Product Firefox Release Channel release Version 71.0 Build ID 20191202093317 (2019-12-02) Buildhub data OS Windows 10 OS Version 10.0.18363

bp-acb5e759-cf3c-4d14-a1dc-d054b0191219 Signature: Microsoft::Resources::BaseFile::ValidateStructure

Startup Crash - True

Crash Reason EXCEPTION_IN_PAGE_ERROR_READ / 0xc000a2a7

Let’s do a full clean re-install;

Note: Firefox comes in three or more folders on all computers. They are;

Maintenance: (Programs Folder) <Windows Only> Firefox itself: (Programs Folder) And two folders in the profile of each user on the computer for each Firefox profile for that user.

If you remove the Firefox folder, the user profiles would not be affected.

Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86) Note: Check Both Folders

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any Mozilla or Firefox program folders. Do not remove the Mozilla Thunderbird folder if there is one.

Do Not remove any profile folders.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

Hi FredMcD, thank you for responding. Sorry for the delay in replying, I've been occupied elsewhere.

This is a PC running Windows 10 v1909. It had various problems (including this problem with Firefox) that I tried to fix by performing an in-place upgrade of Windows. This was partly successful, but I'm left with this Firefox problem.

So I've tried uninstalling, removing everything related to Firefox that I can find in the program folders, ProgramData, the user profile folders and the registry, then re-installing using the installer from the link that you suggested, and it still crashes on start-up, including in safe mode. The latest crash report is bp-5887ab0-9fa3-4076-a71e-222d60191222.

I am wondering if there is still something wrong with the Windows 10 installation and if so, what it is and how I might fix it without doing a clean installation of Windows.

The crash report number is not correct. Please try again.

There needs to be a leading 'b' added to the crash ID. That is a crash report with the same signature.

• bp-b5887ab0-9fa3-4076-a71e-222d60191222
• Firefox 71.0 Crash Report [@ Microsoft::Resources::BaseFile::ValidateStructure ]

This is still a problem with MRM (Messaging records management; mrmcorer.dll), but I'm not familiar with this Windows component.

Sorry guys, transcription error. Here are the latest crash reports copied/pasted from the \CrashReports\Submitted folder:

Crash ID: bp-bde26e24-c07f-4505-a818-e308f0191222

Crash ID: bp-e701e01f-0b92-4512-a974-942970191222

Crash ID: bp-b5887ab0-9fa3-4076-a71e-222d60191222

Crash ID: bp-e4cb47a5-e5da-488b-b1c1-8f64d0191222

Product Firefox Release Channel release Version 71.0 Build ID 20191202093317 (2019-12-02) Buildhub data OS Windows 10 OS Version 10.0.18363

bp-bde26e24-c07f-4505-a818-e308f0191222 bp-e701e01f-0b92-4512-a974-942970191222 bp-b5887ab0-9fa3-4076-a71e-222d60191222

Signature: Microsoft::Resources::BaseFile::ValidateStructure

Startup Crash True

Crash Reason EXCEPTION_IN_PAGE_ERROR_READ / 0xc000a2a7

Perform a System File Check to fix corrupted system files

Win 7, 8, 10, Vista: https://support.microsoft.com/en-us/kb/929833 Win XP: https://answers.microsoft.com/en-us/windows/forum/all/windows-xp-scan-and-fix-disk-errors/6fe2827a-4be6-4bc1-8083-5139b5aa3a3d

Wiki - Windows 10 System File Check http://answers.microsoft.com/en-us/windows/wiki/windows_10-update/system-file-check-sfc-scan-and-repair-system-files/bc609315-da1f-4775-812c-695b60477a93

I've run sfc - no integrity violations found - and dism restorehealth - restarted PC, Firefox still crashes on start-up. Unless you guys have any other suggestions, I think that I will have to bite the bullet and rebuild.

Let’s do a full clean re-install;

Note: Firefox comes in three or more folders on all computers. They are;

Maintenance: (Programs Folder) <Windows Only> Firefox itself: (Programs Folder) And two folders in the profile of each user on the computer for each Firefox profile for that user.

If you remove the Firefox folder, the user profiles would not be affected.

Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86) Note: Check Both Folders

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any Mozilla or Firefox program folders. Do not remove the Mozilla Thunderbird folder if there is one.

Do Not remove any profile folders.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

Thanks FredMcD, but I already did that twice. I've now worked round the problem by factory resetting the PC (it's a Dell). I brought Windows up to date and now Firefox has installed and run with no problems. Merry Christmas!

That was very good work. Well Done.

Thank you FredMcD, although to me, resorting to a rebuild is rather an admission of defeat. Still, needs must - clearly there was some sort of Windows corruption, and so better to wipe the slate clean.