Firefox Community Forum

Hi everyone,

I run a 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!!

When contacting my bank which I have been able to do for years I find that the login page of the bank opens and i put in the sign in details and send then nothing happens apart from the indicator just keeps on going round

Hey y'all.

I was messing with devtools before on my own site, and now whenever I go to tetr.io I keep getting "Debugger paused". Clicking the little "Deactivate breakpoints" icon in the Debugger tab in devtools changes nothing and it's still there.

tetr.io used to work on Firefox; I think when I was on 154 was when I last went on there.

When I play YouTube videos in Firefox, the video stutters and drops frames, even when set to 480p. The audio continues to play normally. This issue does not happen in Chrome on the same laptop.

The problem started about a week ago. I’m using Firefox on Windows 11. Restarting Firefox did not resolve the issue. I’ve attached screenshots for reference.

After signing into Amazon with firefox 43.0.1 (64-bit) browser on my mackbook I am not able to click on anything in firefox. I have to quit firefox and restart it before I can do anything. The even happens in a private window. Safari has no problems.

The Nvidia manual driver download page fails to complete loading, i,e, starts looping every 4 seconds never completing to select a driver download.

I'm running W10 with the extended MS security update.

Have had no issues like this previously in 2026 up to July 2026.

I have been trying for WEEKS NOW to sign into my bank! The bank can use a TEMPORARY password to access my account but once that's over, when I try to log into my bank I STILL CANNOT LOG IN!!!!!!!!!! WTF has happend to Firefox after that last "update" what ever it was they changed, made it IMPOSSIBLE for me to log into my BANK. The problem is NOT the bank it's FIREFOX & FIREFOX NEEDS TO FIX THIS CONNECTIVITY PROBLEM SOON IF NOT SOONER!

My javascript cannot detect the difference beween closing a new preferences tab and a new non domain tab. I believe this is for security reasons. This leads to one of my custom messages popping up when closing a non domain tab, which is not standard behavour on other websites on FireFox. If the user does or does not follow the popup instructions everything works fine. My question is: does this disqualify my website from being posted to the internet for FireFox browsing, or is it tolerable to users and to Mozilla? I have intentionally left out of this post technical information about my javascript. Believe me, I have tried countless ways to code my way out of this situation but due to Firefox's strong security measures, it is impossible. I should mention that perhaps if my script was an addon I would have accesss to the TAbs API which might offer a solution. The purpose of the script is to update the website to changes to the default Browser Zoom Level as found in the prefererence settings. Does anyone know if this purpose is compatible with FireFox Addon developement?Thanks so much for directing me to informed assistance. I hope the post is not "TMI"!!

The website fortunesultimateslots.com stopped letting me login on 8-3-26. I had been going to that site daily with no problem. No other website has stopped working on Firefox.

That site works for me on Edge but I would rather use Firefox.

Thank you for any help you can give.

As the title suggest - I am unable to access LI at all.

It's not a profile issue because it loads fine on Edge. It's not an extension issue because it causes the same problems in troubleshooting mode, and it does get me to at least the login page on a private window.

Please help. I'm not sure how to resolve this. It's blocking a lot of my work.

Thanks in advance!

When I try to open my mail in Yahoo I'm getting the following message" We couldn't load this message. There are no contacts on my list as well. I tried to read my mail on Google and it worked.

Hi. I'm taking an online course for HVAC certification. Some test questions require to arrange the answers in a logic sequence. When I try to move the answers up or down, they 'snap back' into the original (wrong) position. Is there a solution to this issue? I'm using FireFox with Linux Mint Cinnamon.

Greetings, Matt

A website that I have used for years to track my wine cellar invenory has ceased functioning for me. The Web Designer tells me that the problem is a network issue and not his problem. I get no solutions from my ISP.

When I attempt to load the page and look at the Console I get the following error message in response to several GET requests:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://cdn.ct-static.com/dist/js/ct.min.1530c2da96.js.

A web search tells me that this policy is a browser safety net. Any suggestions for troubleshooting?

when i login my google account on firefox they say this browser is not try another browser. and if you already use supportive browser then try again and if click on try again and try it they still show me same statement.

Ok, this happens every so often. I use a Laptop running up to date Win 11. For the last several days, when I try to get on Facebook, Firefox doesn't log me in all the way. Pages are just frozen and I can't do anything. I back out, I reboot, but nothing works so just now I logged into Edge and am just flying around Facebook! I have changed nothing so it is not me or my machine. Why does Firefox do this? I love it and have used it for years but this drives me crazy!! Thanks

I’ve noticed the bloxstrap download page doesn’t load smoothly in firefox, while it works fine in chrome. sometimes the buttons don’t respond unless I refresh. Is this a caching or compatibility thing with firefox?

Please create a new version of the browser app that supports the ability to use FileSystemAPI on directories, this is essential for working with a BeatBuddy project and SD cards that are saved on my computer using the online editor.

^ that's from SingularSound website that blocks your browser :(