After uninstalling Firefox (32 bit) and installing (64 bit), registry has fragments referencing the old 32 bit executable location.
Because of problems with FF, uninstalled and reinstalled it. (Turns out the problem was with 0Patch, not FF.) The old version was 32 bit, the new one 64 bit. But there are many references (75 of them) in registry to Program Files (x86)\Mozilla Firefox\Firefox.exe. Is it safe to delete them? (I am comfortable working with the registry.)
Chosen solution
Do these entries have a corresponding key in the registry for the 64-bit Firefox version, so you can possibly do a comparison ?
If those 32-bit keys link to files that are no longer present on the hard drive then it should be safe to remove. You can still export the keys just to be safe.
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Sometimes, program uninstallation entries are not properly removed¹. Don't click them, or you'll end up uninstalling the current version of Firefox.
You can manually remove such entries from the registry. To launch the registry editor, click the Windows search icom on the taskbar, then in the search box type regedit.exe and press Enter. Exercise caution when using the registry editor; you may want to back up the parent key first by right-clicking it and choosing Export.
For example, the uninstallation entry for the current version, English (US) locale can be found in the following locations:
- 32-bit Windows:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mozilla Firefox 73.0.1 (x86 en-US)
- 64-bit Windows:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Mozilla Firefox 73.0.1 (x86 en-US)
The left over registry items are NOT installation entries like you cite. Here is an example:
HKCU\Software\Mozilla\Firefox\Launcher C:\Program Files (x86)\Mozilla Firefox\firefox.exe|Launcher REG_QWORD 00000020A545BD04 2/25/2020 4:44:59 PM 8
Chosen Solution
Do these entries have a corresponding key in the registry for the 64-bit Firefox version, so you can possibly do a comparison ?
If those 32-bit keys link to files that are no longer present on the hard drive then it should be safe to remove. You can still export the keys just to be safe.