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":
Download the latest vc_redist.x64 and vc_redist.x86 files.
You need to reboot the computer.
Try to start Firefox in Troubleshoot Mode to see if that works.
- Windows: hold down the Shift key while starting Firefox
- Mac: hold down the Options key while starting Firefox
You can check the connection settings and check for possible issues with a Proxy or VPN service.
- Settings -> General -> Network: Connection -> Settings
If you do not need to use a Proxy to connect to internet, select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See also:
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
Download the latest vc_redist.x64 and vc_redist.x86 files.
*https://aka.ms/vs/17/release/vc_redist.x64.exe
*https://aka.ms/vs/17/release/vc_redist.x86.exe
You need to reboot the computer.
<hr>
*https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems
Try to start Firefox in <b>Troubleshoot Mode</b> to see if that works.
*Windows: hold down the Shift key while starting Firefox
*Mac: hold down the Options key while starting Firefox
*https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
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You can check the connection settings and check for possible issues with a Proxy or VPN service.
*Settings -> General -> Network: Connection -> Settings
If you do not need to use a Proxy to connect to internet, select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See also:
*https://support.mozilla.org/en-US/kb/connection-settings-firefox
*https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors