This error has nothing to do with jreviews. The developer of jreviews says:
"Not sure how this relates to JReviews, when you JReviews is not loading jQuery and when it does, it loads it through Joomla, not directly, and from this path https://demo-staging.jreviews.com/media/jui/js/jquery.min.js .It never loads jQuery from the Google CDN. A javascript error like this one would not result in an entire page not loading. To me that issue is completely unrelated. You can go ahead and edit your template and force it to load jQuery from HTTP from whatever source you like and that won't prevent the site from loading. it will just trigger the broken lock on the browser."
So it is really a mystery to me what the cause can be. Easydiscuss is also not possible since the problem was already there before installing easydiscuss.
Regards