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I have an issue with the app. When I return Firefox from the background, the app becomes partially unresponsive: the ui still responds to touches, but the current tab content remains blank for 3–10 seconds. After that delay, the tab content appears and Firefox continues working normally. The issue happens after using other apps for some time before returning to Firefox. It does not happen if I simply switch Firefox to the background and immediately bring it back to the foreground. It looks like a Firefox child/content process may be getting killed or evicted from memory while the app is in the background, but I have modern device with enough free memory (xiaomi 17 ultra, 16 gb ram). I've already tried popular suggestions: - Disable any restrictions in battery optimizations - Lock the app in memory - Allow app autostart - Disable memory extension (swap) in the system settings - Checked background process limit - "standard"

The same issue happens on tablet xiaomi pad 6 pro (12 gb of ram, hyperos 3 as x17u). The issue appeared ~4-5 month ago after ordinary Firefox update. What useful logs can I collect to help resolve it?

I've recorded a video of the issue with current versions of Firefox and Firefox Nightly https://youtube.com/shorts/JHxeODD3IQk . On video I reload `example.com` in both browsers, switch to other apps and return back to each browser. Firefox is locked in memory (see icon in task manager), Nightly is not. While tab is stuck in Firefox, I show that UI is working (menu is opened immediately).

whenever i scroll trough a website in firefox, the ewperience is very laggy, feels like its 15fps. i have done basic things like disabling hardware acceleration, smooth smooth scrolling.

Using cmd-tilde keys on MacBook Pro to change front viewed page no longer works reliably under Tahoe. Any workaround? Also, Firefox sometimes freezes Navigation between programs, and the only way to navigate is to quit Firefox. I'm on Tahoe 26.4 MacBook Pro 2023 M2 Max. Thanks.

Dear Firefox Support Team,

I am writing to report an issue I’ve been experiencing with Firefox on my MacBook Air (M3, 8GB RAM). Recently, Firefox has been becoming unresponsive quite often, and the Activity Monitor shows significantly high memory usage. For context, I typically have two Firefox windows running simultaneously, with approximately 5 tabs open in each window (10 tabs total). This is when I notice the performance degradation and high memory usage.

To help you investigate, I’ve attached:

• A screenshot of the memory usage in Activity Monitor when Firefox is running.
• A screenshot of the extensions currently enabled in Firefox.

I am open to suggestions, such as disabling or removing certain extensions if they might be causing conflicts. However, I wanted to report this issue first to understand if this is a known problem or if there are optimizations planned for Firefox on Apple Silicon Macs.

Let me know if you need additional details, such as Firefox version, macOS version, or specific steps to reproduce the issue. I’d be happy to provide any information that can help resolve this.

Thank you for your time and assistance. I look forward to your response.

Best regards, Hemant

So out of nowhere, I can't use the back button, or delete pages by clicking the 'x. I can't even click on the settings icon, or any icon on the menu bar. When I hover over any web page title, it shows a small window of it, but I can't get rid of it. I didn't change anything, so what's going on?

On a random basis, sites like msn.com, yahoo mail or outlook.com will freeze. Sometimes they may suddenly come back to life, but the normal fix is delete tab and restart tab. Long videos may also freeze. Have cleared history, and changed optimization setting but nothing helps. On 151.0.2 64 bit.

This problem is worst when doing online shopping. When entering card details, I will often need to switch to my banking app to confirm a transaction. When I return to Firefox this will then reload the page, usually losing the transaction state and making it impossible to complete the purchase.

Windows 11. I have my taskbar behaviour set to ‘Automatically hide the Taskbar’ So usually the Taskbar is not displayed, but when I move my cursor to the bottom of the screen it reappears. With Firefox I cannot make the Taskbar reappear.

Hi. Recently, a old issue has comeback on my firefox. When I load youtube video, or a twitch livestream, at 60FPS, and I scroll down the page, the scroll "lags" until the player is off screen. By lags i mean it slows down the scroll and is no longer smooth. This is an issue I've had before and had successfully dealt with by accessing about:config and turning media vp9 off, but it has returned fairly recently, since I do not remember this issue happening before the last week, maybe two. Another issue, also on youtube, is that when I scroll down through shorts, sometimes after a couple of videos, the browser will visually freeze entirely, but will still allow me to click things on the page and also play sounds. After about 20 or so seconds, it will unfreeze and work normally.

I understand that this issue, atleast the 60fps scroll lag, has been an issue for a while and I have tried multiple fixes for it, changing various boolean settings, refreshing firefox, updating my Nvidia drivers to the newest via nvidia app which i should add has never been an issue for the past few months and has worked flawlessly and my nighmarish evening of troubleshooting ended with me completely fully uninstalling firefox and redownloading fresh, but the issue presists.

It should be noted that on other browsers, I have no such issue. Im not sure if mentioning this is some sort of taboo or persona non grata, but i also downloaded and tested Waterfox, and it also does not have this issue. The only band aid fix I found for the moment is that turning off Hardware Acceleration fixes the scroll issue, but it causes awful screen tearing, which is just as bad and distracting.

So to my understanding, 3 potential things are happening. This issue is just in my head Something on my pc is dying and I have a mechanical or software problem Or finally, there is some issue with a recent update, either with firefox or maybe some driver somewhere causing an issue. It just upsets me greatly due to this being a relatively new issue. As stated I have dealt with the scroll lag before and did find a permanent fix, and firefox has since worked literally flawlessly for months/years. But now, somewhere within the last week, maybe 2, something has gone wrong. I hope this gets fixed in an update, or if others have this problem there is a fix. Thank you.

When I launch Firefox in Troubleshoot Mode and try to open the Settings page (about:preferences) right away, Firefox becomes unresponsive. This issue does not occur when Troubleshoot Mode is off.

I'm using Firefox 140.0.4 on macOS Sequoia 15.5.

Just a note that I had a lot of probem with the firefox not opening when a link is being clicked. It would open in background but not come to focus.

External hyperlinks do not open in Firefox window.

I found that focusmanager.testmode was the cuplrit, after a lot of hard work.

Running Mozilla 151.1 (72455) on iPhone 13Pro Max using iOS 26.3.1 (a)

Anyone else experiencing the following?

If I am browsing any web page in private mode, then tap the "+" to add a new private window, I can not get to / tap on the navigation bar to type a URL. It ceases to be an input field. I have to exit the browser completely and start anew.

Hi there poor performance lately. I’m having to constantly pause my vpn of jump onto safari where I don’t have to pause my vpn. The browsers are freezing. Which is really annoying when I’ve completed a big form. I have to redo it all over again. Are there any issues ? I’m in Halesowen England

Hello,

When I opened Firefox this morning, it downed the newest version.

Since then it becomes nearly impossible to use, locking up after a few minutes.

Are you aware? Is this being fixed? Can I go back one version? I used Windows 10, is that the issue?

Thank you.