Cannot download - missing browser.download.dir, browser.download.downloadDir, and browser.download.lastDir in about:config - how do I get them back?

I have been unable to download anything using Firefox. I went through all the steps suggested in Firefox support, but nothing works. I am missing the following files:
browser.download.dir
browser.download.downloadDir
browser.download.lastDir

I see an IDM FlashPlugin extension in your above posted More system details list.
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]

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