What's your Firefox version?

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

• Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
• Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}

DM said

I have been having problems with firefox lately. Every time I try to run the program it automatically closes without giving an error message. I am running Windows 10 and this happens in safe mode as well. I have tried doing a clean install of firefox - that did not fix the problem. I tried deleting my profile after uninstalling then doing a fresh install, this did not fix the problem either. I ran a virus scan and did not detect any malware. I don't know what else to try.

Download the relevent 32 or 64 bit release of the previous version from the links underneath, select as per your language

32 bit at https://ftp.mozilla.org/pub/firefox/releases/70.0.1/win32/ 64 bit at https://ftp.mozilla.org/pub/firefox/releases/70.0.1/win64/

Should work fine, once installed go options disable automatic firefox updates for time being.

Hope it helps

hi DM, the symptoms sound very similar to https://bugzilla.mozilla.org/show_bug.cgi?id=1590430 - did you ever use comdo security products in the past or even if not, could you check if there's a file called IseGuard64.dll, IseGuard32.dll or similar located under C:\Windows\system32\ or your system drive? if so, delete it...

I never used Comdo. I downloaded the latest version of Firefox and still had the same problem even after doing a complete uninstall and starting with a new profile. Temporarily disabling my firewall did not fix the problem.

After fiddling around with system restore and affected programs I think I identified the program that is causing the problem. Only catch is that firefox will not work if I uninstall the program.

The program is WebCompanion. It must have been inadvertently installed as I never installed it on purpose. The puzzling thing is, if I uninstall WebCompanion Firefox no longer loads. Even if I delete my firefox profile and do a clean install after uninstalling WebCompanion the browser will not load.

https://webcompanion.com/en/

https://www.shouldiremoveit.com/Web-Companion-128861-program.aspx Web Companion by Lavasoft - Should I Remove It?

It’s very sad, but many software downloaders/ installers will trick you into installing not only their program, but other programs as well.

You have heard of the fine print in shady contracts, right? Well, some installers you need to look at the itsy bitsy teeny weeny fine print.

You are thinking you are giving the installer permission to install the program you want by using the recommended option. But if you use the Manual Option Instead, you discover all kinds of stuff that you do not even know what it is or what it does.

From now on, everyone needs to Use The Manual Option to put a stop to this.

Note that these programs can also change browser/computer settings

FredMcD said

https://webcompanion.com/en/ https://www.shouldiremoveit.com/Web-Companion-128861-program.aspx Web Companion by Lavasoft - Should I Remove It?

I'm not sure how to uninstall it without it disabling firefox. I don't even know why I can't use firefox after uninstalling WebCompainion.

Okay, let's do this.

First, get the full Firefox installer from; Download Firefox For All languages And Systems {web link}

Now, uninstall Firefox. Do Not remove the profile or settings.

Next, remove Web Companion.

After, reboot your system. When ready, run the Firefox installer. The installer should see that there is already a profile.

FredMcD said

Okay, let's do this. First, get the full Firefox installer from; Download Firefox For All languages And Systems {web link} Now, uninstall Firefox. Do Not remove the profile or settings. Next, remove Web Companion. After, reboot your system. When ready, run the Firefox installer. The installer should see that there is already a profile.

So I tried the steps you listed. I'm still having the same problem.

I called for more help.

Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Now in the Reply Box on the forum page, do a right-click in the box and select Paste.

This will show us your system details. No Personal Information Is Collected.

Okay. I had to revert to a previous restore point where Firefox is working, because I can not do the about:support without Firefox being able to load.

Application Basics

Name: Firefox Version: 70.0.1 Build ID: 20191030021342 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0 OS: Windows_NT 10.0 Launcher Process: Disabled due to failure Multiprocess Windows: 10/10 Enabled by default Remote Processes: 10 Enterprise Policies: Inactive Google Location Service Key: Found Google Safebrowsing Key: Found Mozilla Location Service Key: Found Safe Mode: false

Crash Reports for the Last 3 Days

Firefox Features

Name: Firefox Screenshots Version: 39.0.0 ID: [email protected]

Name: Form Autofill Version: 1.0 ID: [email protected]

Name: Web Compat Version: 6.4.0 ID: [email protected]

Name: WebCompat Reporter Version: 1.1.0 ID: [email protected]

Remote Processes

Type: Web Content Count: 8 / 8

Type: Extension Count: 1

Type: GPU Count: 1

Extensions

Name: Amazon.com Version: 1.1 Enabled: true ID: [email protected]

Name: Bing Version: 1.0 Enabled: true ID: [email protected]

Name: DuckDuckGo Version: 1.0 Enabled: true ID: [email protected]

Name: eBay Version: 1.0 Enabled: true ID: [email protected]

Name: Google Version: 1.0 Enabled: true ID: [email protected]

Name: Twitter Version: 1.0 Enabled: true ID: [email protected]

Name: uBlock Origin Version: 1.24.2 Enabled: true ID: [email protected]

Name: Video DownloadHelper Version: 7.3.7 Enabled: true ID: {b9db16a4-6edc-47ec-a1f4-b86292ed211d}

Name: Wikipedia (en) Version: 1.0 Enabled: true ID: [email protected]

Security Software

Type: Windows Defender Antivirus

Type:

Type: Windows Firewall

Graphics

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So, the only way I was able to resolve this issue is running firefox in windows comparability mode (Windows 8) even though I'm running Windows 10. I don't understand what's causing this problem.

Ask that question here (and post the link to it for us) https://support.microsoft.com

http://answers.microsoft.com/en-US/windows/forum/windows_10