Recently I have been having trouble with my steam launcher and the steam website. It has been appearing looking like HTML coding that hasn't loaded fully(attached picture). I have uninstalled and reinstalled, cleared web browser cache, restarted my router, etc. I have found out that my internet is the reason for it, but I do not know what is blocking it from loading. I've gone through all settings in Xfinity Xfi programs. If anyone could help to fix this. Its been going on for awhle now.
Figured out the issue. They recently did an update to Xfinity XFi and it re-set everyone's Protected Browsing to ON.
To turn this off, Log into your Xfinity Account.
Click on the "WiFi" symbol at the top right of the page near your name. (Or go to https://internet.xfinity.com)
Then click on "More". (Or https://internet.xfinity.com/more)
Then under "Security Settings" turn "Protected Browsing" to OFF.
This fixed this issue for me and my Steam Store page is now working properly.
Hope this helps!