Firefox Community Forum

I am getting constant pop up "alerts" on the right side of my screen that block my view. When I close one another pops up. It's very annoying. All of them have

the Firefox logo and name in the upper left corner.

Thanks.

FF 154.0 will not create a backup file. Trying to create an initial backup to my D: drive (2 TB Samsung 990 Pro M.2 Gen 4 NVMe SSD with 86% free space). WIN Pro 25H2 Operating system, Intel Core i7-14700K CPU; 64 GB DDR5 - 5600 MHz Corsair Vengeance DRAM.

No matter what I do I can't get the initial backup to complete even though the D:/Restore Firefox folder was created. I consistently get this message, “Hmm, there was a problem with the backup. Please try again in a few minutes.” The message result of browser.backup.backup-debug-info is:

{"lastBackupAttempt":1787153673,"errorCode":9,"lastRunStep":13}

TLDR - I have two profiles set up, but they don't sync across devices.

I have Firefox on my main computer and recently got a second computer. When I downloaded and signed into Firefox on the second computer I created a new profile so I could have different bookmarks, settings, etc. At some point I got signed out of Firefox on the second computer. When I signed back in, it didn't show any profiles - just my usual default settings. On the main computer it still shows two profiles, including the one I set up on the second computer. I have tried signing out and back in on both computers, and manually syncing data. The main computer still shows two profiles, the second computer still shows zero profiles (but has my Firefox settings/bookmarks saved as default).

Suddenly, I am getting unwanted ads every time I do a search or open another window on Firefox. It is extremely annoying and I have tried everything. This annoying practice includes even opening opinions/articles in the wsj. This, I believe, is outside what a browser should be providing. Popups that are unwanted and are part of the operating system is just not right. I am considering going to another browser as my default because of this intrusion.

The popup appears and when cancelled will reappear after some time then repeat.

This popup appears to have a mind of it's own and should only appear "on click" into a password request box.

This is very annoying and whenever it appears the page being used will not function until the popup is cancelled.

Hello Mozilla Support Community,

We are troubleshooting a cross-origin resource sharing (CORS) issue specifically occurring in recent Firefox releases when processing custom B2B appointment requests.

Setup & Context:

Our production application, Frontline Sales Consultancy (flsc.co.uk), triggers a client-side fetch request to an external CRM gateway.

The request works seamlessly on Chrome and Edge, but Firefox throws an NS_ERROR_DOM_BAD_URI during the OPTIONS preflight check.

Observed Behavior:

Firefox Web Developer Console shows the preflight request failing before headers are evaluated.

Access-Control-Allow-Origin and Access-Control-Allow-Methods are explicitly declared on our origin server.

Does Firefox handle strict MIME-type checking or preflight caching differently for custom HTTPS API endpoints?

Any insights into Firefox-specific CORS strictness or network console debugging flags would be greatly appreciated.

Thanks!

I've received notifications from Mozilla stating my Mozilla account was used to sign in. Info posted in email states it was Firefox on Windows 10. My city and state accurate. Day, date, and time is ok. I've been using windows 11 for some time now. How can i trust Mozilla, if they can not detect the right windows version?

Thanks. George K

linux, firefox, and duck duck go search engine---i want to stop picture in a picture. include every instruction like if i am to use the address bar, where do i find that?

I often get a Primary Password popup when it is not needed; I just delete the popup and open whatever I need. Worse, it asks for a Primary Password "password," but rejects the one I chose. I just want to get rid of the Primary Password without affecting my other stored passwords. Please help.