Forum der Gemeinschaft Firefox

Am not being hyperbole but I swear to God I love Firefox more than anything. Okay, let's get to the main topic. I have a problem with Firefox on my pc, whenever I open Firefox one of my CPU thread is dying and its causes brutally lags. I know I have a potato rig but at least fix this browser as smooth as before. After I having a problem with dying threads whenever I open a tab and going to a website I desire it took so long isgt. I thought my pc was the problem one and I think "Ah I should upgrade my pc, but I still in debt" and it turns out the Firefox was the main problem.

Please Firefox fix this for me, don't suffer me more. I'm migrating to Chrome for a while cuz the Chrome didn't kill my CPU thread (I tested it for almost 2 weeks).

I attached you images from time to time, hope you could understand it! ;)

Hello! I am working on a brand new computer (i7 14700F, NVIDIA GeForce RTX 4070 Super, 32GB DDR5) with a brand new install of Firefox and sometimes it just won't load certain pages without me stopping it, refreshing, and then (most of the time) it all pops in. Browsing the web works perfectly in Edge, but in Firefox it has been a struggle. Some sites, like Discord, load VERY slowly and most of the time I need to force a refresh via shift and hitting refresh. Discord will take so long to load any image that I see it as a colorful blur before the photo fully loads in for view.

I'm running the most recent version of Windows 11, Firefox v137.0.1 (also had this issue with v137).

I have tried things in Troubleshoot Mode and didn't make a difference. I uninstalled Firefox, removed the %APPDATA%\Mozilla\ folder, and reinstalled but no change. What I haven't tried is Refresh Firefox, but that's because since Troubleshoot Mode didn't make a difference it's a bit hard to imagine Refresh Firefox will -- but if people think it's worth trying I certainly will give it a go!

I've been a FF user for as long as I can remember and I really don't want to give it up so hopefully someone can help me figure out what's going on here because I am currently at a loss and it's a big bummer.

Thanks in advance for the help!

Hi, I'm having some issues with Firefox. I'm opening a website (which I usually visit) even slower than with Tor at the same time. I'd love to know why and how to fix it.

some times the Youtube video's won't load i thought that it's my network glitch but my network is good only in this browser the videos won't load sometimes and some website's like amazon also won't load some times it keeps on loading but nothing will be loaded . i need to restart the whole browser to make it work please fix it Zen browser .

Hello Mozilla Community,

I’m currently using Firefox for my web design projects and facing some performance issues when testing websites built with modern frameworks. As a developer at DE IT SOLUTION where we provide website design and development services, I rely on Firefox for testing due to its robust developer tools.

However, I’ve noticed:

Firefox becomes slow when handling multiple tabs with live previews. Developer Tools sometimes lag during real-time CSS adjustments. I would love advice on:

Best practices for optimizing Firefox for web development. Recommended extensions that won’t slow down the browser. Tweaks for faster rendering of web pages during testing. I’ve explored Mozilla’s tips but would appreciate insights from this expert community. Also, if you’re interested in how UX/UI impacts web performance, you might enjoy this article from my experience: Why UX/UI Design Matters in Web Development (Sharing for learning purposes).

Thank you in advance for your suggestions!

I have tried several online suggestions to speed up page load on my Firefox browser. None have improved my situation. I can start a web page load on Firefox while simultaneously working from another browser. The other browsers load and I am able to complete my business before Firefox even loads. I am quite frustrated by this as I have used Firefox for as long as I can remember.

I am using Windows 11

I have been having issues for some time with my home page not loading after startup in the mornings. My default browser works fine. But Mozilla Firefox is not! If I shut down numerous times, or do a restart or go into my default browser, Firefox will load after an hr or two of repeated attempts! This has been going on since the last 3 updates. I have plenty of storage left on my computer. I have just done the latest update (134.0.1 (64-bit) - Windows 11. Can anyone throw some light on this issue?

When I try to download anything Firefox Caps my download speed at 10MB/s Other browsers don't. I tried, Edge, Chrome, Etc... they all give me access to my full Gigabit speed. I've attached 2 screenshots with a SpeedTest comparison.

Firefox: 90mbps Edge: 630mbps

my firefox is taking forever to load any type of page, and in addiition the thunderbird is also slow. I re-downloaded mozilla, but it is still downloading so skow. just last two days, and when I say slow like 2 minutes to open a page. HELP

Hi all! Happy Firefox user for over 20 years here. Recently I've had to switch to Chrome for one of my use cases, Google Cloud Monitoring dashboards. They're evidently JS- and data-heavy, and they're often unusably slow in Firefox. I often see delays of 10s or seconds when clicking any button or link, rendering data, or doing anything else. They also seem to get slower the longer their tab is open in the browser. They're way more usable in Chrome; maybe not perfect, but drastically better.

Any thoughts?

I've used about:performance to take a profile on https://profiler.firefox.com/, and uploaded it to share.firefox.dev , and I know it claims to sanitize personal info, but I'm still a bit leery of posting the link publicly. Happy to share it with a Mozilla employee if that would help.

updated to latest firefox 136.0.1 today and several web pages will not load on first attempt. yahoo.com, google along others indicate that page is preventing this site from loading. I have not encountered any issue with Chrome. Have not encountered this issue with firefox previously but very frustrated user. I any attempted to start firefox in debug mode without any extensions or tools and firefox still encountered the same issue. Any recommendation would be appreciated.

Why does it take Firefox so long to load after an update? sometimes it will take upwards of 20 minutes. ON some occasions I have to close the browser and start it numerous times!

For the last several days I've been having a problem with general slowness when accessing various bookmarks and/or searching in the address bar. I've disabled various extensions which I really didn't us a lot and the cache is kept clean. It also seems to using a lot of memory. Task manager was showing approx 750mb. I don't know if this amount is typical or not. I've tried a safe boot and it really didn't change anything. I would also mention that I'm not having these issues in either Chrome or Edge. I tried doing reinstall-not a clean one, but it really change anything. Any suggestions on how to proceed? Thanks

I'm running some devices with windows 10 and 11. All have same most current version of Firefox installed. There is no issue on Win10. With any Win 11 device, some pages as google.com take about 60s until they start loading. Once started the behavior disappears until restart of the browser (even tab gets closed). I'm using classic DNS (no DoH).

Here I've uploaded the profile: https://share.firefox.dev/4coxRg4

On Network it say's "DNS request 6ms", "after DNS request 60000ms".

With wireshark I can see different kind of DNS request on Win10 A and AAA gets request, on Win11 HTTPS gets request - no idea if that makes the difference as there in no delay in the response anyway.

Any idea how to troubleshoot this?

I seem to have an intermittent issue on a laptop with webpages not updating after the initial load if there is more to load.

To give an example, if I go to https://www.milkandmore.co.uk/dairy/c/yoghurt on the laptop, most of the time, it will only display 12 of the 26 items and not show the rest when I scroll down.

Works fine in chrome and edge though and when I scroll down to the 12th item, it loads up the rest every time. It will do so intermittently on firefox.

Hope that's explained alright.

Firefox is up to date. Tried disabling autoscroll and smooth scrolling but no joy.