Did you ever find out what this error was from your IT dept. or ESRI? We're experiencing the exact same thing (IE works, FF & Chrome do not - same error) nearly 4 years later, thanks!
aug_aug do you have a public url to your app that you can share so we can take a look?
Hi Kelly - I don't, actually everything's behind our firewall. I just commented here because this is the same exact behaviour we're seeing and I was curious, it started on Monday, previous Friday everything was fine. Our IT dept. indicated that they applied an MS/Windows patch on Fri., I looked and the patch affects IE and Windows Server 2012, possibly that has something to do with it? Not sure, but FF/Chrome started throwing same error "Unable to load //xyz.xyz.com/portal/sharing/rest/portals/self?f=json&dojo.preventCache=1483641xxx790 status: 0" however IE still works.
Getting error on chrome
Unable to load https://*********:7443/arcgis/sharing/rest/content/items/700f40e612ee4c6c86bfc3f69cedc54b/data?f=json&token=aVtIV0YXKzi-7DMNdwqfcBVq6xL-h956RvMv82sfjFJpFadACgq8ngGyoKzJLQHEOo7EWS7m9EEc3Ko5fQ9yPb432p0L03bbPtuc3K9xefNryf-1U-23UUd-nXYc9zbUkFfVtfgXy3Ie0o3igA043P5Y5dohJEAXTJjUHDqIIIHnmP7PdRnnX1mAQN8XKcvG status: 0
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