Firefox Community Forum

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?

I can't download some pdfs, notably my bank statements. I CAN download some pdfs. Eg, I can download my car manual (although it's a process of downloading it to my Google Drive). However, trying to download my bank statements, Firefox gives me no options at all, and, indeed, I get an error message. Yet I CAN download my bank statements using Google Chrome! I've carefully checked all my Firefox settings, but nothing seems to address this problem. I've spoken to my bank, and they don't know why I can't download them either. When I try to download the statements, I get a screen saying it can't give me a 'Preview' (see attached screenshot), but there's a 'Download button. When I click that I get a white screen with the 'error' message:

"No API key found in request. request_id: d52e0732a3d10a75b1ec58534845c15c"

(2nd attached screenshot.)

I have asked about this before on this forum, but to no avail.

As described, I (changes being intended as temporary) changed the maximal size for the sidebar to open upon hover. Only when, at that length, I try to revert the change, the sidebar closes before I can "grip" the edge of the sidebar to shrink its length.

My issue is not that I cannot fix this change. My issue is that my change isn't permenant. I followed the standard steps of "Right-click anywhere on Sidebar > select 'Customise Sidebar' in menu > let Sidebar collapse > in 'Customise Sidebar' panel deselect 'Expand sidebar on hover' option > close 'Customise Sidebar' panel > pick up the RH edge of now stationary Sidebar by hovering mouse until the 'gripper' symbol (double-headed arrow) appears... drag RH edge of Sidebar to desired new max-open width."

The issue is that, after doing this, the sidebar reverts to taking up half the screen once I re-enable "Expand sidebar on hover" and reversing the steps listed above.

Any help would be appreciated! I'd rather not have to re-install.

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

Previously all my tabs would launch when I opened Firefox. Recently it has stopped doing so. Only one tab opens. All the other tabs I use frequently do not open. Why is this? How do I have all my tabs open when I open Firefox

After the most recent Firefox update all my bookmarks were scrambled. For example, when I open one marked Bank of America, I get Go Daddy. How do I restore my bookmarks to what they were before the update?

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.

Hello, I've been using Firefox for years, but last couple months or so - it's been losing Internet connection - I have to stop and restart it and all ok - somtimes for 5 mins - sometimes for 15 or so - but it's doing my head in :) Any help appreciated - Thanks

I have st installed Lime on my old Asus Zenbook an have installed Nord VPN. I am using the Firefox browser showing connected to the internet but am unable to access my webmail account and its popping up messges advising Problem loading webpage and another showing 502 Bad gateway. I am also having problem with the Zenbooks Keyboard with keys randomly not operating when pressed but will work after a prolonged or multi pressing.

the password logins are confusing.disturbing and stifling my project,i need to log in to Carprog Online but your password page wont allow me therefore delaying my time in

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.

Playback works correctly usually, but if I jump forward or backwards in time it sometimes never loads. This also completely bricks the whole brower, all other tabs etc, until I close firefox and restart it. This happens on all vods of twitch, and also livestreams where I am able to rewind (subscriber function). I have no extensions enabled, and have the default settings on firefox etc. ("Use recommended performance settings") Video of it happening: https://www.youtube.com/watch?v=3difRLhE-cA

It is as if Firefox has disappeared from my desktop. I click on the shortcut but nothing happens. It was working fine last night. I have tried uninstalling/reinstalling but still nothing. A window does not even appear.

Moderator note: This question has need edited to add the OS info provided by the OP.

Not 100% sure if the topic is the right one, but here we go - I use a Macbook with Firefox 153.0.3, UK Keyboard (QWERTY) It's about the command + ` (the key in the left upper corner below the esc key, I made the ` bold so it's easier to see)

Sometimes, but only sometimes, the keyboard shortcut command + ` to cycle through open windows in Firefox does not work.

For example, I have two windows open (W1 and W2). If I'm in W1 I can use the command and it will cycle to W2. But using the same shortcut, I can't navigate back to W1. But if I use command+ SHIFT+ ` it works. This changes from day to day, sometimes it's command +` and sometimes it's command+ shift+`

This only affects Firefox, in all other programmes, the shortcut works as it should Can't find rhyme or reason- does anyone have an idea?

For the past few weeks, I have been having problems playing certain Facebook videos. It seems to only happen when I try to play a video that was recorded live. I have tried clearing the cache, I've tried a private window, and I've tried safe mode. I still can't get the video to play. However, when I copy and paste the url to Safari, it works fine. I have been able to play "live" videos while they are actually "live"; it's just that they will not load when I try to play them later. I don't have any problems playing videos which have been uploaded to Facebook; only those which were recorded live. The videos just show a circle in the middle as if they are trying to load but nothing else happens. The length of the video does not matter; it happens with short videos as well as long ones. The screenshot image (of a random "live" video I found) I am uploading shows a partial black circle in the center, which is a spinning circle in realtime. I have circled it in red.

HI All Recently purchased a laptop and want to have FF sync with my desk top. I am signed in to both devices with the same account and have checked all settings on both and they are identical. Why are they not syncing?

Hi, I'm having this problem on 2 PCs and I'm not sure what in the world is going on. It's not only this browser but I'm trying to get Firefox sorted.

When on sites like Walmart or Costco I'll be scrolling down, click on something, hit 'back'...and then it won't return me to where I left off.

I'm really at wits end. I don't know if I have viruses on both causing aberrant behavior.

If the internet were in it's infancy last century, this would be understandable...or again maybe I have two compromised machines. I'm on the Malwarebytes forum doing all kinds of things to no avail. Defender and Malwarebytes don't find anything.

Thanks if anyone can provide some help. I'm starting to consider a dastardly ipad at this point...

Title says it all, "auto resize pictures using CTRL - + does not work". Generally speaking, the size of pictures simply WILL NOT reduce in size to view its entirety. Even when the scroll-bars are used the picture is still to wide. I have searched and asked for any setting in about_config, NOTHING! I truly expected something. The ONLY STUPID WAY to view said oversize picture is Download it then view. Isn't that a HACKERS DREAM??? YES I HAVE tried looking in SETTINGS and searched for months, found nothing that actually works. So now I have to use that 4-LETTER word... HELP!