Firefox 커뮤니티 포럼

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.

Dear Firefox Team,

I’ve been a loyal Firefox user for years, and I generally love your browser. However, I recently experienced a serious issue due to how Firefox handles saved sessions, cookies, and multiple logged-in accounts.

I had two Gmail accounts saved in Firefox, both of which were at some point used to access Fiverr accounts — one active, and one previously disabled. During a session where I was logged into my active Fiverr account, my internet went down temporarily. When I refreshed Fiverr after the connection came back, Firefox reloaded a session that appeared to be linked to the disabled Fiverr account — even though I never intentionally accessed it.

As a result, Fiverr’s automated system flagged my active account for being "connected" to a banned one. This has had a direct negative impact on my freelancing career — my account was permanently flagged, and I lost access to valuable clients and my work history.

I understand that session management and cookie handling are standard browser features, but I want to highlight how important session isolation and protection from unintended auto-logins are, especially for freelancers and remote workers using platforms like Fiverr, Upwork, and others.

Please consider offering better controls or clearer separation between accounts (e.g., warning before auto-loading saved sessions, stronger isolation per Gmail/Fiverr session, or more powerful multi-account browsing containers by default).

This small technical behavior has led to a major professional loss.

Thank you for your work on this browser, and I hope you’ll take this feedback seriously to help prevent this from affecting others in the future.

Sincerely, A frustrated (but still hopeful) Firefox user

– Ehsan, Freelancer

YouTube videos encoded at 60 frames per second are extremely choppy in Firefox only. Microsoft Edge plays the same videos perfectly.

I have deleted my profile and reinstalled Firefox, updated graphics driver to the latest version, and toggled hardware acceleration on and off. Nothing helps.

HI I cannot add an additional tab on top to open. I usually had no problem I need to open 6 to 8 tabs a day for work. Did firefox add a new version? every time I open an additional tab it closes the one I have open.

I don't know what happened is this a new version opened in fire fox.

Thank Linda

When using Firefox in fullscreen mode (via F11) on Windows or Linux, moving the mouse to the top reveals the tab and address bar. but this causes the page content below to shrink temporarily.

In comparison, Chromium-based browsers handle this differently: their tab and address bars appear as overlays, without disturbing the layout or causing any viewport resize. This results in a more immersive and fluid fullscreen experience.

Please consider implementing a similar overlay behavior in Firefox's fullscreen mode, or at least providing a toggle via about:config to allow users to choose between current behavior and overlay-style tab reveal.

Hi community,

Since the last Firefox update, I’ve noticed that many websites load as a blank white page on the first attempt. The only way to get the content to appear is by refreshing the page manually (Ctrl+R).

This happens randomly on both static and dynamic websites — sometimes even on Firefox’s own support pages. I’ve already tried:

Clearing cache and cookies

Disabling all extensions

Running Firefox in Troubleshoot Mode

But the issue still occurs. No errors in the console either.

Is this a known issue with a recent update? Or could it be related to hardware acceleration, DNS, or caching settings?

Would appreciate any advice or similar experiences!

Bonjour, Je veux modifier ces sites webs recommandés. Des "top sites" ça s'appelle je crois. J'ai regardé sur le net mais j'ai pas vu comment les modifier. J'ai par exemple, pas besoin de Le Monde ou de Reddit. Cordialement, Un utilisateur

lousy, messed up , outdated bookmarks. What on earth are you thinking? RESET my original bookmarks, AND their personally preferred arrangement. This debacle forces me to hunt for everything, because it isn't where where I left it. Please restore my original bookmarks, not this disarranged mess, and thanks for the extra frustration and anguish.

For some unknown reason on my Mac computer the forward and back browser arrows have moved to the right extreme side of the browser and have also revered ie > < I'm guessing something in settings has been changed accidentally.

Can some please explain to a seventy year old man how to move them back to the left side of the browser and in correct order ie < > where they belong?

Best Regards, WG

Hello! I am an avid user of firefox (especially with adblockers) on a windows 11 PC. Unfortunately, I have recently been experiencing an issue where when I attempt to open firefox, a window will open for a split second before instantly closing again. My PC is up to date, I have tried refreshing firefox and doing a clean install, but cannot seem to overcome the issue, or even open it in safe mode. Does anyone have any advice? Many thanks in advance!

Like the title says.

I used to have a Pocket icon. Yes, I know it's going away.

I'd like to use the TenTabs icon. Where is it?

And if you tell me it's on the "Customize Toolbar", I can tell you that, no, it is not.

Help?

After updating to newest Firefox 140.0.2 (64-bit) does all PDF attachment stop working it doesn't offer to save or open them as it used to, we tried sending a Doc document to the email and it will download them and open them so it is only PDF files.

I tried new profile with blank slate on her PC.

OS: Windows 11 Have Bit defender security and Malwarebytes

I also tried on my PC logging into the work email as neither me or wife use Apple and same problem PDF attachments will not open or work.

I didn't create a new blank profile on my PC.

My PC: Windows 10 Enterprise Have same Bit Defender security and Malwarebytes

It worked in 139.0.4 for her, but downgrading is not a option as if I read the downgrade page right it will make a new profile making her loose the profile she is using now.

Do anyone have any ideas why after the update does Firefox now not open PDF Attachments, we tried Edge and it work fine there, if she forward from the work email to her private which is a gmail account she can open the PDF files, but that is not a good way of doing things or acceptable as it is work emails sent from companies her boss work with, he is a car mechanic with his own mechanic business.

Please tell me what details you need from me to help her find out why it stopped working or anything else I can try.

The Work place is just her and her boss plus 1 employee so I help with the IT on the work computer so I need to find out why this update stopped PDF attachments from working.