Firefox 社群討論區

Several weeks ago Firefox worked normally for me. I left for most of the day and when I got home Firefox no longer worked at all. Everything on my home page was gone and when I typed in websites - such as my e-mail program or Facebook, nothing ever came up. I'm not super browser savvy, but I opened the menu and under help was "trouble shooting mode". I didn't know what that was but figured nothing much more could go wrong with Firefox, so I chose that. I had to rebuild the websites I had in a row on the middle of the page. I didn't lose bookmarks, but everything else was different. So I left it that way.

Earlier today, Firefox wanted me to do another update. I thought maybe by agreeing to that, things might return to normal. Noooooooo. It's no better whatever. Now I don't know how to get out of troubleshooting mode to know if anything will work normally again.

I am seriously considering switching browsers, but I have a LOT of stuff bookmarked and that would be very intensive to build all those book marks in another browser.

Ever since I got 133.03 my Dell cpu freezes a lot. Over the last hour it froze 15 times. This is terrible reliability.

I hired Dell Tech Support and they checked my software and there were no issues. I have run advance Norton features and there are no problems. Therefore the issue is NOT with my 20 month Dell computer.

Firefox has always been reliable until late August. For four weeks it would freeze and lock up. by the end of Sept it was slightly better and then fine in November. Now it only freezes, put the mouse over the image and it freezes. Play with it for a while and it unlocks.

I am totally fed up with Firefox. I'll be starting my taxes soon and year end things and can't afford to have all these issues and rebooting to help eliminate the issue.

When is Firefox tech support going to help me? When is Firefox going to fix the issue? After Christmas I am looking into the Microsoft software......enough is enought!

Gmail is slower than frozen molasses, it is taking 15 to 20 seconds to respond to mouse clicks and typing as well as scrolling, it takes me more than half an hour to do what should take a few minutes, if this is not fixed soon that will be the end of Firefox for me, I will use Opera instead.

I'm using Firefox 141.0 on OpenSuse Tumbleweed with KDE and Wayland. I'm using Firefox with two profiles: work and personal - which is (usually) awesome, until suddenly it's not.

Then, one or both profiles seem to become corrupted, and closing firefox, opening it, choosing either profile just hangs forever. My old tabs show up, but clicking on any tab, for any site, just hangs forever, and no page is ever loaded. Sometimes restarting helps, but sometimes not. Sometimes restarting 2 or 3 times and then suddenly it will work. But normally, I have to just delete all my profiles, and re-create them. Fortunately everything is synced with Firefox sync. Then everything will work wonderfully for a bit - although I have to re-login to everything.  :-(

Any ideas? This is a huge pain and productivity killer. I really love firefox, but this sucks.

I noticed recently that my Firefox changed, now when I click on the search/url bar at the top of the screen it opens into this full window sized search bar that sits at the top of the screen which is really bothersome. I also noticed that the close and minimize icons which are normally at the top right of the screen moved to be pushed inwards. I cannot tell if this is some issue with my Arch install, or a theme, but I tried switching to other themes in Firefox that do not use the system stuff and it seems to still be an issue? Could it be something else? I am totally at a loss as to what caused this and how to fix it, if I need to do something else on my system I can do more troubleshooting as well. (I have included two screenshots showing what I mean)

Sorry for my language.

The latest versions of Firefox 141 (and 142 beta 1) do not allow the Windows taskbar to appear when I move the mouse to the bottom of the screen. This happens on Windows 10 with the auto-hide taskbar setting enabled. In previous Firefox versions, this worked fine (except for one older version where it briefly broke). I’m not running Firefox in fullscreen mode, and I have no modifications or themes that could interfere. I tested this on a fresh, clean installation of Firefox — the issue still occurs. After downgrading to versions 140 and 139, everything works correctly again. Interestingly, I also tested the Firefox 141 Release Candidate Build 1 from here: 🔗 https://ftp.mozilla.org/pub/firefox/candidates/141.0-candidates/ In that version, the issue only occurred in private browsing mode. Could someone please help me resolve this or confirm it as a bug? Thanks in advance!

When I click the Firefox icon on my taskbar, it apparently starts OK, but in a second or so the window dims (See first attached image). This window doesn't allow any typed input anywhere, and doesn't close when I click the X in the upper left. This window can be made to go away either by using the Task Manager or by right-clicking on the taskbar icon and selecting Close Window.

However, if I right-click the taskbar icon and select Open New Window, the resulting window appears undimmed (Second attached image) and works correctly.

