Facebook and YouTube come across only as 'wingdings' on Firefox 56.0.2 all other sites work.
only these two sites don't work. I have tried the about:config and removing the br solution, which does work, but it distorts other pages when I do that, so I'd prefer a different solution if one can figure it out, since that prevents other sites from working correctly or displaying correctly. I do not have any ad-aware or web companion or any such add on program.
Chosen solution
Hmm, I don't know. Usually if I search for an issuer name there are a few matches on the web, but I don't see any exact matches. Also, I think Microsoft is savvy to Brotli compression, and it's more likely to be a minor vendor or, regrettably, malware.
Could you investigate:
(1) Open the Windows Control Panel, Uninstall a Program.
After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help surface undisclosed bundle items that snuck in with some software you agreed to install. Be suspicious of everything you do not recognize/remember, as malware often uses important or innocent sounding names to discourage you from removing it.
Take out as much trash as possible here. If you're not sure, feel free to post program names or a screenshot of the list.
(2) You can search for remaining issues with the scanning/cleaning tools listed in the previously mentioned support article: Troubleshoot Firefox issues caused by malware. These on-demand scanners are free and take considerable time to run. If they finish quickly and especially if they require payment, you may have a serious infection. I suggest the specialized forums listed in the article in that case.
Hopefully that will flush anything on your system that does not belong.
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What security software do you have?
Some (security) software intercepts a secure connection to scan the content and may not know about this encoding and changes the content-type header to text/plain. This causes Firefox to display compressed content as gibberish instead of rendering the decompressed content. You can check the issuer of the certificate to see what software is interfering with the connection and places itself as a "man in the middle" between Firefox and the web server. If the issuer of the certificate is your security software then make sure to have the latest updates and possibly contact them for support.
See the Security tab in the Network Monitor.
okay I opened up Facebook, and used that tool. the issuer of the security certificate is MS-MNSecurity. which to me seems like microsoft itself, as I am guessing that's what the MS in there is for. other then that I don't know what to look for.
Chosen Solution
Hmm, I don't know. Usually if I search for an issuer name there are a few matches on the web, but I don't see any exact matches. Also, I think Microsoft is savvy to Brotli compression, and it's more likely to be a minor vendor or, regrettably, malware.
Could you investigate:
(1) Open the Windows Control Panel, Uninstall a Program.
After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help surface undisclosed bundle items that snuck in with some software you agreed to install. Be suspicious of everything you do not recognize/remember, as malware often uses important or innocent sounding names to discourage you from removing it.
Take out as much trash as possible here. If you're not sure, feel free to post program names or a screenshot of the list.
(2) You can search for remaining issues with the scanning/cleaning tools listed in the previously mentioned support article: Troubleshoot Firefox issues caused by malware. These on-demand scanners are free and take considerable time to run. If they finish quickly and especially if they require payment, you may have a serious infection. I suggest the specialized forums listed in the article in that case.
Hopefully that will flush anything on your system that does not belong.