I can't seem to be able to get into the chrome of firefox. Steps I've followed: - copied the whole "Mozilla Firefox" to a new location I'll refer to in the following lines - creation of a test-only profile "temp" - setting the environment variable MOZ_NO_REMOTE to 1 - changed chrome/browser.manifest to: content branding browser/content/branding content browser browser/content/browser overlay chrome://global/content/viewSource.xul chrome://browser/content/viewSourceOverlay.xul overlay chrome://global/content/viewPartialSource.xul chrome://browser/content/viewSourceOverlay.xul overlay chrome://browser/content/pageInfo.xul chrome://pippki/content/PageInfoOverlay.xul EOF - unzipped browser.jar into the subfolder chrome/browser/, so I've ended with the folder chrome/browser/content/browser/ Yet, firefox still attempts to open browser.jar, ending with this error: "Firefox can't find the file at file:///E:/code/refactory/Mozilla Firefox/chrome/browser.jar!/content/browser/browser.xul.". What am I missind ?