samsung PC running Windows 10. There are two Mozilla Firefox folder under my C:\:

C:\Program Files\Mozilla Firefox and C:\Program Files (x86)\Mozilla Firefox, under this folder the version is 146.0.0.383, but under the other folder it's version 145.0.2.579?

Please advise as to how to save my bookmarks and rectify this error.

Thank you in advance.

Robert

I have 3 devices connected to Mozilla account, 2 smartphones and 1 PC and NONE of them are syncing properly, bookmarks sync perfectly and everything else fails miserably. Some part of history does sync but nowhere near the full history. Syncing of open tabs is *completely* broken.

Hi everyone, I just set nice custom colors for the websites. Problem is, not every website looks good then, on some it gets messy. Is there and option somewhere to toggle it off, for particular websites, while still keeping the setting on for the rest of the internet?

Best wishes, Techno