Firefox Community Forum

starting about a month ago, my Firefox browser has become very slow. Sometimes now when I click a link (this happens about every 4-5 links) the spinning wheel of death appears and the browser doesn't respond. I have to force-quit

Since version 154, my 2017 Macbook Air running MacOS Monterey causes my fans to be always on. The battery preferences says "Using significant amount energy." I've turned off all AI features.

First post. Not really a question.

I noticed last week that some pages didn't load, and Activity monitor showing Firefox app using 170-180% which I know is way too high. Forgot to check memory usage.

I rolled back from 154 to 153 by restoring it from backup, and same with the Firefox folder in ~lib/appsupp/, relaunched Firefox and cpu was back to 2-4% cpu with a couple of windows and tabs. I've turned off auto-updates.

On my system, something is wrong with v154.

Mac Mini M4 Pro 12-core 24/512, macOS 15.7.5.

Hi folks My configuration: MacOS Tahoe FF 15.4.0 When I relaunched FF after restarting the Mac, in the Windows menu all the pages from the previous session were listed but none appeared when I tried selecting them. They must be hidden somewhere. I tried several work-arounds. The one that gives a result is by selecting in the View menu the Enter Full Screen item, then try to go back to a normal view which is a pain in the neck. Is there a clean method to make all those windows come back to their normal position and if possible preventing FF from doing this in the first place? TIA Nick

Firefox 153.0.4 on MacOSX 26.5.2 on a 2021 M1 Macbook Pro.

2 finger scroll barely works, it's very laggy. Sometimes 3-5 seconds after the physical movement.

Change: Settings -> Displays -> Promotion (set back to 60hz) fixes it.

So far no messing with about:config settings has fixed things. Turning on / off smooth scrolling makes no difference. Turning on / off hardware acceleration doesn't change anything,

Seems like a recent bug.

Hi Team,

In Firefox, the close button is only partially clickable and is not accessible on the right side. However, when I hover over it, a square background appears around the button. Could you please take a look?

Thank you

I updated to version 153.03. As a habit, before I close firefox I always clear browsing data. After the update, when I click "clear" to clear browsing data, the website freezes every time. I have to force quit to exit the website. I have macbook, sequoia 15.7.3

I have noticed for some time when I access Facebook the site reacts very slowly and hangs up frequently. When I access Facebook on the Chrome browser I don't experience the same problems. So, it appears my Facebook issue is a Firefox browser issue. Can anyone please help and explain how I can improve my Facebook experience while using Firefox. Appreciate any help. Thank you.

After updating to Firefox 153.0.1 on my 2026 MacBook Pro Silicon running Tahoe 26.5.2, my Firefox sidebar refuses to open, either by toggling the menu bookmark sidebar icon or pressing the shortcut keys.

Hello there,

I’m experiencing high memory and CPU usage in Firefox, which is affecting my computer’s performance. One issue appears to be that “FirefoxCP Isolated Web Content” continues running even when tabs are inactive, contributing to increased resource usage.

Other browsers, such as Microsoft Edge, reduce memory and energy consumption by putting inactive tabs into sleep mode after a period of inactivity. I would prefer to continue using Firefox as my default browser, but I need a way to manage this level of resource usage.

Could you please advise whether Firefox offers a comparable setting, workaround, or planned improvement to reduce CPU and memory usage from inactive tabs?

Thanks for your help!

Using a 2023 Macbook Pro with M3 Apple Silicon and MacOS Tahoe 26.5.1.

When I open the Bookmarks manager in Firefox and use it for a while, the main Apple menu for the Firefox app vanishes. It's only the text menu items that vanish. The icons on the right, plus date/time remain visible. Sometimes, the menu is still visible, but not operable. Clicking on any menu item does nothing.

Once the menu has vanished or locked up, it remains in that state for Firefox. If I select a different app, the menu reappears for that app and functions normally. Returning to Firefox returns the vanished or locked state for the menu.

Even stranger, the menu disappeared while I was writing this post.

I have found a workaround. If I select the green circle and then Full Screen, then exit Full Screen, the menu reappears and is working.

Has anyone else seen this? Is there some setting on Firefox that I can change to prevent this behavior?

Thanks.

Hi whenever I use my Google account to sign into websites (Google, ebay, YouTube, & anyother sites,) Firefox will become unresponsive, the window containing the tab i was using becomes unresponsive, sort of. - I can't click any open Firefox Tabs, - the red 'Close' radio button is greyed-out, so I can't close any tabs or the window - right-click is unresponsive, so i can't close tabs that way, but Command-W closes the tabs normally, but the others are still unresponsive.

- i can open a new Firefox window (with &/or without Tabs,) which works normally.

- & unrelated, but earlier, Firefox was running really slowly, Youtube videos were slowed down, but audio was normal, and scrolling was slow.

After installing Firefox 150, clicking on a window for a different application does not make that application active. Firefox is not letting me leave! I can switch by going to the sidebar and choosing a different application. None of the other applications exhibit this behavior. MacOS 26.3.1

This new issue is puzzling:

Normally, on MacOS, when you minimize an app that's currently running and occupying the desktop, say by clicking the orange button at top left or by clicking another app, its menu would disappear from the top toolbar and other apps could then be invoked. Clicking that app icon again would restore it to the screen and its menu would again be on the top toolbar.

But Firefox has stopped allowing that behavior: Now, when I try to minimize Firefox, while its screen minimizes (revealing the desktop underneath), its menu remains on the top toolbar. It is as if Firefox refuses to let go of the controls. So, while you can see the other icons on the desktop - say file folders - they are unresponsive to clicks and do not open when you click them, as if Firefox is not letting you access File Manager.

Furthermore, you can still access these desktop file folders, but only by opening the finder using the bottom toolbar menu, not by clicking the file icons directly.

For what it's worth, all menus are still responsive (bottom toolbar, top toolbar, apple menu), just nothing that's on the desktop responds when Firefox is still running, despite being minimized.

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.

When I launch Firefox, it uses well under 1GB in memory, but then it starts to increase that amount quickly in just a few minutes and gets up to 50+GB, causing error messages to pop up repeatedly until it uses all resources and locks up my computer. I have updated my MAC OS and the Firefox app, uninstalled the Firefox App and still have the same problem.

Please help

Sporadically over the past year, a virus warning, purportedly from Apple, has locked my FireFox screen. I must Force Quit to unlock FoxFire. See images. Is this a scam?