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Lately, after last firefox update, whenever I start Firefox, it loads normally but when I click to open a website it freezes with a not responding message. I have waited for 10 minutes before and never responds. Even opening in troubleshooting mode it won't respond.

I started noticing my browser was running rough, and I tracked it down to Youtube, but only when I have a video in fullscreen. It doesn't appear to be affected by the codec, av0/avc/vp09 all suffer from it.

Incognito mode (no extensions) is still affected by it, but a separate profile + troubleshoot mode are not. My RTX 5080 is showing about 2% usage when playing a video, 0% at idle.

How do I nail down what's causing this?

Whenever I have to restart my cpu, the menu bar appears to try to open all of the tabs and it causes system hangups and says that Mozilla Firefox is not responding. What causes this ??

Not sure if this is a Firefox or YouTube bug.. it's really annoying and happens quite a few times each day I use my PC.. Is there any solution to this or perhaps reverting the update til this is resolved? I usually wait fo rit to stop lagging or if I'm not patient enough.. I'll just close Firefox entirely and re-open. Thanks.

For the last couple of days, the Firefox instance goes black and the title bar turns to an old windows look (see picture). Or turns fully blue, the color of browser theme, and the title bar is covered as well. There is no certain page that makes this bug appear, it appears randomly regardless of the page I'm visiting. Often it happens on the Firefox instance that is on the monitor I'm not working on at that moment. For example, I am browsing on my main monitor, and the 2nd monitor has a page open, the page in the 2nd monitor becomes bugged. It happens the other way too. Current Firefox version is 149.0 64 bit version, but i think it happened before the update too. I have already tried to turn hardware acceleration on and off again.

在 Firefox 内部：

通过 JS 触发的新页面 通过 a.click 触发的新页面 甚至 rel=noopener 都会被标记为：

“related browsing context”

进而共享同一个进程，新页签因为内存占用过高，导致旧页签卡死。

通过设置

1. 添加 COOP 响应头 add_header Cross-Origin-Opener-Policy "same-origin" always;也无法解决

设置空白页再重定向也无法解决

after working in firefox for a while and using a number of windows and the I close firefox with multiple windows open in my session. if i open it again and keep doing this for a while and then have closed firefox, eventually I can no longer open a firefox window and get a message the I have too many windows opn and can't open more till i close the open windows. i hover over the firefox app and all the previously closed windows are stacked up. why didn;t they close when i exited my firefox sessions. why are they still there and clogging up the system?

Two questions; First is why does the Taskbar show "Firefox (2)" (see first image) Second: When trying to troubleshoot, I open Task Manager, and with just one tab open, I see Firefox (13); confirmed when the line is expanded. What is going on here and is it impacting Firefox performance; see 2d and 3d images? (Phone camera photos as PrintScreen is disabled for Task Manager which doesn't seem smart)

Sometimes, for no apparent reason, on my Win 11 ASUS laptop, Firefox will suddenly use a lot of resources, such that the temperature jumps from about 50 degrees to 95 degrees and the fan runs full speed. It appears the only way to stop it, is to close FF then reopen. What might cause that?

I also have an unanswered previous question about being unable to pay accounts.

Cheers, Keith

I open Firefox, my browser, then I type in the site I want to open. It opens fine, however, when I try to open another site I want to open nothing happens except a little dot in front of the requested site keeps going back and forth, but nothing opens. I then have to close the browser, re-open the browser and key in the site I want. WHY? What am I doing wrong. Please keep in mind that I am not a computer savvy person and don't understand much about them. I do know however that Firefox used to work on my computer before update 150 and 151 were downloaded without a hitch. I have tried everything I could think of to fix the problem without success. I am beyond frustrated and need this fixed.

While I was using Firefox, the inspector console window started opening and closing all of a sudden. Whenever I try to click on a different tab that is not the one I am currently on, it switches back to my current tab. This issue also occurs on other Firefox-based browsers, and not on any other browser I have installed.

I attempted to change the theme, I went into Safe/Troubleshoot Mode, disabling my extensions, etc, but nothing changed. I've restarted my computer twice already, and yet it doesn't seem to change anything.

The only way I could temporarily halt it was through holding Ctrl, Alt and Shift at the same time, but this only worked for as long as I held all three keys down. What should I do about this?

I am on a new PC with Windows 11, using 4 monitors. I keep trying to figure out what is making my mouse and sometimes the keyboard behave sluggish (freezes for a moment). I have takes all suggestions that AI has suggested but it is still happening. Do you have any thing for me to try? It appears to be only when Firefox is running.

Select the text in the text input box to type (overlay typing), the Chinese input method will flash, then nothing will be typed and the selected text will disappear. 在文本输入框中选中文字进行打字（覆盖打字），中文输入法会闪一下，然后什么也打不出来并且选中的文字也不见了。 As in the following figure, it almost always happens when you select and overwrite text. 就像下面图中情景一样，对文字进行选择覆盖的时候几乎一定会发生。

Since updating to 152.0.4 on 30 June firefox has frozen multi times a day, nothing is responsive. I've had to force close and restart. I performed suggest hang fixes, refresh, changes places names, turned off accelerations. None of that resolved the issue. I did not have this issue prior to 152.0.4. No crashes, just hangs forcing restarts - but each one forces me to re-enter all my user information for the various sites I'm using. I've see some references of similar issues with others having upgrading to 152.0.4, but there don't appear to be any clear fixes. Is this issue being evaluated?

When my system slows down and takes forever to download, I go to task manager and find 15-20 entries for Firefox when I have only 1 or 2 pages open. Why are they continuing to pile up and slow down my machine and how do I stop it from happening?

Hello everyone,

I've recently noticed that Firefox has become slower than usual. Some websites take a long time to load, and occasionally the browser feels unresponsive even though my internet connection seems to be working fine. I've already tried restarting Firefox and clearing the cache, but the issue still occurs.

Has anyone experienced something similar or found a solution that improved Firefox's performance? Any suggestions would be appreciated.

Thank you!