Diễn đàn hỗ trợ Firefox

When trying to access many popular websites with Firefox on my Fedora 43 installation, I am greeted with a security warning page with the SEC_ERROR_UNKNOWN_ISSUER error. For most of these websites I can simply accept and continue, but HSTS-only sites will not permit this.

Affected websites include but are not limited to (based on exceptions in the certificates section of Firefox settings):

• github.io (many subdomains)
• purdue.edu (many subdomains)
• iu.edu
• ebay.com
• cbsnews.com
• iwm.org.uk
• home.cern
• celestrak.org

Any help in resolving this is appreciated.

I always have two windows of Firefox open, one for each monitor. Up until recently Firefox would always restore both windows exactly as they were before I right clicked the Firefox icon in the taskbar and clicked "close all windows". This week however my browser will only restore one of the two windows I had open, and I have to restore the other one manually which is annoying. Can anyone help me bring back the old behavior so it restores both my windows every time?

Dear Firefox Team,

It has re-occurred to my Firefox Browser of the latest version of 115.28 with some websites which I have recently visited however which have appeared 8 grids of blank or white pages again under "Recent Activity" as attached with the image for your technical troubleshooting suggestion.

Those 8 grids of Recent Activity in the older version of Firefox browsers used to have shown colorful graphics or images representative of the recent websites I visited in the recent past.

May I know what I am supposed to do to recover those graphics or images?

Kindly offer any suggestion or solution?

Thank you for your kind attention.

Mr. Topaz Chiu

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter]

i dont know if its a strange font or another problem, i have copied all "font" setting from my other pc where i dont have the problem.

also i cant get spell check to work here dsespite turning it on

its very distracting, would be very gratefull for any suggestones if any one can 

help thanks

Every time I boot Win 10 Pro, a half dozen Firefox pop-ups complain as indicated, as well as the wrong google page login (Voice instead of Calendar). There is no Firefox showing in the Windows>Task ManagerStartup> list. Firefox(143.0.4 (64b))> settings>General> Startup> has only [check for default]. I cannot find the controlling 'Startup' controls.

hi team, recently i can not open any PDF when i am in gmail using Firefox Browser is updated to latest verison, i have also check settings under application and whatever i choose, when click in PDF in my gmail, i can not open it directly, i need to go right click on it, open in new tab, then it downloads to my PC and open in new tab?. stupid isnt it? i have tried many settings and nothing seems to be working, any chance that i can just click on PDF and it opens in new tab or my Adobe app, without download it to my PC, cause sometimes i just want to see wtf is the attacment...

cheers,

The newly added PWA support is neat and was much needed. However there is an issue with the PWA icons under Windows, in the Start menu. In the all programs tab the icons are correctly the icons of their respective websites, but if the icon is pinned as a tile it switches to the default firefox icon making it hard to tell them apart at the first glance. The issue is present under Windows 10 and also Windows 11 How to recreate: Win10: -add a tab to the taskbar as a PWA -open Start menu -pin the PWA Win11: -install ExplorerPatcher and change the useless clunky win11 Start to the almighty and productive win10 Start -add a tab to the taskbar as a PWA -open Start menu -pin the PWA

Is there any way to fix the icons of pinned PWAs?

I'm having trouble installing Norton Password Manager, I keep getting a corrupt file, won't install, so I am running through the checklist of possible fixes.

The one I am up to is this :-

Refresh Firefox Click the menu button (≡). Select Help, then choose More troubleshooting information. Click the Refresh Firefox… button on the right side of the page. In the confirmation window that appears, click Refresh Firefox. Firefox will close and restart. When it finishes, a window will show the data that was imported. Click Finish. Choose whether to restore your previous windows and tabs, then click Let’s go!.

I cannot find the "Refresh"

I've run Troubleshoot Mode

I have cleared the startup cache, problem not fixed.

https://drive.google.com/file/d/1Xc4TJomqETKUOMIa9y1IgVD_alu_dIlg/view?usp=drive_link

When I do "save as " action for an image in the browser it opens dialogue window to save selected image. Unfortunately it displays files and folders in some random order, rather than my preferred order (sorted alphabetically by name, followed by sorting by type).

I can see no rhyme or reason to the way Firefox lists files and folders in the dialogue window, so every time I am saving an image I have to sort things by name and type before I can find what I want.

This is not permanent so I have to repeat this action every time I save an image.

How do I, please set application preferences? to make this setting permanent?

On Sunday October 5, 2025 I began experiencing an issue with gocomics.com. I thought it was a temporary one that would resolve itself. Monday morning it was still happening. I contacted GC thinking the issue was on their end. They were unable to replicate it. They asked me to try to go to the site using the private window on FF. I was able to access it just fine. Therefore, we know it is not GC. I was also able to get to their page on Chrome.

I tried again on Tuesday. Same issues. I had already read on some forums where others were getting the same loop that I am: https://amub2c.b2clogin.com/amub2c.onmicrosoft.com/B2C_1A_GC_SIGNINSIGNOUT_POLICIES/oauth2/v2.0/logout?post_logout_redirect_uri=https://www.gocomics.com

It was suggested to try refreshing FF. I did that. Didn’t work. Gave up again for the day.

This morning, I tried uninstalling FF. Didn’t work. What else is there left for me to try?

After a re-start, my Firefox browser on a Dell laptop lost all history and has since also not been collecting websites visited. When opening a new tab, the shortcuts and recently visited websites are also gone and no longer being collected. My CCleaner recently updated itself to a new version but I unchecked the delete history for Firefox (which treacherously is clicked by default - I fell into that trap before). Happy to blame the new CCleaner but that would not explain why history is not being collected now - to me the fault seems to lie with Firefox instead. Another possibility that went through my mind: Is Microsoft sabotaging users of Windows 11 to force them to buy new? PS: Under "Privacy", "History", the setting is "Firefox will remember history", as it always has been and should be. But it has forgotten all previous history and it is no longer collecting any new history either!

Hey folks, I recently installed a new NVME, clean Windows install, clean Firefox install. Recently I've had seemingly random crashes on tabs, happened a lot with YouTube and seems to happen fairly consistently if I go to my watch history. Other sites seem okay, everything else seems to be working fine, checked my drive, my RAM. This Firefox install is using my Mozilla account for passwords and themes. Included a recent crash report if that helps. Thanks if any of y'all can help

https://crash-stats.mozilla.org/report/index/863d30db-00fe-4761-abfe-197250251010#tab-details

Firefox 143.0.4 (64-bit) on fully patched Windows 11 has an issue with FIDO2 keys, specifically YubiKeys. The keys will register, but then a window will pop up and ask if we allow that access. I allow the access, the key gets registered, but then when I attempt to use the key, it fails. If I try it in a different browser, the key works fine. Hope the devs see this.