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Witam, chciałbym zgłosić bardzo nietypowy problem z przeglądarką Firefox na Androidzie. W nocy z 18 na 19 października (około 23:00–6:00) przeglądarka Firefox zużyła 49,6 GB danych komórkowych, mimo że telefon był zablokowany, a ja spałem.

Nie miałem otwartych żadnych kart wideo, nie pobierałem plików ani nie używałem aplikacji. W statystykach systemowych (Android, sekcja „Zużycie danych”) widnieje informacja, że:

dane w tle: 49,59 GB,

dane w pierwszym planie: 14 MB.

Wersja Firefoksa: 144.0 (Android) System: Android 11 RKQ1.200826.002 Telefon: Redmi K20 Pro Professional Konta Firefox są zsynchronizowane z komputerem. Nie mam zainstalowanych nietypowych rozszerzeń.

Załączam zrzut ekranu pokazujący zużycie danych.

Czy możecie pomóc ustalić, co mogło wywołać tak ogromne pobieranie danych w tle? Czy to mogło być np. błąd synchronizacji, cache lub jakaś aktualizacja PWA / service workerów?

Dziękuję z góry za pomoc!

Pozdrawiam, Tomek

Hello, I’d like to report a very unusual issue with Firefox on Android. During the night from October 18 to 19 (around 23:00–06:00), Firefox used 49.6 GB of mobile data, even though my phone was locked and unused.

There were no videos, downloads, or active tabs running. According to Android’s data usage details:

Background data: 49.59 GB

Foreground data: 14 MB

Firefox version: 144.0 (Android) System: Android 11 RKQ1.200826.002 Phone: Redmi K20 Pro Professional Firefox account is synced with my desktop browser. No unusual add-ons are installed.

I’ve attached a screenshot showing the data usage statistics.

Could you please help identify what process could cause such massive background data consumption? Maybe a synchronization loop, cache download, or PWA / service worker issue?

Thank you in advance for your help!

Best regards, Tomek

"This profile was previously synced to a different account To keep your data organized and secure, each Firefox profile can only be synced to one account. To sign in using xxx@xxxx.xxx, create a new profile."

So I deleted my old mozilla account since I abandoned the email that it was linked to, but when I tried to sync with my new account I get this. Is there anyway to do this without having to make a new profile?

I tried making a new profile and copy and pasting my profile into the new one, but still get the same pop up. I guess there's something in my profile that says it's been synced before, is there anyway I can find that and delete it or change it?

Old bookmarks not showing up in Firefox on new computer. It seems to merge all Edge bookmarks onto new Firefox on new computer. Is there away to get old Firefox bookmarks backed that were synched?

On my windows 11 machine, Firefox requires me to re-log into my Mozilla account every few days (there is a yellow triangle on the Account extension, which when clicked, has me to log into my Mozilla account). I have tried several troubleshooting steps:

1) Create a new profile and set it as the default profile 2) Completely uninstall and reinstall Firefox using the steps in the following article, including removing user data. https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer

I'm using Firefox on a Mac and my iPhone and I don't experience this issue. I am logged into my account on both devices.

Thanks,

Paolo

look, i have no idea if this is a bug, but i have been dealing with this for over a month now. i even have tried to use what was suggested, still does it. it all started AFTER i used mozilla sync, now for some reason it forces me out of my accounts every time i try to restart my browser, forces me to log back into them, then does it again if i close out mozilla at any point after to make sure it isn't about to sign me out another time.

it's getting frustrating because i am tired of losing my history, my bookmarks, and my extensions. this is also reaching a point i am considering changing web browsers because it won't fix after trying the suggestion given before of deleting the files.

I've ALL Mac. Desktop, laptop, i-pad, i-phone - oh, and I've got a Lenova for an exercise program that's in the mix. I can't seem to get any syncing done. I see notices that it's happened, but the tabs on none of the devices line up. I also tried syncing with/to/from my iphone. I got you QR Code and had to use the Iphone camera to scan it in. I got a message that I have to do it from within Firefox - but all I can get there is something KROLL. And that's an internet URL/page. I can't find a way to scan the QR code with that app hogging my screen. I've attempted to scroll/dump that tab but when I open up Firefox again...it's still there.

I followed the steps at https://support.mozilla.org/en-US/kb/sync-bookmarks-tabs-history-and-passwords-android

When scanning the QR code, my phone is stuck on this: https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-10-12-17-54-22-6b261a.png While my desktop shows this: https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-10-12-17-55-00-1c9ca2.png

When signing in with email on my phone, I get an "Unexpected error": https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-10-12-17-56-18-5c7b93.png

I've tried everything. I've cleared the app's storage and also re-installing the app. I've removed the old device login from "Connected Services" in https://accounts.firefox.com/settings.