I installed LibreElec today to see if it would work better than OpenElec.
Well not quite.
The Chromium plugin has an issue in both.
In LibreElec the plugin uses Chromium V.53 that has the symantec cert issue. Therefore https to many websites doesn't work such as amazon.
A fix would be to use Chromium 55.
I tried using browser.chromium-8.0.104.zip as suggested by lrusak LibreELEC but it did not install with LibreElec 7.03.
I hope the repo can be updated soon with Chromium 55.