sites.google.com

[kpanos777]

All bookmarks for sites under "sites.google.com/" are displayed faulty as errors.
It seems that the host blocks BO requests and returns false error.

[BUZZARDGTA]

Hello, this error is due to this line:
https://github.com/cadeyrn/bookmarks-organizer/blob/master/src/js/core/background.js#L634

It causes this to happen in the dev console errors:
The resource at “https://sites.google.com/site/[URL_PATH_HERE]” was blocked due to its Cross-Origin-Resource-Policy header (or lack thereof). See https://developer.mozilla.org/docs/Web/HTTP/Cross-Origin_Resource_Policy_(CORP)#

You can remove that line I have showed off the link above, and it will works fine.

I have no ideas what that line is used for, we will now wait for @cadeyrn to reply, with he's knowledge.