The above behavior is new; I've used Firefox for years with no problem.

The other user on this machine doesn't see this behavior at all.

https://www.mlb.com/gameday/braves-vs-nationals/2025/09/17/776286/live

this site at mlb.com or any site showing a live game eventually freezes up and cannot be closed normally. task manager or re-boot is only way out, starting over with a new instance of firefox after ending all firefoxes.

this has been happening just this past few days, after firefox updated to 143.0 on windows 11 using defender, no other screwed up security software.

firefox needs to fix this, it is not likely anything with the site but rather with firefox latest update, as this has always worked before on this same computer.

Dennis Coleman

When I launch Firefox in Troubleshoot Mode and try to open the Settings page (about:preferences) right away, Firefox becomes unresponsive. This issue does not occur when Troubleshoot Mode is off.

I'm using Firefox 140.0.4 on macOS Sequoia 15.5.

Hello,

I have several PC;s but all suffer on occasion absurdly slow performance when a Firefox update is released.

I may be wrong but it appears there are too many of these processes running, I tried changing the value in " about:config " but Firefox defaults the value back to " 12 " when the browser is restarted.

" app.normandy.migrationsApplied 12 "

The below details are from a small, new cube pc that runs great, it is slow but does perform well, even previously just the other day running multiple Live Youtube streams with no issues, until now. :)

Any help would be great. Thank you!!!

" Firefox 142.0.1 (64-bit) "

Device Name Garage Processor Intel(R) Celeron(R) N4020 CPU @ 1.10GHz 1.10 GHz Installed RAM 4.00 GB (3.83 GB usable) Storage 58 GB SSD VID:32 MMC64G Graphics Card Intel(R) UHD Graphics 600 (128 MB) Device ID C12EB49A-0C22-41C3-A8E6-4420E4A419B0 Product ID 00330-50441-82637-AAOEM System Type 64-bit operating system, x64-based processor Pen and touch No pen or touch input is available for this display

when i open firefox and have one tab open, doesnt matter what site it will freeze and i go to task manager and it says i have 15 open and ill end task and open again and it will say more or less

Ever since this month's Windows 10 update I've been having problems with Firefox. I start it, the menu bar and tab comes up, but then nothing. I can't access any web sites. I tried removing the Windows update, then tried uninstalling and reinstalling Firefox, and then messing with the settings. In each case Firefox would work for a couple of days, then I'd have to start it three or four times to get it to work, then it wouldn't work at all. I've been using it for 10 or more years now (four on this computer) and have never had any problems before. I'm loathe to switch to another browser, but if this can't be fixed I won't have any choice. This is what happens when I start the program.

Description: We have encountered a significant performance issue with NativeMessaging API in Firefox when an extension communicates with a native application.

In scenarios where many objects must be enumerated (e.g., ~458 certificates), Firefox is dozens of times slower than Chromium-based browsers.

Environment:

Firefox (latest stable, reproduced in 2025)

Windows 11 x64

Same machine and same native plugin tested in Chrome, Edge, Yandex Browser

Steps to Reproduce:

Create a WebExtension that communicates with a native application via NativeMessaging.

Perform enumeration of a large number of objects (≈ 450–500).

Measure execution time in Firefox vs Chromium.

Actual results:

Firefox: enumeration of 458 objects takes ~2 min 30 sec

Chromium/Edge/Yandex Browser: enumeration of the same 458 objects takes ~5 sec

Additional tests: Round-trip time (RTT) for a single message:

Firefox: ~73.7 ms

Chromium: ~0.3 ms

Because the extension and the plugin exchange a large number of messages, this performance gap becomes critical.

Expected results: NativeMessaging API in Firefox should perform at a level comparable to Chromium browsers, so that extensions relying on heavy message exchange remain usable.

References: Bug 1288912 – Native messaging performance is extremely poor

Although this bug is marked as resolved, performance testing still shows a major discrepancy in the current versions of Firefox.

Question: Is there any ongoing work or plan to optimize the implementation of NativeMessaging API in Firefox to address this performance issue?

Hello Firefox Support,

Since the latest update of the Firefox browser, I have been experiencing frequent freezes. The browser becomes unresponsive when performing basic actions such as:

• Clicking on the menu

• Closing tabs

• Copying or editing the URL

When this happens, the only way to recover is to close Firefox and reopen it.

Could you please advise on how to resolve this issue?

Thank you for your support.

Best regards, Mohamed Adel