To give the simplest example. My index.html file linked to a default.css file in a ‘styles’ folder, which was a subfolder of my public folder (where index.html was). suddenly the link started throwing a 404. This was true for the 4 script files linked to by that file as well. When i move all the resources into the root of the public folder and edit the links in the page, everything works. Beats me what could have cause Firebase to loose track of any folder outside ‘public’.