Firefox 社群討論區

I rarely turn my laptop off, when I'm not using it I put it into sleep mode. Firefox absolutely hates this though, and after a few days it will slow to a torturous crawl. Everything becomes horribly irresponsive, feels like nails on a chalkboard. It can even get to the point where it will randomly delay my cursor in Windows 10 itself by 10 SECONDS along with some bleed into other programs while switching between them. Fully closing Firefox then re-opening it will reset the issue, starting the timer again, but I hate doing this because I have doing that set to log me out of various sites which I then have to re login to, letting the torture boil until I give in. This has been my Firefox experience on laptop for at least 5 years now. Other forks of Firefox have this same issue.

I am leaving Firefox in the torture state currently to troubleshoot here. Currently the memory usage on Firefox is 6GB at 54% of my total ram, which is being used at 84% total. Total CPU usage is 23%. Wrote this on my desktop for my sanity so that's why there's no troubleshooting information.

I've just upgraded to V149 and, when using NordVPN, Firefox is now taking at least 30secs to startup. If NordVPN is off startup is instant. Prior to V149, Firefox startup was instant, both with and without NordVPN.

Places where I've observed this behaviour:

• The 4th video in the description of https://store.steampowered.com/app/1363080/Manor_Lords/ (ignore the media carousel at the top of the page)
• This video https://dolphin-emu.org/m/user/blog/progress-report/2603/rebelstrike-texturestreaming-av1.webm that's loaded in an embed at https://dolphin-emu.org/blog/2026/03/12/dolphin-progress-report-release-2603/

When these videos are in view and playing, they're decoded using the CPU and the browsers frame rate tanks (heavy/laggy scrolling when scrolling with mouse scroll wheel), I have a Geforce 3070 which includes support for AV1 decoding so I'm not sure what's happening.

AV1 videos found on Youtube like https://www.youtube.com/watch?v=foqVJq-XPTg are fully hardware accelerated by the GPU (Stats for nerds confirms it's playing an AV1 copy) and doesn't exhibit any performance issue.

GPU usage is monitored by Task Manager in Windows 10. For the problematic videos the GPU Decoding is at 0% with a workload being spread across many of the CPU cores. For the non-problematic 4K video the GPU Decoding is around 60-70% and no workload is distributed across multiple CPU cores.

Youtube playback causes Firefox to freeze up. Just the tab that is playing, not the entire browser. I have reinstalled firefox, used recommended settings and I have no addons or extensions. Other browsers work fine and there is nothing wrong with my computer. It is only firefox. This has been happening for about a month now.

I get REAL tired by the amount of resources Firefox eats up with each open window. For whatever reason, having multiple windows open prevents Facebook from loading. I'll get 1 story and a "shorts" bar but THAT'S IT. Even clicking the story to rate or comment does nothing. If I start to delete windows; it will decrease the memory usage and then it will open.

However, I DO NOT WANT TO CLOSE MY WINDOWS IN ORDER TO OPEN FACEBOOK! Firefox should not be eating up that many resources. The open windows are of text and/or picture archives. There is no sound or video playing in the multiple windows open. My system literally has 128 gigs of ram memory so it seems very odd to me that Firefox is using between 11-13% with nothing running in the 15 windows I have open.

Hi everyone,

I’ve been experiencing performance issues while using Mozilla Firefox, especially when working with browser-based tools that handle file processing.

When I try to upload or process larger files (like PDFs), I notice the following:

• Firefox becomes slow or laggy • The tab sometimes freezes temporarily • File processing either takes too long or doesn’t complete • Occasionally I get a “page unresponsive” message

For testing, I used an online tool: [ONLINE EDITOR]

The issue seems more noticeable with larger files or when multiple tabs are open.

What I’ve tried:

• Restarting Firefox • Clearing cache and cookies • Disabling extensions • Testing in Troubleshoot Mode • Updating Firefox to the latest version

The same tasks seem to work slightly better in other browsers, so I’m wondering if this is related to Firefox performance or settings.

Question:

Is there any way to improve Firefox performance for heavy browser-based tasks like file processing? Are there specific settings I should adjust?

