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}

You can check for issues caused by a corrupted or incomplete Visual C++ installation that is missing runtime components (Redistributable Packages) required by Firefox, especially VCRUNTIME140_1.dll.

See "Visual Studio 2015, 2017, 2019, and 2022":

• https://docs.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist
• https://aka.ms/vs/17/release/vc_redist.x64.exe
• https://aka.ms/vs/17/release/vc_redist.x86.exe

You may also have to install the Visual Studio 2013 Redistributable Package. You need to reboot the computer.

Thanks cor-el,

But...

“You can check for issues....”

Umm, actually maybe *you* know how to check. I have no idea how to do this. I can, however confirm that VCRUNTIME140_1.dll is installed.

“You may also have to install...” I may. Or may not. How do I determine whether I actually do?

Regards,

Steve

Thanks Fred,

I just TURNED OFF my firewall. No difference.

(

Regards,

Steve

I can, however confirm that VCRUNTIME140_1.dll is installed.

It's possible the program has problems. Use the posted links to install it again.

Installed 97.0 Rebooted Installed VC_redist.x64.exe Rebooted Refreshed FF

Still no joy. Never works in normal startup SOMETIMES works in Troubleshoot Mode; when it doesn't, it stalls with lots of background processes

Do you have Webroot Security?

Ahhh...

Yes.

I tried turning off the firewall with v96. But that didn't change anything.

Ill try it again (with v97). Any other ideas?

Quick preliminary update.

Turned off firewall. No difference. Completely deactivated it: Seem to be working (about 6 consecutive launches)

More soon....

Hunh....

https://community.webroot.com/webroot-secureanywhere-antivirus-12/webroot-blocking-firefox-97-0-64-bit-350229 "I have a partial fix for this. The issue is outlined in here but the important bit is that WRusr.dll is ccalling SHGetFolderPathW in DllMain.

"The partial fix is to install Firefox 98 Beta Nightly that was released last night.  Once I installed that Firefox 64-bit would load once again.  The reason I’m calling this a partial fix is because you’re having to use a nightly build and because Firefox is patching a work around for a larger issue that Webroot needs to address to prevent issues with other programs.

"The very reason I switched to firefox a year ago was because this kept happening with Chrome, other software making workarounds for a webroot issue is not good."

Or... get another security suite.

Props to TyDraniu for the heads-up, and to FredMcD and cor-el for valiant attempts.

Steven

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution.

Thank you for contacting Mozilla Support.

What also seems to work is to uninstall and reinstall Webroot.

Uninstalling, rebooting, and reinstalling Webroot resolved the problem, confirming other online reports.

I used an install/uninstall problem (Revo), which cleans up leftover files and registry entries. It’s been suggested that this is important for ensuring the fix works. If you don’t use an uninstaller, instructions for manual clean-up can be found here: https://community.webroot.com/community-101-2/not-working-345896

Regards,

Steve

https://www.mozilla.org/firefox/97.0.1/releasenotes/

Fixed Works around problems with WebRoot SecureAnywhere antivirus rendering Firefox unusable in some situations