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Default htm / html file association W10

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I've used FF forever. I am using W10 / x64. Recently - like in the last several weeks - the default file associations in W10 will not stay set to FF for htm and html files. The associations are changed, automatically, to MS Edge. I often save web pages with the extension SingleFile for later viewing or sharing. I've tried everything possible that I've been able to find including messing with the registry and xml files. FF is my default browser. This is driving me nuts as I don't really use Edge. I'd uninstall the damn thing but I'm sure it would crash the OS. Any thoughts?

I've used FF forever. I am using W10 / x64. Recently - like in the last several weeks - the default file associations in W10 will not stay set to FF for htm and html files. The associations are changed, automatically, to MS Edge. I often save web pages with the extension SingleFile for later viewing or sharing. I've tried everything possible that I've been able to find including messing with the registry and xml files. FF is my default browser. This is driving me nuts as I don't really use Edge. I'd uninstall the damn thing but I'm sure it would crash the OS. Any thoughts?

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Does Edge have a setting to renew file associations, that could be turned off?

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I wish. In W10 you can go to a settings page and assign default applications by file type. I picked FF for HTM / HTML file types. The problem is W10 or Edge resets those back to Edge. Then you have to reset them manually and back and forth you go. No way to keep it permanently assigned. That's why I'm asking if anybody knows a way to do this. It's bothering me enough that I'd like to uninstall Edge but that appears impossible as well. I'll probably, when W10 expires in 2025, move to either Linux or Mac. Don't want to but I'm tired of this stupid game with MS.