Firefox Community Forum

For the last five days I've been unable to login to a particular site unless I clear the cache EVERY time I want to login. It's a site I've been using for many years but now I just get a message saying 'An error has occurred. Please try again later.' When I try later, the error still exists. I don't get this error message when using an alternative browser, but I don't want to do that. It's also the only site I'm having issues with ....................... which is strange. The site in question says that I'm the only one facing this problem. Any thoughts?

I have used Firefox as primary browser on my Mac for many years — never Safari.

Until yesterday, I used Safari as the only browser on my iPhone.

I now see all my Safari bookmarks in the iPhone’s new Firefox browser, but not the important open Safari tabs.

How can I sync my iPhone Safari web page tabs to Firefox on both devices, and sync the Mac’s open Firefox web page tabs to iPhone Firefox?

When I open Firefox I get a large number of warnings. I have run three separate scans (Norton, Malwarebytes, Spybot S&D. I have then restarted my PC and these messages re-appear.

The essages state "Warning: Virus detected" "System Alert!" "Trojan Detected!

The messages try to lead me to watrixa.co.in to Scan & fix or remove the viruses. It will not let me close these warnings.

I have been a subscriber to Firefox for a number of years, while using a different proprietary VPN. I changed my VPN service to Mozilla VPN a few months ago paying a an additional fee for the service. I learned shortly after that Firefox had a built in VPN and sometimes it appears to me as if that's what I'm using. Question: Is "Firefox built-in VPN"the same program /service as "Mozilla VPN"? Should I in fact have paid an additional subscription fee? If so, I do not seem to have a record of the terms of this fee and how often it must be renewed. Could you please clarify this situation.

Recently I had to install a new windows, and I signed in to my Firefox account and found all the data from the previous windows including the open tabs, I could find them from "Tabs from other devices".

But now can't find them any more, although that device name is still there in my account page, under " connected services", please advise.

On two different Windows machines, current Firefox (153.0.1), the alt-d shortcut stops working: it does nothing until I restart Firefox. Then it works again for a while. I've tried about:keyboard and it's not reset there. I tried all combinations: Clear, Reset, setting it to alt-d explicitly. None of those worked. But when I set it to alt-a, that worked--but then resetting back to alt-d again didn't work. That shortcut is muscle memory at this point, so it's quite distressing. Not sure what diagnostics might be available to help here, happy to try anything.

Full disclosure: Both machines are Windows 10 but since that's stable, I find it hard to believe that's related.

When there is a field to fill in my credit card info, the info will appear and let me select the CC I want to use but when I move away from the field the CC info goes away.

My firefox has been acting weird all of a sudden. Usually when I open firefox it loads all my tabs of the previous session and prompts me to enter my master password. But now when I start firefox, it opens for a brief moment and then instantly closes again. When I open firefox again all I get is a new empty window without any tabs, the password prompt also doesn't appear. So I have to manually open my last closed window to get the old window with all the tabs back (so I guess the window that closes instantly was the proper one) but the master password prompt won't show up. I can't access all my saved passwords in the password manager since I'm expected to sign in but when I click on "sign in" nothing happens - I guess the master password dialog just doesn't show up blocking me out of it. The only solution I have found so far is to go to about:support and clear start-up cache data. When it reopens afterwards I get the working window back, with my saved tabs and the master password dialog shows up - everything works. But it only works for this session, when I reboot the computer I have to do the whole issue again. Opening it in safe-mode also works but I need my addons and since it starts after clearing startup cache I don't think the addons are to blame. It just happened all of a sudden, I didn't install any updates or new version prior to the error.

Can anyone please help me? :(

my tabs bar, containing several hundred tabs, in firefox has suddenly decided to disappear and i can't get it to show. same for the menu toolbar (the one w/ the open, save,...) never really know which toolbar i am looking for. using latest version of ff and windows 11 desktop tried to get info directly from mozilla, but is the only place that probably has the answer.

what ever happened to support for the browser? it was relatively easy to get to the support area but now it mostly shows self-advertising for firefox.

thanks in advance for any help on this matter!

wolfgang

I just purchased a Keychron Q1 MAX keyboard. To customize the keyboard you need to use the online Keyboard Launcher (https://launcher.keychron.com/). That website says that only Chrome, Edge & Opera are supported if you're using Firefox.

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'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

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!