Firefox Community Forum

When using any Microsoft 365 product on the browser I keep getting a prompt to "Please sign in" although I am already signed in. I can click the Sign in button and a about:blank page pops up for a split second. Then within a half hour or so, it will pop up again. I deleted my cookies but the problem still persists. Does not happen on other browsers.

Hi - Firefox placed an 'Old Firefox data' folder on my desktop and I am unable to delete it. I'ver tried third party apps, logging in as administrator, command line delete, uninstalling FF but am still stuck with it and my network settings are wrecked so I can't re-establish connection to the internet on that machine. Anyone with any suggestions as to how I get rid of the 'Old Firtefox data' folder ? Many thanks...

Firefox stopped working on my computer. Every time I try to open it I get an error message that says "Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item." I tried to uninstall and reinstall with no success. Our IT dept tried as well and nothing we have tried has resolved the issue. Thank you for your help.

Hi,

Not sure if anyone else is reporting this but ever since the last update - 140.0.2 Firefox Release, June 27, 2025 - many of my general sites, yahoo, news, company sites that I use everyday, do not load. I have to use Private Browsing, keep refreshing or change URL for the site to load. Anywhooos, I do appreciate you guys! keep it up!

Hi Firefox Team,

Why suddenly today there's no PDF preview for all PDF file sent or received on browser (i.e whatsapp web) Attached latest screenshots

Please assist.

Regards, Novie

In Chrome, for example, if you type "maps" in the address bar, it will autofill to "maps.google.com", which then redirects to the correct URL, "google.com/maps". Initially, it doesn’t do this, but if you do it repeatedly, Chrome eventually learns and sends you directly to that URL when you type "maps". The same happens with "gmail" or even just "gm", which redirect to "gmail.com" or "mail.google.com". Does Firefox have this kind of feature?

I think I browsed a reddit thread from a few years ago asking this same problem having something to do with autofill frequency which doesn't work, because the actual url is not, in the example of maps, maps.google.com and the url I want to enter redirects to it.

It would be cool if you guys added a display to control the volume of a certain tab (like YouTube that people often use to play music while doing other things) AND add a feature that when a new media starts playing it stops the other one (like on Opera GX, the browser I came from). This would be really helpful and immersive since the user wouldn't have to deal with sounds collision and focus on his thing, not interrupting his flow to mute a music or a podcast or whatever. Also if you guys could add this feature, let the users choose between two options: pause (which completely pauses the background media) or fade-to-mute (which quickly fades the background audio until it is completely muted, but not paused. When the principal media stops playing, it will fade in again).

With vertical tabs and expand on hover, clicking on the X box rarely closes the tab. Sometimes I have success if the pointer is on the left or right line of the box. Not having luck on the center of the box. Has been true for several weeks. With hover off, clicking the X works fine. I am running Windows 11.

Had to reinstall firefox after a power outage. Now running FF Version 140.0.2, 64-Bit. But I can't find Outlook Calendar. Calendar continues to operate as normal on my iphone running Outlook for iOS. How can I get Outlook Calendar working again on this desktop. Thanks in advance.

All of a sudden, I cannot login to my QNAP nas to perform any administration.

First it issues a self-signed certificate error. Then it issues a MOZILLA_PKIX_ERROR_CA_CERT_USED_AS_END_ENTITY after I've imported the certificate into the Firefox internal CA.

I am completely locked out of being able to manage my NAS because of this issue. I could issue another certificate, but, I can't actually install it. I could update the software in the unit to see if QNAP has fixed this issue, but I can't get into administer the device at all.

You people need to allow users to over-ride security concerns where errors such as this occur. The whole purpose of security exceptions is to prevent this kind of stuff from happening.

Please help and please give your users a way of managing this situation.

Starting this morning Firefox is not letting me log in to some pages. Other pages i can get into but they do not display/load properly. Everything was working fine on Friday. What changed?