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How do I reinstall Firefox FROM SCRATCH when older settings (but not the .exe itself) is still on a Windows PC? Will deleting all entries in Windows Registry fix it?

Background is that I switched Sata cables for some hard drives (for an unrelated experiment), of which one contained the Firefox installation on D:. Then I ran Firefox, and somehow it seemed to work and I also was promted to install an update which I did. After some days I switched back Sata cables. Now I cannot uninstall old instances of Firefox that I can see in Win Settings -> Apps. Worse, I cannot install Firefox anywhere AND also make Firefox running without a crash after a few seconds. To remove all info in registry and hard drives might be the way to solve this?

Followed instructions from the website to install Firefox on my MacBook Air M4. Everything seemed to be as shown in the instructions (How to download and install Firefox on Mac), but Firefox doesn't show up in the Applications folder. No error messages, but no Firefox either. Does anyone have any ideas on this? Is there a way to contact Mozilla for support? Thanks.

When trying to install Firefox 141 on a Win11 computer with no internet access the installer starts going then there is a error pop up saying this version of firefox requires Win10. Is there something that needs done to work around this?