Firefox Community Forum

Odd behavior of tabs, including the following:

1. While trying to access content on a page in an open tab, an existing tab inserts itself in the first tab (left-most) position

2. While trying to download a standard pdf file the save windows opens but does so on top of another, irrelevant tab.

This happened also in Troubleshooting Mode. It happened today for the first time, but it's not happening all the time. Just every so often.

None of this happened in the version prior to 149 (ver. 148.xx)!

I'm using Tab Reloader, and have been using it without a problem for a long time.

Would greatly appreciate your advice!

J

Bonjour Je suis "harcelé" par des notifications (cf fichier joint) qui m'annonce, un virus detecté, un cheval de Troie, une alerte système, une erreur critique... en m'indiquant toujours via d75ag1anaffc73bd3jj0.jhec-defender.pro J'ai beau cliquer, je n'obtiens rien sauf assez souvent une connexion à Avast (qui n'est pas installé sur ma machine !) et qui me détecte aussitôt de 3 à 5 virus... mais qui ne être supprimé que par une version payante d'Avast Réelle menace ou publicité agressive ? Comment se débarrasser de cela sans bloquer toutes les notifications de Windows Defender ? Cordialement

Sorry folks, this is really confusing for me and it kind of snuck up on me like fading breaks on a car.

"This" computer is my main one and I use it the most.

I load youtube and get the usual list of suggestions. If I moved my mouse over any, they would start to play and I would "preview" them on that screen. I could select if I wanted the audio and subtitles.

All was good.

Fire fox has updated and the O/S has also over time and "recently" the "preview" stopped. (Oh well. Such is life.) I didn't think much of it.

Then the other day I was on ANOTHER machine (different O/S, similar/same plugins) and loaded youtube just for the sake of it and as I moved the mouse over the clips: I got the "preview".

I've shared the data from this machine. Kind of difficult to do it in/on THIS post from the OTHER machine also.

For clarity: It used to work. I didn't change any settings in any of the plugins/addons or FF settings. They were "working" as I wanted and so there was no reason to change them. I am guessing this is a "easy thing to fix" but the specifics of what I need to do is beyond me at this point.

I'd appreciate some guidance in how t find the difference between the two machine's settings so I can get the preview to work again.

Just to put it out there too: I have a "squillion" tabs open. They all seem to work and unless I really get carried away with things, Firefox 95% of the time behaves itself. Now and then it "locks up" and stops responding. The best solution is a total reboot and restart.

Hi, I've just seen the new Firefox VPN option, and while having a integrated VPN into the browser may be handy, I was curious as to where the servers/exit nodes where situated. Also, a nice feature to add would be to display where our current exit node is located. Best regards, D.N.

I am trying to pay a bill to ceyouny, for a seminar I will be attending online. Instructions indicate I can pay it by my VISA card or by PayPal. I hit the icon to pay by credit card. I involve Firefox, believing, from the instructions, that is how to authentic myself with PayPal for using that card. and am shunted into PayPal. I enter PayPal, using my PayPal password. To authenticate myself (?) I take a photo of a square code and enter a number sent to my email. I am now, as a result, involved in this interaction with Firefox, I don't know if I am in the right place, or what to do next. Can you help me?

https://ctrk.klclick.com/l/01KMZG91KPY8CEHDRNSDKGDC8A_1

Above type of links take me to "server not found." I would like to get to the correct link.

Dear Sir, I am trying to set up firefox browser.I have received a notice 'your new profile is good to go' I cannot see what I should do next.Please advise. Many thanks Roger Dace

I am a big fan of the new VPN feature that you guys introduced that is strictly for browser. There are only two current issues i have with them and its the limited bandwidth of 50 GB that is very low and i would like the option to pay a reasonable price for unlimited. Also when i disable the vpn for a website there is a blue pop up in the corner every time i tab over or open the specific page on a new tab that i can't disable or change the behavior in any manner.

