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Hi everyone,

I run a construction estimating construction estimating website where we share project-based cost estimates and detailed breakdown for contractors, architects

I’ve noticed a weird issue in Firefox lately.

Some of the heavier pages (especially ones with large tables, detailed breakdowns, and embedded content) start getting really slow or sometimes even become unresponsive in Firefox. The same pages load completely fine and smooth in Chrome, so I’m trying to understand what Firefox might be struggling with specifically.

I already tried the basic stuff like clearing cache, testing in private mode, and disabling extensions, but the issue still keeps coming back.

It seems more noticeable on pages with a lot of structured data and embedded elements, so I’m wondering if it could be a rendering, memory, or layout issue on Firefox’s side.

Has anyone dealt with similar performance issues on Firefox with data-heavy or content-heavy web pages?

What should I look into next — layout structure, CSS rendering, JS execution, or something Firefox-specific I might be missing?

Any guidance or debugging tips would be really appreciated.

I have been using Firefox forever. It has been running very slow and bugging out especially with you tube on close. I've been working on this for a couple of weeks and am about to give up. My self built system is about 10 months old. Am using a completely debloated MS 11 pro 25h2. Did not ask for AI from Firefox and have disabled AI in Firefox and copilot is long gone. I have tried everything. Am about to quit firefox. Have refreshed firefox and prevented firefox from running in MS win 11 pro "efficiency mode". I usually have to exit firefox with task manager - there are usually 17 instances of firefox running. Mozilla has become Microsoft.

The system: Gigabyte B650 mobo, 32 gig of DDR5 6000, AMD 7700X processor and an Asrock 9060 graphics card with 16 gig DDR6 Vram. All other apps are running just fine. So I don't think a lack of compute is the problem.

Help please! Thanks in advance!

When i start fire fox it immediately opens 10 additional versions in the background which I can see in task manager and they take up a lot off memory. If i end task them they immediately come back. This only started recently. I noticed it because now when i open say a youtube video it shows it as number 4. This never happened before unless I had the same video open more than once.

If I can not stop this I will have to uninstall.

Hi,

I am using macbook pro latest one, and when I use firefox and scroll down from my wireless Mouse to the bottom of the page, the scroll bar jumps to the top while working, is there a fix for this.

Thanks

Been using Firefox for over a decade. But lately is has become so slow now. Often freezes up if more than two tabs are open or a website is in any way very complex. What settings and issues should I check? What has changed? I can run the same sites on Brave and Edge browsers with no issues or not nearly as slow and bogged down.

Running Mozilla 151.1 (72455) on iPhone 13Pro Max using iOS 26.3.1 (a)

Anyone else experiencing the following?

If I am browsing any web page in private mode, then tap the "+" to add a new private window, I can not get to / tap on the navigation bar to type a URL. It ceases to be an input field. I have to exit the browser completely and start anew.

Windows 10 Open Firefox (151.0.2) Google "does alton towers still run in the rain"

My CPU then goes to 100% continuously. Why, CPU occupancy has only gone up in the last few weeks. This happens in a lot of searches.

当把Firefox置于后台一段时间，甚至是很少的一段时间后，就需要重新加载页面，这个加载过程很慢，通常需要几秒至几十秒，大多数时候都在十几秒。 这对于一个移动端浏览器来说是严重性能影响，因为很多时候可能只是随手搜索一些东西，打开或加载过慢尤其影响使用感受。 像其他浏览器，比如我正在使用的其他浏览器Edge或X浏览器，基本上可以无论何时点开直接使用。

For a few weeks now, trying to to type anything while using Firefox on android mobile is an exercise in frustration and insanity. It makes me want to tear my hair out. I type part of a word, and then it suddenly adds the autocompleted word after the end of the letter I already typed. It also keeps screwing up after apostrophes: I type "The car is Jo's car" for example, and suddenly the cursor makes a space after "Jo", but the cursor moves to behind the "s". The end result looks like "The car is Jo' car"s

I'm not making this up, it literally happened while typing the above line and I decided to leave it like that for you to see. Typing in firefox right now is maddening.

Hi whenever I use my Google account to sign into websites (Google, ebay, YouTube, & anyother sites,) Firefox will become unresponsive, the window containing the tab i was using becomes unresponsive, sort of. - I can't click any open Firefox Tabs, - the red 'Close' radio button is greyed-out, so I can't close any tabs or the window - right-click is unresponsive, so i can't close tabs that way, but Command-W closes the tabs normally, but the others are still unresponsive.

- i can open a new Firefox window (with &/or without Tabs,) which works normally.

- & unrelated, but earlier, Firefox was running really slowly, Youtube videos were slowed down, but audio was normal, and scrolling was slow.

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.

When I try to browse the webpage still not show anything or loading about 30-50 Second before start loading. Sometimes it get freeze not show anything need to re-enter url.

When the screen rotates, many videos freeze and thereafter all videos become unresponsive (and even some elements of the Firefox UI stop responding to taps) until the application is closed and restarted. I have experienced this problem for at least a year now. Reddit is a repeatable example: going to any feed (such as r/popular with videos), playing one, and rotating the screen.

I turned off all battery and CPU optimizations for Firefox, which improves performance on videos somewhat, but does not resolve this issue.

Hi, I’ve been experiencing slow startup times in Firefox, especially when I have my Time calculator web app open. The browser takes longer to load and sometimes becomes unresponsive.

I’ve tried disabling extensions and changing my home page, but the issue persists. Are there any specific settings or troubleshooting steps in Firefox that can help improve performance when using online calculators like this?

Any guidance or tips would be greatly appreciated. Thanks!

How do I roll back an update that is not working on my system? I am very displeased with Firefox overall. You are a memory hog and no settings that I try help. Now, when I open a new tab Firefox freezes and I often have to close and restart, sometimes more than once. You are pushing me away from your product. I am now looking for a browser that is user friendly and compatible with my older computer (windows 10 is the most upgraded OS I can use). I hope to hear from you with a resolution soon.