Thanks in advance!

Firefox has definitely gone downhill imho. Too many very frequent updates after browser slows down to a virtual standstill. I have seriously been looking at other browsers. What's the story?

I am not sure if you have herd this or not since the newest Firefox update everything is very slow. takes forever to get anything on Firefox especially with extensions enabled. Especially Facebook . Now i am not sure if this is Facebook's fault or if it is Firefox Iam using this version149.0 64 bit. if it is not Firefox have you hear d or seen yourselves about Facebook not loading correctly . Please if anyone knows of either problem feel free to contact me

Have used Firefox for years, always do current updates. Still using Win10. After browsing for a few minutes, hard drive activity increases and the mouse and keyboard become unresponsive, returning very briefly for a second or two, before once again being unresponsive. After 10 min. or so, system returns to normal. This only happens while using Firefox. MS Edge, with all the same extensions, has no problem. Have searched many times, but no useful help is found. Have already un-checked hardware acceleration, and cleared caches, Am ready to give up and switch to Edge. Any help?

When i start to use Firefox and browse internet, usage of ram memory slowly rise up to max, using 5-10 GB, i disabled AI, same problem, don't know if something with Youtube causing this, every open tab is consume too much of ram memory. I think it started yesterday or day before. Installed again Firefox, same problem, if i have more open tabs, quickly rise consumption or ram, i have 16GB. Now 4 tabs, FB and 3 Youtube, more than 5.6BG. In Task Manager shows Firefox (20), 20? only 4 tab open and ram rises.

I use Brave, Firefox, Firefox Developer Edition and Thunderbird. Brave: 600mb Firefox Dev: 600mb Thunderbird: 200mb Firefox: 800mb Why is Firefox using too much memory? Especially as I am running Firefox Dev as a direct comparison. I don't have any plugins on Firefox. Firefox Dev has uBlock Origin alone. Brave has a few plugins.

Hello all,

I've been a long time Firefox user and recently (starting about 2 months ago) started seeing some irritating behavior while browsing. Firefox will at random intervals "gray out" either while interacting with specific webpage elements, or browsing specific websites. An example of this "gray out" condition is included as a screenshot. The browser will flicker between this "gray out" condition and the webpage, occasionally staying in the "gray out" state for 3-6 seconds. As you can see in the screenshot all Firefox UI elements are also missing, so this seems to be broader application issue. I've noticed this particular issue repeatedly on Amazon.com while moused over product photos.

I consider myself a power user. As for my PC, it is running Windows 10. All graphics drivers are up to date. Other apps run normally. I've never had any problem browsing/interacting with similar web content in Microsoft Edge... but I heavily prefer to use FireFox. Has anyone else encountered an issue like this?

Hi Everyone,

I’m Harmandeep Singh Kandhari from India, A Health and Wellness Motivator and Now, Recently, my Mozilla Firefox browser has started using much more memory than usual, and multiple tabs cause noticeable slowdowns. I haven’t installed many new extensions. What steps can I take to identify the cause and optimize Firefox performance without resetting my entire browser profile? 🦊💻

Thanks, Harmandeep Singh Kandhari

warum ist die obere zeile mit dem kreuz beim start nicht mehr da? Sieh die markierung im Bild! immer wenn ich firefox starte mus ich es erst nochmal minimieren und dann wieder öffnen. was soll der scheiss

und Könntet ihr eure hilfe auch mal auf deutsch machen dann könnte mann wenigstens was lesen ode alles extra übersetzen zu müssen

What causes Firefox to freeze when two video windows are opened, i.e. in a new tab, the video windows immediately start to freeze? I use Windows 11. Other browsers work fine, only Firefox freezes with two windows open.

Hi, I’ve noticed that Firefox often uses a lot of memory when I have multiple tabs open, even more than Chrome or Edge on the same number of tabs. Sometimes it slows down my system or makes switching between tabs laggy.

Is this normal behavior, or is there a way to reduce Firefox’s RAM usage without losing performance? Are there specific settings, add-ons, or troubleshooting steps I should try?

Thanks in advance!