Firefox Nightly-blocking websites that can be accessed by Firefox

[Cletus]

Gave up on Nightly as a number of websites show as can't connect due to website config., etc. Then I switch to Firefox regular browser and those same sites come up with no issue when selected. Switched to a non Mozilla browser. May go back to Nightly full time if/when that issue is corrected.

[siffemcon]

Nightly is experimental and unstable and should be used only by those who want to report bugs. Why are you using it? You'd rather use a non-FF browser instead of FF release doesn't make any sense to me.

[Cletus]

To expound further, I use nightly due to the features that aren't available in standard Firefox. I'm no computer wizard and prefer to stay with one browser during a session on the computer which means I access some websites regardless of the browser. So, if Firefox and Nightly receive the same data from a given website, why is access to the website blocked in Nightly (secure connection failed) and readily access in Firefox? 

[siffemcon]

OK. Are there any differences in the DNS/proxy/Enhanced Tracking Protection settings? Can you give me the URL of a site which works on release but secure connection fails on nightly?