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After March or Febuary I think? Bookmarks become incredably slow. My device is a S20 FE rooted using U.N.1.C.A ROM and using Snapdragon 865 processor. It took roughly 80 seconds or more just to open the main bookmark folder. I also have big bookmark folders but it worked fine on the last update. I came across a Reddit post with similar situation: https://www.reddit.com/r/firefox/comments/1rhe8a5/bookmarks_are_a_lot_slower_to_change_location_on/ This is all I can gather

Switching between private browsing mode to normal browsing mode or vice versa results I the header size increasing. Need to close it and reopen for it to go back to normal. Running Android 15 on an Asus Zenfone 10

after working in firefox for a while and using a number of windows and the I close firefox with multiple windows open in my session. if i open it again and keep doing this for a while and then have closed firefox, eventually I can no longer open a firefox window and get a message the I have too many windows opn and can't open more till i close the open windows. i hover over the firefox app and all the previously closed windows are stacked up. why didn;t they close when i exited my firefox sessions. why are they still there and clogging up the system?

My Dell Precision Laptop from 2019 runs a frequently updated Ubuntu 24.04. About one or two weeks ago, after one of the latest Firefox updates, i noticed that video streaming produces rectangular flickering in rapid sweeps. ( Also fast scrolling large text websites produces similar flickering, I think I would have noticed it before...) . If you detected it once, you see it always again... :-( First I fiddled around with the nvidia settings because the driver was also recently updated, without much success. Playing locally stored videos, e.g. with VLC media player, still works fine, so the nvidia driver is not the problem i think. Yesterday I installed Chromium and the video performance is fine! As good as with firefox some weeks ago! So it must be one of the latest updates, that causes the problem. Generally I like firefox more than chromium. I like the control you have, e.g. via Add ons.. So I hope that the firefox performance will increase again... Thank you for firefox! Florian Mengedoht

hi, I have this odd issue lately that when I type something in the browser, search engines in particular, then hit the enter key on the on screen keyboard, and then click inside the same inputfield again that the backspace button switches behavior and no longer affects the text field but deletes the last letter from the word in the auto-correct-suggestion panel diirectly above the keyboard. clicking back into the browsers textbox doesn't help either. I have to press backspace several times until auto-correct stops suggesting new words, (turning off auto suggest doesn't fix it) then focus returns to the inputfield in the browser

I can repro it with multiple keyboard apps (microsoft & heliboard), on different search engine websites but it only happens in Firefox not in chrome nor any other Android app.

I also noticed that when I move the text cursor somewhere with a tap in this input field and then hit backspace, then it will show the context menu (copy, paste, insert...) for less than a second and instantly close it again. Pressing backspace a second time doesn't trigger it again until you move the input cursor with a tap again.

I only use uBlock but disabling it didn't help. Phone: Nothing 3

Ever since I got the 150.0, the issue is the following: when I use the AI feature or search something on the internet, the first time everything is OK. If i would search something else or reply to the AI feature, the text appears to be doubled. In example

II wantwant toto knowknow thethe basicbasic signsign languagelanguage formatformat

Recently when typing on Firefox on the duckduckgo search engine, anything you type gets doubled, and you cannot backspace. The issue doesn't occur when on Google page, only on ddg. I also tried different keyboard apps and the issue still persists. I went to the same page on Google chrome and the issue does not occur. This just started happening within the last week or so. If it matters/helps, I'm on Samsung s24 ultra.

Arch Linux Wayland FF v150 from Arch repos

When right clicking the context menu appears, but sometimes in odd places, and the disappears, so you can't select anything.

Same is true selecting the Help submenu from the Hamburger menu.

Restarting the browser fixes it for a few minutes, then same problem comes back.

Other people also reporting the same thing - also Linux Wayland: https://www.reddit.com/r/firefox/comments/1suounc/comment/oi7jk9u/

Even with just 1 tab open, Firefox is killing my laptop battery.

Win 11 PC laptop.

In background, it is using 40% to 50% of the laptop battery. I need much better performance from it. I have already turned off any settings I can find regarding Firefox's background functions. When I quit Firefox I want it completely off.

How can I do that?

I often keep many tabs open for research, and Firefox memory usage grows significantly over time. Are there practical settings or habits that help manage memory without sacrificing usability?

Hello its been a 2 or 3 months I have been using firefox and always have meet multiple malfunction on the browser, its not that I am saying its bad tho I like the GUI design and the features it have. But this recently update i experiences a malfunction that when I try to type a wrong word autocorrecting is kinda multi hopping like its scrabble some words I try to clear cache it and even clear cache my keyboard but still their. Hope mozilla find this bug immediately

I go to a website and it tells me that it has emailed me a code. I have to go to another app to bring up my email to get the code. When I go back to Firefox using the recent apps feature, on my phone, Firefox reloads to the previous page and I have to start all over again because you've gotten rid of the page I was on, to put the code in. It's an endless cycle. Since I'm not actually closing Firefox why can't it open onto the page I was just on?

Hi Mozilla Can you improve firefox 115 in next update because this browser is slow and need to improvements in performance, i'm using windows 8.1 and i'm can't upgrade to windows 10

Hi,

I’ve recently noticed that after a Firefox update, the browser has become very slow and unresponsive whenever I open multiple tabs, around 5–10. Before this update, I could open many tabs without any noticeable lag.

Now, new tabs take a long time to load, scrolling within open tabs feels choppy, and sometimes Firefox freezes for a few seconds before responding again.

I’ve already tried restarting Firefox, disabling extensions one by one, and clearing the cache, but none of these steps have improved the performance. I’m using Windows 10 and the latest version of Firefox.

Could anyone suggest what settings or troubleshooting steps I can try to fix this slowdown?

suse linux 15.6 firefox 140.9.0esr (64-bit)

An aggressive website can cause "isolated web co" processes to be started. When they hog all processors and memory, the computer besomes unresponsive. Keyboard and mouse freezes up.

Is there a way to limit firefox processes to n-1 processors, leaving 1 processor available for me to kill it ?

I love Firefox and have used it forever. But its memory usage is killing me lately and I'm seriously reconsidering.... PC, Win11, Intel7, 16GB memory. (I'm typing this from Chrome)

I've updated, restarted, but it keeps maxing out and slowing my computer to a crawl. Somebody please tell me there's a fix pending?

Version 149. After about one day of use, Firefox on Android intermittently hangs for about five seconds, several times per minute. Attempting to select links during this time are ignored and the selection usually occurs after the hang/delay.

The device is a Pixel 5 with Android 14.