I was on a website for Met Opera, buying tickets and suddenly a widget appeared on the lower left corner that says: Opt-Out Signal Honored. Not only did I Opt Out, but I no longer can navigate the website, and there is no visible way to cancel this. Please help. It does not appeaer on other web pages, or other browsers. What is this? I've tried locating it in settings, and settings does not have that privacy option checked. How can I remove it? thank you, Anne Marie Mascia

When I enable the firefox built-in vpn I have an error: "The proxy server is not found

Firefox cannot connect to the server at accounts.firefox.com What can you do?

Try to connect to another device. Check your modem or router. Log out and reconnect to Wi-Fi."

Thanks.

for context: my laptop was working/running completely fine last night, as of about midnight (east coast). booted it up around noon today to see that it was super slow and kinda laggy (this is a windows problem, not a firefox one, don't try and fix that, i know it sucks), and that if i restarted/shut down, it would automatically update (not what i wanted). when i did finally begrudgingly restart my laptop, it auto-updated as windows does, and i expected to open up firefox and go on with my day.

unfortunately, it prompted me to make a new user. and when i signed into my firefox account, it treated the browser that i have used for at least 8 months like i had freshly downloaded it. all of my history on here is gone. all of my bookmarks are gone. when i connected my phone to try and sync from what i had left before i updated, all my sync information went down the drain and is completely gone as well. i really don't understand what went wrong here, and i'm honestly devastated that all of my work and my history has to be painstakingly rebuilt.

if anyone has any idea of what happened here, it'd make me feel a little better and try to avoid it in the future.

So, today I found that absolutely all of my tab groups have been wiped from existence. Not passwords, bookmarks, history, extensions or anything of the sort. Just tab groups specifically. Everything else in my profile is still here. I tried restoring from a backup using the Session History Scrounger at https://www.jeffersonscher.com/ffu/scrounger.html but my closest backup was a March 26th one that is missing an entire tab group created after that date.

I tried searching other solutions to my issue, but nothing has worked so far. It doesn't have anything to do with updates as the last one happened on March 26th and I definitely used the tab groups after that point. I'm at a complete loss on what I am supposed to do, as I lost ~600 tabs combined across all groups

Hello, I'm French and I'm not very good at English I’ve been a Mozilla user for many years and am very satisfied with it. I’m having trouble interacting with the Ohm Energie website. I wanted to sign up for an electricity plan. The Ohm Energie page opened fine in my browser, but as soon as I tried to interact with it—for example, to request a quote—I received the following security notification: “Firefox has detected a potentially serious security issue with espace-client.ohm-energie.com. Someone impersonating the site might try to steal things like credit card information, passwords, or email addresses.” I was forced to use Chrome to sign up for my plan. I’m not the only Firefox user facing this issue. I called Ohm Energie and was told that many other customers have also encountered this problem. I’d like to be able to access my Ohm Energie account via Firefox—what can I do? I should mention that I’m not very experienced in resolving this type of issue. Thank you for your help

When I have set the size of the window and then move the window to the left or right then the application automatically expands the window. I do not want it to do that as I want to be able to have the firefox window where I choose and the size I have chosen, but the program automatically expands the widow to fill the screen.

This has worked fine in the past, and works now in Chrome, but not Firefox. URL is https://outlook.cloud.microsoft/mail/?bO=1&msalAuthRedirect=true&sessionId=20fbbbb0-2fa6-4848-8fec-c20c6d3a8be4

Here's the error message

UTC Date: 2026-03-30T12:16:32.476Z Client Id: 05099EAAAC364C6EBD8115436A25F2D9 Session Id: 20fbbbb0-2fa6-4848-8fec-c20c6d3a8be4 Client Version: 20260320002.06 BootResult: fail Back Filled Errors: Unhandled Rejection: SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data:undefined|undefined:undefined|undefined:undefined|undefined:undefined err: Error: 401 esrc: StartupData et: ServerError estack: y@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.06b8e674.js:2:299099 165332/E/<@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.06b8e674.js:2:23542

st: 401 efe: BL0PR02CA0036