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Firefox refuses to open

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Attempting to open Firefox in any way pulls up a white box as if it's about to open for a split second before immediately closing. Refreshing, uninstalling/reinstalling, and attempting to boot to Safe Mode all pull up the same result.

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Another note I'd like to add: I'm not running any third-party antivirus at the moment.

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1) Have you tried performing some of the common solutions here? Troubleshoot Firefox crashes (closing or quitting unexpectedly)

2) Is FF process running within the background even though the window does not render? You can check if the process is still running in Task Manager.

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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}

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I've attempted both of these solutions, and neither worked. I'm still unable to open Firefox, and refreshing/reinstalling still does nothing.

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I suggest posting your latest crash report ID here so we can better understand what's happening.

Since you can't open Firefox to view crash reports, you'll have use the following method. Viewing Crash Reports Outside of Firefox

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strafy said

I suggest posting your latest crash report ID here so we can better understand what's happening. Since you can't open Firefox to view crash reports, you'll have use the following method. Viewing Crash Reports Outside of Firefox

I don't have the correct subfolders in my \AppData\Roaming\Mozilla\Firefox\Crash Reports directory. I only have two files and one folder. The folder is named "events", and the files are named "InstallTime20210310152336" and "InstallTime20210318103112".

EDIT: It may be important to note that the "events" folder is empty.

Okulungisiwe ngu Creepster217

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There are no crash reports in my Crash Reports folder in my AppData Firefox folder.There are two files, both named similarly named "InstallTime" with differing numbers at the end and an empty folder named "events".

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Perhaps your FF isn't crashing at all.

I've found a previous answer that may help. In the solution, try method #2 specified by jscher2000. Firefox launches but there is no window visible - Windows 10

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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 and 2019":

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strafy said

Perhaps your FF isn't crashing at all. I've found a previous answer that may help. In the solution, try method #2 specified by jscher2000. Firefox launches but there is no window visible - Windows 10

The window is visible for a fraction of a second as a white box before closing immediately. Attempting the provided solution had no effect. I can't record a video to show because i have no screen recording software other than the built in Game Bar, and can't take an image because it's both too unreliable and the window, as mentioned above, only appears for a fraction of a second.

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cor-el said

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 and 2019":

I've never had issues with anything else that uses C++ (that I'm aware of), and VCRUNTIME140_1 is present.

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