You won't see "Form Data" in developer tools if a file is selected. Omit the file and you'll see the form data fields once again.
Settings -> under System -> disable "Use hardware acceleration"
https://superuser.com/questions/1050906/chrome-pdf-viewer-plugin-not-working/1054043
F12 (open developer console) --> Ctrl + Shift + P --> Disable JavaScript
https://stackoverflow.com/questions/13405383/how-to-disable-javascript-in-chrome-developer-tools
Fn + Shift + Delete
~/Library/Application\ Support/Google/Chrome/Default/Extensions
https://stackoverflow.com/questions/14543896/where-does-chrome-store-extensions