Showing questions for topic:

Vertical sync screen tearing

Firefox version: 153.0.4 / Windows 11 25H2 26200.9168 Attached are images showing the performance settings and the active extensions in case any of them proves to be resp… (xle nububuwo)

Firefox version: 153.0.4 / Windows 11 25H2 26200.9168

Attached are images showing the performance settings and the active extensions in case any of them proves to be responsible for the problem.

Yesterday I noticed a horizontal screen tear when scrolling down through sites like X(Twitter), YouTube, GMail, Reddit etc. I immediately checked my performance options and they were deselected. I activated them again, but this did not solve the problem, I also tried to active some layers in about:config but those were already activated. Checked Nvidia settings too, vsync is on, Edge is not affected, Chrome is not affected, even installed Waterfox to see if only Firefox-based browsers are affected, but that one was OK too.

Last resort was to refresh the Firefox installation from the uninstall utility. After the refresh and all settings/extensions got auto-reinstalled, the screen tear got fixed. I left the PC running over night and when I accessed Firefox again this morning, the screen tear problem was back. However, now, the performance options are disabled, and if I try to enable them and restart Firefox, the options get disabled again.

Would really appreciate it if anyone could provide a solution that does not involve refreshing Firefox daily.

Open 3

Firefox becomes slow and pages take longer to load after using the browser for some time

Firefox becomes noticeably slower after I have been using it for some time. Pages may take longer to load, tabs sometimes become unresponsive for a few seconds, and switc… (xle nububuwo)

Firefox becomes noticeably slower after I have been using it for some time. Pages may take longer to load, tabs sometimes become unresponsive for a few seconds, and switching between multiple tabs can feel delayed.

I have already tried restarting Firefox and closing unnecessary tabs, but the issue can return after continued use. I would like to know what could be causing this performance problem and which troubleshooting steps I should try.

Could extensions, cached data, memory usage, or hardware acceleration be responsible? What Firefox settings or diagnostic information should I check to identify the cause?

Open 1

Why is YouTube video playback choppy in Firefox for Android, and what settings can I change to fix it?

Please provide a clear, step-by-step troubleshooting solution specifically for Firefox for Android. Explain the possible causes of choppy YouTube playback and show me whi… (xle nububuwo)

Please provide a clear, step-by-step troubleshooting solution specifically for Firefox for Android. Explain the possible causes of choppy YouTube playback and show me which Firefox settings to check or change, including hardware acceleration, extensions, video quality, cache, and performance settings. Please explain what to do at each step and how to test whether the problem has been fixed.

Open 1

Firefox takes long to start after recent update

After updating to Firefox 138 on Windows 11, startup takes about 30 seconds. Safe Mode is faster. I tried refreshing and it did not help. Marked **bold test** and [a link… (xle nububuwo)

After updating to Firefox 138 on Windows 11, startup takes about 30 seconds. Safe Mode is faster. I tried refreshing and it did not help. Marked **bold test** and [a link](https://example.org) plus {{7*7}} literal check.

Open 1

Firefox freezes so pages don’t load and I can’t open or close tabs

Recently (past few weeks) I’ve found Firefox on my iPhone (iOS 26.5.2) has stopped loading. I’ll open the app and it won’t load the page at all. It also doesn’t let me re… (xle nububuwo)

Recently (past few weeks) I’ve found Firefox on my iPhone (iOS 26.5.2) has stopped loading. I’ll open the app and it won’t load the page at all. It also doesn’t let me reload the page, add tabs, or close tabs. Occasionally it will fix if I click a link from an SMS or something that then opens in the app. Quitting Firefox doesn’t work, restarting my phone also doesn’t work.

Open 7 40

Mozilla keeps freezing with Program not responding

For the last four days every time I go to clear my history,"Program not responding" with a white a line at the top of the page with a message to close program or wait fo… (xle nububuwo)

For the last four days every time I go to clear my history,"Program not responding" with a white a line at the top of the page with a message to close program or wait for response. I have tried restarting my computer with no change. If I close the program and restart I don't see a change. It seems to be intermittent. Please find out what is causing this glitch .

Thank you.

Open 4

Firefox takes about a minute to display first site, then is OK

Hello, For about two or three days now, when I launch Firefox and try to open any website, it takes maybe one minute to load the page, then the navigation is OK on every … (xle nububuwo)

Hello, For about two or three days now, when I launch Firefox and try to open any website, it takes maybe one minute to load the page, then the navigation is OK on every website.

