Firefox about:config

[Andy]

To disable address bar from showing a drop down with suggestions:

browser.urlbar.maxRichResults -> Default is 10 set to 0

 

[Andy]

To disable the expanding address box when you click into it.

ui.prefersReducedMotion -> Default is 0 set to 1

 

[Andy]

browser.menu.showViewImageInfo

Set to True and it will add the "View Image Info" option when you right-click an image.