Firefox Community Forum

I installed a dev version of Firefox to test a plugin.

Then I uninstalled the dev version, but now none of my profiles on the regular version work...

Please help me, I really need my old browser history and cookies.

When I try to use one of my old profiles, I get "You've launched an older version of Firefox" and it tells me to either Create New Profile or Exit.

I read online that people add "-allow-downgrade" to the Windows shortcut, but this does nothing for me.

Thanks you and please help!

Greetings: I'm getting an Intellius notification and advert pop-up that won't stop even after I touched "disable notifications from Intellius" on the notification. It began after going to Intellius website briefly the other day. I've clicked disable Intellius notifications several times to no avail. Thank you for any feedback.

Looking for help to try and work out what is happening. Over the last few days, after powering up and browsing the internet everything works fine for a while. Main websites are Facebook, YouTube and continually clicking on bookmarked items. Normally only a few tabs are open at any one time. Then after some time, I open a new tab and get the

Gah. Your Tab Just Crashed message appear on the new tab and can not access any websites after this. The Close Tab, Restore Tab, Restore All Tabs do nothing.

I have to reboot the PC and start again.

I'm using the latest version 126.0.1 (64-bit).

• Tried running in Safe Mode, uninstalled Firefox and re-installed it, reverted back to 126.0 (64-bit) and same issue.

• I've cleared the cache and history

• Had Add Blockers, FB Purity and New Tab Override Extensions. Disabled these and still no success.

• I have AVG driver update installed and its telling me all the drivers are up to date.

• The problem seemed to start happening after an AVG update, so I have removed AVG Antivirus

The computer is an ASUS Vivobook Laptop, Intel(R) Core(TM) i3-1005G1 CPU @ 1.20GHz 1.19 GHz with 8GB ram.

I have tried

Hello, Since yesterday, the Firefox web browser crashes systematically. This has happened well over a dozen times. I've tried multiple step-by-step solutions: deactivating extensions, troubleshooting mode, repairing firefox, uninstalling and installing Firefox, trying several versions of Firefox (Quantum, ESR, Nightly), downgrading to an earlier version, uninstalling and completely cleaning Mozilla folders on AppData, deactivating graphics/hardware acceleration...

At one point, Firefox was crashing after ten seconds of watching a video on Youtube or another platform. After reinstallation, video playback no longer causes the browser to crash, but closing a tab does.

I am currently using Mozilla ESR 115.12.0. After reinstalling, I lost all the reports I sent. Nevertheless, I was able to reproduce the crash to give you the ID: [https://crash-stats.mozilla.org/repor.../a2d0f5de-d03f-450b-88f8-a8fdc0240705] Another crash report : [https://crash-stats.mozilla.org/repor.../71c602f6-c682-4158-9880-24d6a0240705]

According to the crash table, the reason for the crash is as follows: EXCEPTION_STACK_BUFFER_OVERRUN / FAST_FAIL_GUARD_ICALL_CHECK_FAILURE This reason appears on all crashes.

Thank you.

Secure connection failed and Firefox did not connect Firefox Last updated: 01/16/2024 39% of users voted this helpful

This article explains why you may see a Secure Connection Failed or a Did Not Connect: Potential Security Issue error page, and what you can do.

   If you see a Warning: Potential Security Risk Ahead error page, see What do the security warning codes mean? and How to troubleshoot security error codes on secure websites.
   To troubleshoot other error messages, see Websites don't load - troubleshoot and fix error messages. 

Table of Contents

   Secure connection cannot be established
       Secure Connection Failed
       Did Not Connect: Potential Security Issue
   Website issues
       TLS version unsupported
       HSTS required
   Security software conflict
   Incorrect system clock
   Other secure connection issues

Secure connection cannot be established

When a website that requires a secure (HTTPS) connection tries to secure communication with your computer, Firefox cross-checks this attempt to make sure that the website certificate and the connection method are actually secure. If Firefox cannot establish a secure connection, it will display a Secure Connection Failed or Did Not Connect: Potential Security Issue error page. Secure Connection Failed

A Secure Connection Failed error page will include a description of the error and a Try Again button. There is no option to add a security exception to bypass this type of error.

