User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:66.0) Gecko/20100101 Firefox/66.0
Steps to reproduce:
cdm.link and synthtopia.com
while in private browsing mode, eventually the site starts to return a blank page.
behaviour occurs in Firefox Quantum 66.0 (64-bit)
workaround is to close private browsing mode and open it again
about:config -> set browser.chrome.site_icons = false
page works once or twice but then fails to load.
maybe there is a problem with caching in private mode.
in both cases the console indicates that favicon was not loaded properly
[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIContentSniffer.getMIMETypeFromContent]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: resource:///modules/FaviconLoader.jsm :: onStopRequest :: line 230" data: no]
I have ublock-origin loaded but I don't think that should be a problem.
page should display normally in private browsing mode without having to disable favicons