How were we aware of the problem?
Crash reports. Firefox crashes anywhere from 1-4 times when starting up with ExplorerPatcher installed on the computer. This affects even a clean install of Firefox - tested it on a computer I completely reformatted & reinstalled Windows on. Firefox worked normally until ExplorerPatcher was installed.
What is a suspicious product causing the problem?
ExplorerPatcher, specifically ExplorerPatcher.amd64.dll - on my Intel laptop, deleting this DLL completely resolves the issue. Simply blocking the DLL in Firefox will fix the issue. I'm unable to do this on my AMD desktop without breaking ExplorerPatcher.
Is the product downloadable? If so, do we have a local repro?
Yes, from here:
Which OS versions does the problem occur on?
Windows 11, seems to have affected 22H2 onward but may also be affecting 21H2 (I don't have it available to test with). Here's the Windows build info I'm using for both my Intel laptop & AMD desktop:
Edition Windows 11 Pro (*this is Windows 11 Home on the Intel laptop)
Installed on 2022-10-04
OS build 22621.755
Experience Windows Feature Experience Pack 1000.22636.1000.0
Which process types does the problem occur on?
I'm not sure how to answer this question, I can check it out if needed but please let me know how to figure it out.
What is the maximum version of the module in the crash reports?
I'm also not familiar with how to answer this one.
Is the issue fixed by a newer version of the product?
Issue persists even on the latest versions of Firefox (stable) and ExplorerPatcher.
Do we have data about the module in the third-party-module ping?
If this information isn't in the crash report and I need to provide it, please let me know how to find it.
Do we know how the module is loaded?
Seems to be being loaded through explorerframe.dll?
Describe your conclusion.
I believe blocking ExplorerPatcher.amd64.dll from Firefox will resolve the issue. If compatibility can be added, that would be great - but ExplorerPatcher just adds some convenience into Windows 11 File Explorer so it shouldn't have any effect on Firefox whether it's loaded or blocked.