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.jar files are downloaded as .rar files

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the topic tells everything, but if you wanna know more I want to download mods for Minecraft which are in a .jar files. but when I download it I get a .rar file and I need to change it every time, how can I make it just be .jar when its downloading

the topic tells everything, but if you wanna know more I want to download mods for Minecraft which are in a .jar files. but when I download it I get a .rar file and I need to change it every time, how can I make it just be .jar when its downloading

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How are you doing the download? Are you using a download manager?

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

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You can rename/remove handlers.json and delete mimeTypes.rdf if present in the Firefox profile folder with Firefox closed to reset all file actions.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.