Firefox Community Forum

Both Mozilla products spontaneusly disappeared from my computer. Firefox requested a reinstall, and all was recovered. Firefox completely disappeared, and I had to restore from backups. I am seriously worried. What is going on?

Bruce Caress

May 7, 2026, 15:17 CST

Hello, I've been watching MSNOW at 4pm eastern and after about half an hour it crashes. I get a message to send a report and restore the tab. I restore the tab which works for maybe ten minutes and crashes again. I am using Windows 11 on a new computer. I'd appreciate some assistance. Thanks. Bruce Caress

Moderator note: This question has been edited to precise Firefox and OS version, based on the crash reports.

For quite some time now, I am unable to sign in to my account at CanadianTire.Ca I get an error. The signon process goes to CustomerAuth.Triangle.Ca for the email and password input. When I click "Sign In" the return message is a yellow triangle followed by the word "undefined" (see attached).

All other browsers I have (Brave, Chrome and Edge) can sign in without issue.

I noticed that other users have the exact same issue. I have tried all solutions I could find. The browser is up to date as of today (150.0.2 64 bit). I tried troubleshoot mode, clearing the cache, deleting cookies, history .... On the web site I turned off ETP for CanadianTire.Ca and CustomerAuth.Triangle.Com.

I have used Firefox since it was v0.93.

H E L P ! ! !

Why has  << teaseyourmatch.com >> opened its webpage yesterday & for several months while; today it won't load the homepage whatsover? This is an adult dating website from Eurozone w over 125000 users

How do i get my original profile page to always open when i open firefox instead of a new page without my bookmaks. This started right after my visit to Mozilla so i must have changed something. I don't know what!.

Hi,

Recently I have a problem with toolbar and in the Firefox browser. Usually I have 3 display (display from laptop and two monitors). When I use Firefox browser on the main display the toolbar very often is not working correctly.

Mainly the problem is with the folders inside the toolbar, so when I hover any folder, the bookmarks saved in that folder don't appear or appear for just one/two sec, then they disappear.

The second problem is when I have the firefox open on the second display (or on the laptop display) and I moved any tab (only the tab, not entire Firefox application), then my toolbar shows only the first bookmark that is saved on my list.

In attachments I added two ss (one is with my normal view on toolbar, and the second one is with the only first bookmark)

When I click Bookmarks > Manage Bookmarks I'm taken to Other Bookmarks where I never store anything. I'd delete it if I could but it doesn't appear to be an option, so instead I'd like to taken directly to Bookmarks Menu. I came across this post from just over 4 years ago which sounded like it's exactly what I want, but it doesn't work. Are there any changes anyone can suggest that would allow it to work in 2026?

https://support.mozilla.org/en-US/questions/1373437

You can use the autoconfig.cfg file in the Firefox installation folder to initialize (set/lock) preferences and run privileged JavaScript code. In this case code to open the Library with the Bookmarks Menu folder selected. You can modify the showPlaces variable to open any of the four possible root folders (in this case [1]).

To use Autoconfig, place two files into the Firefox installation directory.

   on Windows and Linux, they go into the same directory where Firefox is installed
   on macOS, they go into the Contents/Resources directory of the Firefox.app 

The autoconfig.js file that specifies to use autoconfig.cfg is placed into the "defaults\pref" directory where the channel-prefs.js file is located.

The autoconfig.cfg file is placed at the top level of the Firefox directory.

   autoconfig.cfg and autoconfig.js need to start with a comment line (//)
   autoconfig.js needs to use Unix line endings (LF instead of CR/LF) 

See also:

   https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig 

Content of autoconfig.js

//
pref("general.config.filename", "autoconfig.cfg");
pref("general.config.obscure_value", 0);
pref("general.config.sandbox_enabled", false); // disable sandbox to allow privileged JavaScript