Fx97SecureConnectionFailed ~~~ The url gives me this can you help please its not bitdefender total security blocking it I dont think https://support.mozilla.org/en-US/kb/secure-connection-failed-firefox-did-not-connect?as=u&utm_source=inproduct

macOS. Firefox is running. I enter: open -a Firefox --args -private-window "https://apple.com" (in Terminal or Automator) which I believe should open apple.com in a new private window, but although the focus change to the already open Firefox window, a new private window does not open. It does work (apple.com opens in a new private window) if Firefox is not already running, but I thought the -private-window argument is supposed to open a new private window whether Firefox is already running or not. What have I got wrong?

Hi MFirefox

I'd like to cancel Relay. I have been having problems with getting logged onto sites that I need quickly. This morning Norton would not let me on to see my privacy report.

Please tell me how to delete/cancel Relay.

Thanks, [email removed]@frontier.com

When I open Firefox (with administrative privileges) lt won't stay open, it just looks like it going to load my previous season (at least that's what should happen), but after a few seconds it just stops and closes, all at once? Also, I should mention; Firefox is updated, Using Windows 10. I've tried to trouble shoot a little . . .

— Reinstalled Firefox. — I manually delete the files in Startup Cache by navigating to the cache folder in your Firefox profile. — Reinstalling Microsoft Visual C++ 2015 - 2022 Redistributable x86 and x64.

Now, at one point it did open, and I decided to refresh Firefox (removing extensions and restoring to default settings) by going to 'More troubleshooting information' option, then clicking the Refresh Firefox button. Closed it, restarted my laptop, and Firefox, added my usual extension / add-on. (I was thankfully able to save my bookmarks or back them up).

When I was done, I closed it. But when I try to open Firefox, lt won't stay open, it just looks like it going to load my previous season, but after a few seconds it just stops and closes?

Should I just remove Firefox all together from my laptop, and reinstall it??

Firefox periodically says I am "forbidden" to enter my Kaiser website (KP.org). I know what Mozilla recommends as a fix, which is to clear data and cookies. But this creates more problems because I have to re-enter passwords and other settings. This is a problem Mozilla's website reports has been occurring for YEARS! Why can't Mozilla/Firefox fix this? Please tell me there is a better way to fix this problem.

David Karp dkarpcal@gmail.com or cloverdavid@gmail.com

Hi, i have problem with uninstalling uBlock Origin i cant remove them from extension tab. I tried refreshing firefox, reinstalling, opening firefox with troubleshoot mode and still nothing i dont know why is so difficult.Even when i reinstalling firefox this addon onstalling by itself even when im not logged in.Please help me. Thanks

Dear Sir or Madam,

Once again, Firefox is blocking my ability to go into X (Twitter). I'm guessing you guys did an update and changed the settings again. PLEASE FIX. Thank you.

Sincerely, Britt

I've attached images of the problem I'm experiencing. Its like pixels are breaking/turning negative colors and it effects anything visible. I don't really understand what's causing this issue. It doesn't effect any other program on my computer/outside the firefox window, so I assume its a firefox issue. I've uninstalled/reinstalled the program with the refresh to hopefully fix the issue but it didn't work.

Hello, Today I was writing a draft post on Substack and the screen refreshed every few seconds. Possibly when Substack was saving changes. Each time it did this, the screen would go blank for an instant and refresh, and then I would have to click to place my cursor where it had been.

This is new as of this week. I was not writing on Substack using Firefox last week.

Firefox version 128.0, on Windows 10 Home v 22H2

thanks Chris.

When I open my youTube home in Firefox browser is completely blank nothind is showing I don't have this problem in other browser. I have tried in the settings to turn the history on and off but nothing has changed.