Diễn đàn hỗ trợ Firefox

Firefox comes up in a large window, covering most of my screen. I can resize the browser window just fine, as expected. However when I close the program, then open it later, the browser window is not the size and position it was in when I stopped the program last, it comes up with a large window again.

I asked on 11 January 2026 Help for finding back my cookies. Got an answer by e-mail, but this disn't help to find my cookies and so I cannot manage these. Who can tell me please where I can find all my cookies? Thanks in advance. Regards Theo Koeppen

Hi there,

I recently received notice of being a part of the one billionth data breach and I am officially sick of it. I love and use firefox and beta, but I know my privacy is not that protected. I was looking through reviews and found Waterfox which is supposed to be built on the firefox platform, but has better privacy protections. I downloaded it and all seemed right. I imported from Firefox. Then I tried to download it to my iphone and the only thing that came up was "Water Fox". I downloaded it and couldn't even get through opening it without crazy ads and it looking like some game app. It wanted my saved data from firefox to import. But, no way. Either this was pretending to be WaterFox and a scam, or WaterFox IS a scam. So, I'm hoping maybe someone here would know and would also know if I just made a huge mistake by installing this. If it were just an app pretending to be WaterFox, why wasn't there an actual waterfox app? That was the only one even close. And, the reviews said that WaterFox was students working with Firefox or something like that, but couldn't find anything about them in Firefox forums. Any info would be greatly appreciated. And, if I did just make a huge mistake, is there a way to fix it? I didn't sign in with the squirrely iphone app, but I did with the desktop. Eeeep.

Locking this thread as duplicate, please continue here: [/questions/1571294]
سلام! 👋 با توجه به تصویری که فرستادی، اینجا دو تا کادر داری:

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✅ کادر اول: Summarize your question

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این متنی که الان نوشتی عالیه، همون رو میتونی کامل کنی:

When I play YouTube videos in Firefox, they are constantly choppy and laggy.

اگه خواستی کاملتر باشه:

YouTube videos are choppy and laggy in Firefox even though other browsers work fine.

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✅ کادر آخر: How can we help?

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اینجا میتونی با جزئیات بیشتر بنویسی، مثلاً:

When I play YouTube videos in Firefox, they are constantly choppy and slow, even though my internet connection is fine and other browsers (like Chrome) work smoothly. This happens with both HD and lower quality videos. I've already tried clearing cache and disabling extensions, but the issue persists. Please help me fix this.

I am on Windows 11. Asus laptop PC. On Google Chrome, any streaming website I used with autoplay enabled would KEEP full screen mode ON after changing episodes. It would automatically go to a new page with the following episode and remain full screen. Why doesn't Firefox have this feature?? I'm seriously considering going back to Google Chrome for this one small feature. Every time I had any streaming service playing with autoplay enabled, I didn't have to manually select the full screen option every time. I am having to stand up and manually click full screen function. Every. Single. Time. This needs to change PLEASE.

I am signed up for Mozilla Monitor but not for Monitor Plus. I received notification that the Monitor data broker scan will end on December 17 so I want to take action before that date on the scan results I have received.

When I browse the list of Profiles and expand the individual items (via the down arrow), sometimes I see a button labeled "resolve exposures" and most other times I do not.

Why is "resolve exposures" option so infrequent? When that option does not display, how do I remove the profile?

I keep receiving a popup seeming to be from McAfee security regarding a virus on my computer. It isn't from that security firm. The ad locks my system till I shut off and restart my computer. This is very annoying and occurs on all installed browsers. Is there anything I can do about this annoying thing?

According to my settings, Firefox should clear the cache completely. Bur it is never fully cleared, there are always about. 9.3 MB left at the temporary data. It should be 0 MB. Even clearing the cache "manually" does not clear it completely. HOW CAN I CLEAR MY CACHE COMPLETELY? (Firefox / Windows 11)

See two attached Screenshots

Firefox doesn’t spell‑check in Copilot because Copilot uses a modern custom text editor that Firefox doesn’t recognize as a normal typing area. Since Firefox never turns its spell‑checker on in this kind of editor, nothing actually fails, so there’s no error code or message. The spell‑checker engine simply never activates. For this to work, Firefox would need to update its spell‑checker so it can handle newer web‑based editors instead of only traditional text boxes.