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!!

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.

As I write I am seriously considering walking away from using Firefox and advising all my friends to not use it.

Every time a programme does a update on my desktop, which is several times a week, it crashes Firefox and I get endless messages all day to keep rebooting Firefox.

It is getting extremely aggravating, frustrating and making me very annoyed.

This is supposed to be a modern browser with no big issues, supposedly easier to use than others? not on my desktop it is not and has not been for several months.

I have followed suggested links in ever variable circles to no avail... innumerable deletes, restarts, reinstalls etc, etc.... but still have NO ACCESS to my Bookmarks toolbar! I've worked way too long over such & would gladly forget my history... but remain unable to access the Bookmarks toolbar

I have about 50 url’s on my address bar which open every time I login. I delete them one by one but next time they pop up again. I tried using the settings but no help. Any ideas how to stop them popping up when I login? This is something that only happened recently. Never before.

Firefox is up to date, Windows 11.

I frequently watch BBC videos but approx one week ago, they stopped playing. I have your VPN which is usually off as it give me no advantage, (this appeared following the last update), but I've tried switching on and changing to UK location. No change.

Can you give me some suggestions please?

Hello,

At the last FF update, I discovered that I had VPN on my top status bar but what does it do?

I have v. 150.0.1 (64 bit). Also Windows 11. I live in France and the only reason to use a VPN is to watch a UK soap which I cannot watch by any other means unless it's live on the TV. I know how to turn it on (obvious), so when I use the BBC website, this is what I do. But it makes not the slightest bit of difference as I am still recognised as being outside the UK.

Am I not doing something please?

I installed the English (US) dictionary add-ons from Mozilla Add-ons (English-US Dictionary and US English Dictionary). Firefox confirms they are installed and shows a “Remove” option, but they do not appear in about:addons under Dictionaries or Extensions. Additionally, the dictionary features are not working on webpages—there is no “define” option on text selection, and no dictionary/lookup functionality appears even after double-clicking words or using context menu options. The add-ons only appear as installed on their web pages.

Expected behavior: Installed dictionaries should be visible in about:addons and provide word lookup/definition functionality in the browser. Actual behavior: Add-ons are not listed in about:addons and provide no visible or usable dictionary features on webpages.

When I hit enter after clicking youtube.com , my screen turns into grey spots where the videos should show and no other written info on screen. What is going on??? I can go in when Safari or chrome.

I have used gmail including calendar and contacts with Firefox for 5 years, suddenly contacts and calendar will not open, has a Firefox upgrade caused this problem?

I asked about troubles with passkeys in Microsoft password manager, not Windows Hello. The question was denied. https://support.mozilla.org/en-US/questions/1585824

I am only a home PC customer and have Windows OEM vendor's support only. It supports operation mises about Windows OS and preinstalled applications, but doesn't support Windows's bug trouble shootings. I was denied supporting from FUJITSU CLIENT COMPUTING LIMITED (known as a Japanese company, but a subsidiary of Lenovo now). I copied the raw Japanese text to avoid my failure of translating.

==

パスキーのご利用について、お問い合わせをいただいております。

はじめに、恐れながら弊社では、出荷時に搭載されている OSおよび、一部のアプリについてのみ、動作確認をしております。

そのため、[Firefox]については情報を有しておらず、具体的な ご案内を差し上げることが困難です。

[Microsoft Edge]でご希望の操作が可能な場合は、こちらで ご利用いただくことをご検討ください。

なお、[Microsoft Edge]でも同様に問題が生じている場合は、 お手数ですが、[Microsoft Edge]で発生している状況や、 実施されたい作業の内容についてお書き添えいただき、再度 FMVテクニカルセンター(メールサポート)へご連絡くださいますよう お願いいたします。

==

By the answer, I lost any support about trouble shooting.

I ask questions. Have Firefox development team previously confirmed that it works? Does you have Bugzilla ID about functionality check with passkeys in Microsoft password manager or something like it?

I had an unusual system crash, and when I restarted Firefox, the History > Restore Previous Session feature was grayed out. Due to the nature of my work, I had a large quantity of tabs open at the time of the crash (please don't judge). I then backed up the contents of the \Library\Application Support\Firefox\Profiles\[session].default\sessionstore-backups\ folder, but unfortunately not the full Profiles folder content. The file recovery.baklz4 does seem to contain my open session info (I can see a recent link in it). Based on web advice, I then tried restarting Firefox, but that didn't solve my issue. I also tried copying in sessionstore-backups files, without success. I then tried the "Session History Scrounger" web application to try and recover links from the contents of recovery.baklz4 because that worked for me in a prior crash years ago, but it doesn't seem to work properly anymore (it only retrieved 4 web pages). Appreciate any guidance as to how I can use my backed up sessionstore-backup files to re-enable Restore Previous Session, or alternatively to scrounge the links that were open at the time of the crash. Greatly appreciate your help! (Please do not suggest using "Show All History"... I have no plans to sort through a dump truck of rice with a pair of tweezers.)

Hi there. Ian here. My home page "www.news.com.au" keeps wanting to lock me out due to apparent addblockers on my PC. I am not aware of any that I have installed and can't find a way to remove them or turn them off. I am also not sure if this is a healthy consideration in any case. Can you Help me please.

macOS 26.5.1 Firefox MAC: 151.0.4 (aarch64)

reCAPTCHA keeps re-appearing espcially after I just cleared recent history in firefox mac And I tried a few things but so far no luck.

Does anyone have any idea how to prevent reCAPTCHA ?

Thank you.

no matter what website when i put on a video it fades between normal and black constantly i dont know if its my computer im not very good at tech it doesnt happen and never happened on google