It only happens when I launch Firefox for the first time of my session. If I close it then relaunch it, it's still very swift.

I tried clear cache and remove cookies, just lost my logins lol but didn't work. I also tried with no extensions, nothing changed. Lastly I tried to set "network.captive-portal-service.enabled" to "false" in "about:config" but it didn't change anything neither.

So before I try anything else that could erase something on my profile, I'd rather ask here for some help :)

PS: running FF 153.0.4 on Debian Trixie with Mozilla repos. Only have two extensions: µblockOrigin and NoScript.

Thank you in advance!

Solved 8

2 finger scrolling is incompatible with mac's "promotion"

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: Setti… (xle nububuwo)

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.

Open 1

multiple 1-minute charts forcing my CPU/GPU to constantly render live data

I am running 10 or more tabs with tradevision.io showing real time stock charts running multiple 1-minute charts forcing my CPU/GPU to constantly render live data. Enabli… (xle nububuwo)

I am running 10 or more tabs with tradevision.io showing real time stock charts running multiple 1-minute charts forcing my CPU/GPU to constantly render live data. Enabling Hardware Acceleration in your browser settings can help balance the load and keep things running cooler but it made no difference. Prices still freeze and I have to constantly refresh. The CPU is flat out and running hot - my laptop is a top of the range xps 16

Open 1

Tabs randomly freeze/unresponsive after resuming from sleep (Windows 11)

Hi everyone, Since updating to Firefox 129 on Windows 11, some tabs become unresponsive after my laptop wakes from sleep — no crash, no "Not Responding" warning, just fro… (xle nububuwo)

Hi everyone,

Since updating to Firefox 129 on Windows 11, some tabs become unresponsive after my laptop wakes from sleep — no crash, no "Not Responding" warning, just frozen. about:processes shows the tab still running with ~0% CPU, so it's not hung, just not repainting.

Tried: disabling hardware acceleration (helps a bit), fresh profile (still happens), Troubleshoot Mode (less frequent but not gone).

Anyone else seeing this? Known WebRender/compositor bug tied to sleep/resume, or a Windows 11 power management conflict?

Thanks!

Open 1

Why does firefox go fullscreen randomly on its own?

For at least a few months now, my browser will suddenly and randomly go fullscreen all by itself. I can't exit it, and then it goes back to normal after at most a minute… (xle nububuwo)

For at least a few months now, my browser will suddenly and randomly go fullscreen all by itself. I can't exit it, and then it goes back to normal after at most a minute. It hasn't happened in at least a week. But today, it froze like that, not responding. I quit firefox, waited a bit, then restarted it. It went fullscreen and froze again. I waited at least 10min and it then went back to normal and responded again. It only happens when using firefox. I've done virus scans, etc, and it still keeps happening. Please help. Thanks.

Open

Firefox opens 17 operations for one window eating up memory and processing power

I have a Windows 10 Pro system and Firefox continues to open up at least 17 processes for one internet window. This eats up system resources for nothing more than general… (xle nububuwo)

I have a Windows 10 Pro system and Firefox continues to open up at least 17 processes for one internet window. This eats up system resources for nothing more than general web browsing. How can these processes be limited? Thank you.

Open 1

Hanging requests when closing the browser while offline

Hi! We have automated tests that run in Firefox across a large number of instances. There are about a hundred nodes where the browser is launched. For security reasons, t… (xle nububuwo)

Hi! We have automated tests that run in Firefox across a large number of instances. There are about a hundred nodes where the browser is launched. For security reasons, there is no Internet access. When the browser closes, requests are sent to 146.75.117.91. Since there is no Internet connection, the request fails to complete, and the process terminates due to a timeout. Because the browser is controlled by geckodriver, the `driver.close()` call fails with an error. I’ve tried numerous browser startup options, but none solve the problem; the process still crashes. The only thing that works is blocking the IP address at the firewall level or in the `hosts` file. However, I’m not happy with this solution because it would need to be applied to a hundred nodes, which would create scalability issues down the line. Are there perhaps any options I missed? I also found these addresses in `omni.ja`. Could it be that they are hardcoded and cannot be changed via options?


