Using the new Arduino IDE for ESP8266 and found bugs, report them here

Moderator: igrr

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By schufti
#91457 sorry for all the trouble, didn't realize it is only a template where the actual urls are missing.
I was using a manual edited version that worked, try using this url ... index.json

in settings (or preferences.txt) until 3.0.1 gets published

but to be honest: 3.0.0 breaks so many things that I don't know why someone would voluntarily "upgrade", at least wait for 3.0.1 for worst flaws to be fixed.
if you don't believe me, have a look over at github issues. As not even installation works correct, what else to say ...