Instructions on how to fix one preference that never stays changed leads to dead ends. Please help me figure out what to do next.

Every time I look at Options, my setting always reverts to TELL Sites that I do not want to be tracked. Other people told me not to check anything, so it's a little annoying that it is always checked.
I opened troubleshooting, opened my folders, and discovered that I don't have a User.JS file, so the instructions to fix that preference ended without a solution. The next step to check Pref.JS. Here, I got an error:
prefs.js
line 1
char 1
invalid character
code 800a03f6
Microsoft jscript compilation error.
I have no idea what to do next. Thank you.

You need to right-click the prefs.js file and use "Open with" to open the file in a text editor (e.g. Notepad) and you shouldn't double-click the file as that gives you the above posted error message.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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