Content of autoconfig.cfg

// first line in autoconfig.cfg is a comment line try {

let {classes:Cc, interfaces:Ci, manager:Cm, utils:Cu} = Components;
var Services = globalThis.Services || ChromeUtils.import("resource://gre/modules/Services.jsm").Services;

function ConfigJS() { Services.obs.addObserver(this, 'chrome-document-global-created', false); }
ConfigJS.prototype = {
 observe: function (aSubject) { aSubject.addEventListener('DOMContentLoaded', this, {once: true}); },
 handleEvent: function (aEvent) {
  let document = aEvent.originalTarget;
  let window = document.defaultView;
  let location = window.location;
  if (/^(chrome:(?!\/\/(global\/content\/commonDialog|browser\/content\/webext-panels)\.x?html)|about:(?!blank))/i.test(location.href)) {
   if (window._gBrowser) {
     let showPlaces = ["AllBookmarks","BookmarksMenu","BookmarksToolbar","UnfiledBookmarks"][1];
     elm = document.getElementById("Browser:ShowAllBookmarks");
     if (elm) {
      elm.setAttribute("oncommand", "PlacesCommandHook.showPlacesOrganizer('"+showPlaces+"')");
     }
   }
  }
 }
};
if (!Services.appinfo.inSafeMode) { new ConfigJS(); }

} catch(e) {Cu.reportError(e);}

I have my credit card info correctly saved in the FF settings on my PC desktop, but it doesn't work correctly on some online forms.

When it fails to work I click on the truncated information for the saved credit card I wish to use, but it fills in later numbers in the sequence incorrectly with the wrong digits and too few numbers to even be a legitimate credit card number

I have double checked in the settings, "privacy and security", and the credit card numbers are entered correctly there and enabled.

The form I have most recently had issues with were for a local "big day of giving" site, and it is powered by something called "mighty cause."

I can't include a screenshot of the issue itself occurring or my settings, for obvious reasons.

My PC is windows 11 home edition, and the version of Firefox is 150.0.1 (I think).

A couple days ago I started getting a blank page for the Firefox home page. FF is set as my default browser and FF default for windows and tabs. The home page was working fine but now I can't figure out how to get it back.

bold text On brand new DELL Alien-ware laptop with Windows 11 Firefox sometimes takes 30 seconds to open, Also once it is closed it cannot immediately open again. Error message shows Firefox is already opened and asks me to close it.

In the task manager under Apps running I see Firefox(12) when only the home page is open. Are those 12 hidden tabs or 12 parallel applications?

Have I made some errors in the Setup?

I am running 150.0.1 on Debian with Cinnamon. I set the fonts to use for Chinese to a custom fonts, where I left Latin fonts to use untouched, I found I must set Latin to use my custom Chinese fonts in order to display Chinese webpage properly, where the English fonts will get out of place, extra spacing in Apostrophe for example, "It's" will become "It 's", this is particular trouble when viewing on Youtube. But I set to use the same custom fonts on Chrome both English and Chinese displayed perfectly.

I have noai.duckduckgo.com set as my default search engine. Almost always (but not quite every time) when I type anything into the address/search bar, I get a page with a "Server Not Found" error. (See attached image.) Refreshing the page immediately brings up the results without issue, but I consistently get the error first.

Oddly, if I go into settings and switch to a different search engine and then switch back to duckduckgo, the issue will briefly resolve and it'll work fine for a short while... and then I start getting the error again.

Is there any way to fix this?

On all other browsers the drop down menus still show after first use, except in Firefox - where after first use they disappear and you have to go back to Home to re-show them.

I have tried the suggestions give for configuring the site iin Elementor/Wordpress but none have solved the problem and I can only assume the answer lies in Firefox settings.

TIA

Went to VRBO website to look at a reservation and the website, which showed me as signed in, showed nothing of the reservation. Said I had no reservation,, no history of saved searches. When I used Microsoft Edge, all my previous reservations, searches etc. were accessible. I cleared my Firefox cookies, etc. still had the same problem

Hi, it looks like Firefox can copy links from selected tabs, using right-click menu. It doesn't work for non HTTP(S) addresses though, such as "file:///C:/Users/USER/etc."

Is it possible for non HTTP(S) addresses?

The add on Export Tabs URLs by AL is very good, has the option for non HTTP(S) addresses, but I couldn't get it to work for selected tabs, is it possible for selected tabs?

i have had intego vpn for some time, historically i was able to use firefox and intego vpn to access web sites only after i had executed a shut-down and restart, not good but it worked if i needed, but there is now an inability for Firefox to establish a valid connection to any website when intego vpn is active, both firefox and mac-os are up to date

what do i have to do to get firefox and intego vpn to work together?

sadly intego vpn performed well with chrome but chrome brings it's own problems:)