What I tried

  1. телеметрия

options.set_preference('toolkit.telemetry.enabled', False)

options.set_preference('toolkit.telemetry.rejected', True)

options.set_preference('datareporting.healthreport.uploadEnabled', False)

options.set_preference('datareporting.policy.dataSubmissionEnabled', False)

options.set_preference('toolkit.telemetry.shutdownPingSender.enabled', False)

options.set_preference('toolkit.telemetry.shutdownPingSender.enabledFirstSession', False)

options.set_preference('toolkit.telemetry.firstShutdownPing.enabled', False)

options.set_preference("telemetry.fog.init_on_shutdown", False)


pac = """data:text/plain,function FindProxyForURL(url, host) {

   var blocked = [
       "incoming.telemetry.mozilla.org",
       "telemetry.mozilla.org",
       "normandy.cdn.mozilla.net",
       "firefox.settings.services.mozilla.com",
       "contile.services.mozilla.com",
       "push.services.mozilla.com",
       "aus5.mozilla.org",
       "versioncheck.addons.mozilla.org"
   ];
   for (var i = 0; i < blocked.length; i++) {
       if (dnsDomainIs(host, blocked[i]) || host == blocked[i]) {
           return "PROXY 127.0.0.1:1";
       }
   }
   return "DIRECT";

}"""

fp.set_preference('network.proxy.type', 2)

fp.set_preference('network.proxy.autoconfig_url', pac)


  1. Направить телеметрию в несуществующий адрес

options.set_preference('toolkit.telemetry.server', )

options.set_preference('toolkit.telemetry.server_owner', 'localhost')


  1. Или через proxy — завернуть весь трафик в несуществующий прокси
  2. только для доменов телеметрии это сложно, но можно отключить все внешние запросы при shutdown

fp.set_preference('toolkit.telemetry.shutdownPingSender.backgroundtask.enabled', False)


  1. fp.set_preference('toolkit.asyncshutdown.crash_timeout', 10000)

fp.set_preference('telemetry.fog.log.level', 'off')

fp.set_preference('telemetry.fog.artifact_build', False)

  1. Отключить фоновые задачи при shutdown

fp.set_preference('browser.background.tasks.enabled', False)

fp.set_preference('browser.backgroundtasks.scheduled.task.timeout.sec', 0)


  1. Заблокировать через hosts-like механизм Firefox

options.set_preference('network.dns.localDomains',

                 'incoming.telemetry.mozilla.org,telemetry.mozilla.org,normandy.cdn.mozilla.net')


options.set_preference('network.captive-portal-service.enabled', False)

options.set_preference('network.connectivity-service.enabled', False)


  1. Отключить Mozilla Remote Settings

options.set_preference('services.settings.server', )


  1. Glean telemetry (новая система Mozilla)

options.set_preference('telemetry.fog.artifact_build', False)

options.set_preference('telemetry.fog.test.localhost_port', -1)

options.set_preference('toolkit.telemetry.archive.enabled', False)

options.set_preference('toolkit.telemetry.bhrPing.enabled', False)

options.set_preference('toolkit.telemetry.newProfilePing.enabled', False)

options.set_preference('toolkit.telemetry.reportingPolicy.firstRun', False)

options.set_preference('toolkit.telemetry.unified', False)

options.set_preference('toolkit.telemetry.unifiedIsOptIn ', False)

options.set_preference('toolkit.telemetry.prompted ', 2)

options.set_preference('toolkit.telemetry.unifiedIsOptIn ', False)

options.set_preference('toolkit.telemetry.updatePing.enabled', False)


  1. Отключить Glean полностью

options.set_preference('datareporting.glean.enabled', False)

options.set_preference('telemetry.fog.enabled', False)

Open 3

Inspect close button is partially unclickable.

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 arou… (xle nububuwo)

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

Solved 12 49

My mouse no longer scrolls properly - does anyoine have a solution

Hi everyone, After a recent series of updates to both my mouse and Firefox, my mouse no longer scrolls within Firefox. The mouse is Logi wireless mouse. Firefox is the la… (xle nububuwo)

Hi everyone,

After a recent series of updates to both my mouse and Firefox, my mouse no longer scrolls within Firefox. The mouse is Logi wireless mouse. Firefox is the latest version. The mouse scrolls fine in other apps, like WhatsApp, Outlook, Word etc. but not in Firefox.

When I try to scroll in Firefox, it stutters, jumps and will continue to jump even when I stop scrolling on the mouse.

I have spoken to Logi and there is no issue with the mouse itself.

I have tried Troubleshoot and Private mode, but still the same issue, so its not an add-on or extension problem.

Is anyone else having this issue over the last couple of days, or have any ideas on how to get back to smooth scrolling?

Thank you, Graham

Open