Firefox Community Forum

The problem (Firefox being slow) happens within the confines of Troubleshoot Mode, I have already attempted a restart as well as clearing all temporary cached files and pages to no avail. While I did manage to make it better through setting my proxy settings to 'No Proxy', Firefox still seems to be running at a slower pace than even the dreaded Chrome. Youtube is the worst offender, with videos that used to run smoothly in Chrome now lagging, buffering, and moving so slow that Youtube is forced to automatically reduce the video quality (however, I should note that even on 360p do I encounter a large amount of slowness). Please note that I am a total dummy when it comes to technical stuff, so I will most likely need extensive and comprehensive instructions on ways to solve/diagnose this issue. I thank anyone who's willing to help me with this, it's the only thing that Firefox is worse at in comparison with Chrome.

On macOS (Sonoma for me), if a Firefox window has focus and and there is a window that doesn't have a dock icon (for example, the "About This Mac" window) that is behind the Firefox window, using Mission Control to bring that window to the front doesn't work.

Well, actually it does work, but then the Firefox window immediately comes back to the front. If any other app has the focus, then it works correctly (Firefox doesn't force its way back to the front).

Does anyone else experience this, or is it just my system?

Hello! Appreciate the help I could get. It is rather hard to type when the letters are disappearing as I type it out. I will provide screenshots of my issues and hopefully someone could help me out. I just downloaded the browser and have no idea how to fix the issues. The tabs are constantly flickering in different colors. The letter are disappearing or merging together or sometimes written in bold, crossed out, or underlined. It is making it rather hard to use the browser haha, but let me know what else I can provide to help out identify the issue. THANKS!

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.

https://gist.github.com/ben-j-c/6d15852955d04c9018600d15d4a8a13e

Context: Here is an animation I generate with a program I'm developing. It being an SVG makes it useful to open in a web-browser. In chromium based browsers I have smooth animation, while in firefox I get much worse performance. At larger animations the problem becomes much more apparent. This is the approximately the largest animation that firefox can handle without lagging too much.

Expected: Firefox should have comparable SVG animation performance as chromium.

Hello... So, a couple of weeks ago, there was a 15-hour blackout during a Windows 11 update. I had exited firefox, and was shutting the laptop down, and it asked if I wanted to update and shut down (or other options). I chose update and close. When the lights came on and the router booted back up, Windows finished updating. It works, but here is the rub: whenever Ffox runs, a couple of minutes into the sessions, it will start displaying previous session screens, screen saver-like: one after the other every ten seconds or so. I can't X out, because it disappears whenever I move the cursor. The images appear not only on Ffox, but cover whatever other app's screen until I move the cursor, which is irritating when you're trying to meet the deadline on a novel! Please help! I am running version 140, by the way.

If a page is maximized I can not move it - I have to click on the 'intermediate' of the three choices (minimize, intermediate, maximize) before I can move it or resize it.

I have three monitors. It's the same behavior on all three.

For some reason my Firefox has started to become much slower when I view / watch anything in full screen, it doesn't matter from where. A Twitch stream in full screen? The Video Player becomes slow, even using the escape key to leave fullscreen takes a bit. Youtube video in fullscreen? Same thing happens. No matter what site is being used, if I go full screen on any video player, everything becomes suuuper laggy. I've tested other browsers and they don't seem to have that issue so it's not a hardware or connection issue.

help me to use the browser!

I just simply need it to maximize.

I'm not too tech savvy. The only thing I tried was to reinstall Firefox which did not help.

I've recently swapped to Firefox from Chrome and I've noticed a huge hindrance.

I use a chatroom website and when I swap to the tab and begin to type, the first letter is randomly eaten/won't be entered into the text field.

For instance I was typing the word "What" and the text field only displayed "hat". Or when typing "Either" only "ither" appeared.

I thought this may have been related to a hardware acceleration issue but both settings did not work. So I started to look at Hotkeys but none of them should be interfering.

Some others have stated they have this issue too and I've been unable to find any solution. Any help?