Can I manually access, and set-up, a profile outside of the browser?

I set up a proxy in the browser using an address from a proxy list website and right after I did that it crashed every time I tried to open the browser. I searched on Chrome, trying to find a way to manually access my settings outside of the browser since I couldn't even get in to the browser, and I was directed to my profile. No website said how to alter the settings but they did say my settings were contained in the profiles. I thought to myself, "Since all my settings are in that profile, deleting it and reinstalling Firefox should fix it." It unfortunately didn't and now I have absolutely no way to make a new profile and every time I try to open Firefox it says I have an instance of the application running already.

Hi,
Please try '''firefox -p -no-remote''' in the '''Start''' > '''Run''' box (or press windows key + '''R''' if the Run box is not present), delete all the profiles with the files in it and create a new one. Please also see [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder & Files] and [https://support.mozilla.com/en-US/kb/Backing%20up%20your%20information?s=backup&r=1&as=s Backup.]
Useful links:
[https://support.mozilla.com/en-US/kb/Options%20window All about Tools > Options]
[http://kb.mozillazine.org/About:config Going beyond Tools > Options - about:config]
[http://kb.mozillazine.org/About:config_entries about:config Entries]
[https://addons.mozilla.org/en-US/firefox/addon/whats-that-preference/ What's That Preference? add-on] - Quickly decode about:config entries - After installation, go inside about:config, right-click any preference, enable (tick) MozillaZine Results to Panel and again right-click a pref and choose MozillaZine Reference to begin with.
[https://support.mozilla.com/en-US/kb/Keyboard%20shortcuts Keyboard Shortcuts]
[https://support.mozilla.com/en-US/kb/Viewing%20video%20in%20Firefox%20without%20a%20plugin Viewing video in Firefox without a plugin]
[http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder & Files]
[https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode]
[https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting Basic Troubleshooting]
[http://kb.mozillazine.org/Problematic_extensions Problematic Extensions]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes]
[http://kb.mozillazine.org/Testing_plugins Testing Plugins]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins Troubleshooting Plugins]

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